Page 1
MX10B Series
12.5 Gb/s Optical Transmitters
MX40B Series
40 Gb/s Optical Transmitters
User Guide
Page 2
Page 3
MX10B, MX40B Series of Optical Transmitters
Table of Contents
Chapter 1 Introduction .............................................................................................................................................................. 1
1.1 Description ..................................................................................................................................................... 1
1.2 Parts List ........................................................................................................................................................ 1
1.3 Block Diagram................................................................................................................................................ 2
1.4 Front and Back Panel Overview ................................................................................................................... 3
Chapter 2 Safety......................................................................................................................................................................... 5
2.1 Precautions .................................................................................................................................................... 6
Chapter 3 Quick Start Guide ..................................................................................................................................................... 7
3.1 Hardware Set Up ............................................................................................................................................ 7
3.2 Controls on the Home Page .......................................................................................................................... 8
3.3 System Wavelength Setting .......................................................................................................................... 9
3.4 Controls on the Settings Pages .................................................................................................................. 10
Chapter 4 Operating Instructions ........................................................................................................................................... 11
4.1 The Modulator Transmission Function ...................................................................................................... 11
4.2 Control Loop Diagram ................................................................................................................................. 11
4.3 Bias Settings Page ...................................................................................................................................... 12
4.3.1 Quadrature Mode .............................................................................................................................. 13
4.3.2 Peak Mode ........................................................................................................................................ 15
4.3.3 Null Mode .......................................................................................................................................... 15
4.3.4 Manual Mode .................................................................................................................................... 16
4.4 Amplifier Settings Page .............................................................................................................................. 18
4.5 Variable Optical Attenuator Settings Page ................................................................................................ 20
4.6 Laser Settings Page .................................................................................................................................... 21
4.7 Load Page .................................................................................................................................................... 22
4.8 Menu Page .................................................................................................................................................... 23
4.8.1 Display and Sound Settings Page ..................................................................................................... 23
4.8.2 System Information Page .................................................................................................................. 24
4.8.3 Accent LED Settings Page ................................................................................................................ 24
4.8.4 Thorlabs Help Page .......................................................................................................................... 25
Chapter 5 Specifications ......................................................................................................................................................... 26
5.1 General System Specifications .................................................................................................................. 26
5.2 Power and Environmental Specifications ................................................................................................. 27
5.3 Internal Control Specifications ................................................................................................................... 27
5.4 Internal Amplifier Specifications ................................................................................................................ 27
5.5 Internal Modulator Specifications .............................................................................................................. 27
5.6 Laser Specifications .................................................................................................................................... 28
Chapter 6 Control and PC Connections ................................................................................................................................. 29
6.1 General Purpose I/O, RS-232, and USB Connections ............................................................................... 29
6.2 The Laser Safety Interlock .......................................................................................................................... 30
Chapter 7 Mechanical Drawings ............................................................................................................................................. 31
7.1 MX10B Series ............................................................................................................................................... 31
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MX10B, MX40B Series of Optical Transmitters
7.2 MX40B Series ............................................................................................................................................... 32
Chapter 8 Maintenance, Repair, and Fuses ........................................................................................................................... 33
8.1 Maintenance and Repair ............................................................................................................................. 33
8.2 Replacement Parts ...................................................................................................................................... 33
8.3 Replacing the Main Fuse ............................................................................................................................. 34
Chapter 9 Troubleshooting ..................................................................................................................................................... 35
Chapter 10 Declarations of Conformity ......................................................................................................................... 36
Chapter 11 Thorlabs Worldwide Contacts .................................................................................................................... 38
Page 5
MX10B, MX40B Series of Optical Transmitters Chapter 1: Introduction
Chapter 1 Introduction
1.1 Description
Thorlabs' MX10B and MX40B series of reference transmitters are designed for high-speed fiber optic test and measurement
applications. They are fully-integrated and user-configurable solutions based on proven lithium niobate (LiNbO3) modulator
technology driven by high-fidelity digital RF amplifiers. They are designed for digital applications, and the maximum output swing
of their limiting RF amplifiers is user-adjustable. Variable optical attenuators (VOAs) and power monitors enable completely
automatic control and stabilization of the optical output power. Transmitters in the MX10B series include an external loop-back
cable for the driver RF output and modulator RF input ports, which provides the opportunity to use an external driver, if desired.
The MX10B/MX40B, MX10B-LB/MX40B-LB, and MX10B-1310/MX40B-1310 include a tunable C-band laser, a tunable L-band
laser, and a 1310 nm fixed-wavelength laser, respectively. Both the C- and L-band laser sources are tunable on the ITU 50 GHz
grid and include a dither feature for wavelength stabilization. An external laser source, operating from 1250 nm to 1610 nm, can
also be used with all models to provide the optical input.
These instruments can be controlled in two ways. The simplest method is directly via the built-in graphical user interface (GUI)
and touchscreen. The instrument can also be operated remotely via the RS-232 or USB ports on the back panel. Remote control
is enabled using simple SCPI-type serial commands from a PC. See the remote control user guide (RCUG), which can be
downloaded from https://www.thorlabs.com/manuals.cfm, for details.
The most recent firmware and remote control software tools can be downloaded by visiting
https://www.thorlabs.com/navigation.cfm?Guide_ID=2191 and entering the Item # into the search field. Thorlabs’ technical
support can provide up-to-date information on available firmware revisions and control functions.
NOTE: This manual covers both the MX10B and MX40B series of models, as their architectures are very similar. Their
differences are clearly noted in the following sections.
1.2 Parts List
Inspect the shipping container for damage. If the shipping container seems to be damaged, keep it until you have inspected the
contents and tested the unit mechanically and electrically. Verify that you have received the following items within the package:
1. MX10B or MX40B Series Optical Transmitter Main Unit
2. Power Cord According to Local Power Supply
3. PM Loopback Fiber Optic Cable
4. SMA Loopback RF Cable (not required for MX40B series)
5. Interlock Keys
6. 2.5 mm Interlock Pin (in back panel)
7. 1.25 A 250 VAC Fuse
8. USB Type A to Type B Cable, 6' Long
Rev. D, March 19, 2019 Page 1
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MX10B, MX40B Series of Optical Transmitters Chapter 1: Introduction
1.3 Block Diagram
These instruments are fully integrated and contain both the laser source and the intensity modulator. The modulator is a MachZehnder configuration and will often be referred to as the MZM. All the user needs to supply is the signal source to the Amplifier
RF In port. The user can choose to use the internal laser source (via loop-back fiber) or an external laser source of their own.
The Laser In port uses PM fiber with light linearly polarized along the slow axis as shown on the front panel. Maximum input
power is 20 dBm (100 mW). In the MX10B series of transmitters, the user also has the option of using their own modulator driver
connected to the Modulator RF In port. The MX40B series does not have this option in order to preserve signal integrity. Optical
power is monitored in three places (Mon-1,-2,-3) for the purpose of enabling bias and power control. These power values are
also available at the I/O port. Mon-1 is at the Laser Input, Mon-2 is at the MZM Output, and Mon-3 is at the final Optical Output.
Figure 1 Block Diagram of the MX10B and MX40B Series
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MX10B, MX40B Series of Optical Transmitters Chapter 1: Introduction
1.4 Front and Back Panel Overview
A
E
F
B
G
Figure 2 Front Panel
C
D
M
L
J
K
Callout Description MX10B Series MX40B Series
A
B
C
D
E
F
G
J
K
L
M
Touchscreen Display - -
Key Switch and Indicator
Lasing Disabled; Lasing
Grounding Jack (Banana
Amplifier RF Output SMA Not Available
Modulator RF Input SMA Not Available
Amplifier RF Input SMA 2.92 mm
Adjustment Knob - -
- -
Enabled
Connector)
Earth Ground
Laser Output PM FC/PC PM FC/PC
Laser Input PM FC/PC PM FC/PC
Optical Output FC/PC FC/PC
Standby Button - -
Banana Banana
Rev. D, March 19, 2019 Page 3
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MX10B, MX40B Series of Optical Transmitters Chapter 1: Introduction
O
N
R
S
P
Q
T
Figure 3 Back Panel
U
Callout Description MX10B Series MX40B Series
N
O
P
Q
R
S
T
U
Supply On; Supply Off
I/O Port DB-15 DB-15
Option Label - -
RS-232 Port DB-9 DB-9
USB Port, Type B - -
Laser Interlock 2.5 mm 2.5 mm
Power Connector - -
Fuse Tray - -
Power Switch
- -
Page 4 TTN048897-D02
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MX10B, MX40B Series of Optical Transmitters Chapter 2: Safety
Chapter 2 Safety
All statements regarding safety of operation and technical data in this instruction manual will only apply when the unit is operated
correctly. If equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired. Only with written consent from Thorlabs may changes to single components be carried out or components not supplied
by Thorlabs be used.
Warning: Risk of Electrical Shock
Before applying power to the instrument, make sure that the protective conductor of the 3 conductor mains power
cord is correctly connected to the protective earth contact of the socket outlet. Improper grounding can cause electric
shock with damage to your health or even death. The local supply voltage must be in the range specified on the back
panel, and the correct fuse must be installed in the fuse holder. If not, please replace the main fuse (see section on
instrument maintenance). Only use mains cable with sufficient current and voltage ratings for this instrument. Do not
position equipment in a way that makes it difficult for the user to operate the disconnecting device. Do not remove
covers. Refer servicing to qualified personnel.
Warning: Risk of Explosion
The instrument must not be operated in explosion endangered environments.
Warning: Laser Radiation
Avoid Exposure – Radiation emitted from apertures. Do not look into the laser
aperture while the laser is on. Injury to the eye may result. Laser should not be turned
on unless there is an optical fiber connected to the laser output port.
Caution – Use of controls or adjustments or performance of procedures other than
those specified herein may result in hazardous radiation exposure.
LASER RADIATION
DO NOT VIEW DIRECTLY WITH
OPTICAL INSTRUMENTS
CLASS 1M LASER PRODUCT
Caution: ESD Sensitive Component
The components inside this instrument are ESD sensitive. Take all appropriate precautions to discharge personnel
and equipment before making any connections to the unit. A front panel grounding jack is provided for connection to
a wrist strap.
Caution: Components not Water Resistant
This instrument should be kept clear of environments where liquid spills or condensing moisture are likely. It is not
water resistant. To avoid damage to the instrument, do not expose it to spray, liquids, or solvents.
Caution: Follow Intended Usage Guidelines
This product is not suitable for household room illumination.
Inputs and outputs must only be connected with shielded connection cables.
Do not obstruct the air ventilation slots in housing.
Mobile telephones, cellular phones or other radio transmitters are not to be used within the range of three meters of
this unit since the electromagnetic field intensity may then exceed the maximum allowed disturbance values according
to IEC 61326-1.
Rev. D, March 19, 2019 Page 5
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MX10B, MX40B Series of Optical Transmitters Chapter 2: Safety
2.1 Precautions
The following statement applies to the products covered in this manual, unless otherwise specified herein. The statement for
other products will appear in the accompanying documentation.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules and meets all requirements of the Canadian Interference Causing Equipment Standard ICES-003 for digital
apparatus. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not
occur in a particular installation.
This product has been tested and found to comply with the limits according to IEC 61326-1 for using connection cables shorter
than 3 meters (9.8 feet).
Thorlabs is not responsible for any radio television interference caused by modifications of this equipment or the substitution or
attachment of connecting cables and equipment other than those specified by Thorlabs. The correction of interference caused
by such unauthorized modification, substitution or attachment will be the responsibility of the user. The use of shielded I/O cables
is required when connecting this equipment to any and all optional peripheral or host devices. Failure to do so may violate FCC
and ICES rules.
This precision device should only be shipped if packed into the complete original packaging including the custom cut foam
padding. If necessary, ask for replacement packing material.
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MX10B, MX40B Series of Optical Transmitters Chapter 3: Quick Start Guide
Chapter 3 Quick Start Guide
3.1 Hardware Set Up
For first use, plug the main power cable into the back panel connector, and then plug the other end into an AC wall
receptacle. Flip the power switch on the back panel to the ON (I) position. The unit will now be in the “Standby” mode,
and the front panel standby button should glow amber.
Figure 4 Power Cable Port, Fuse, and Power
Switch
Attach the polarization-maintaining (PM) loopback fiber optic cable between the Laser Out and Laser In PC/FC connectors on
the front panel. Be sure to clean both ends of the fiber as described in the Maintenance Section of this manual. For the MX10B
series: attach the SMA loopback RF cable between the Amplifier RF Out and Modulator RF In SMA connectors on the front
panel. (This instruction does not apply to the MX40B series, as it does not have an Amplifier RF Out port.)
Figure 6 PM Loopback Fiber Cable Installed
Insert the key into the interlock switch and turn it towards the unlock symbol ( ). This allows the laser to be turned on, but the
LASER ON indicator will not glow green until the laser is actually turned on by the touchscreen button. Turn on the unit by
pressing the amber standby button on the front panel which will then turn green to indicate the unit is fully on. The touchscreen
display will come up with a boot screen for about 5 seconds and then go to the home page. The unit will initialize in the factory
default state with all functions OFF.
Figure 5 Indicator Glows Amber when Instrument
is In Standby
Figure 7 Amplifier RF Out present only on the
MX10B series of transmitters. This cable is not
installed on the MX40B transmitter series.
Figure 8 Interlock Key Switch
Rev. D, March 19, 2019 Page 7
Figure 9 Indicator Glows Green when Instrument is
Fully Enabled
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MX10B, MX40B Series of Optical Transmitters Chapter 3: Quick Start Guide
3.2 Controls on the Home Page
The MX10B and MX40B series of transmitters can be fully controlled by using the resistive touchscreen display for all functions.
The screen is sensitive to the touch of a finger or a plastic stylus, and selections are made by tapping the on-screen button of
interest. In addition, the knob on the front panel can be used in place of the on-screen arrow buttons for quickly changing setpoint values. Pressing (clicking) the knob will confirm a new set-point value.
Tap these buttons
to turn functions
ON or OFF
Tap in these areas
to go to the related
Settings pages.
Figure 10 Home Screen Features
The Home screen (or dashboard) is organized into three main sections.
The left side contains the ON/OFF buttons for each of the main instrument functions. Tapping any of these buttons will toggle
the function on and off. The same ON/OFF functionality is also available on the individual Settings pages. The power buttons
turn green to indicate the function is ON, and turn red to indicate the function is disabled.
The central section is the main dashboard for reporting operational values of each section. Tapping the screen in this middle
area will take the user to the corresponding Settings page for each section. Note that the green dot in each of these sections
indicates the function is stable. A blinking green dot indicates the function is still stabilizing.
Blue Button:
Utility Functions
Green Dot:
Stability Indicator
Power units (dBm or
mW) are set in the
VOA Settings page.
The right side of the screen provides access to the main utility functions of the box.
The screen shot below shows some of the common warning indicators on the HOME page. Some functions can be disabled
when the laser power is low. In this case, buttons may be disabled and warnings indicators may appear.
Low Power
Disabled
Functions
Figure 11 Home Screen Warnings and Indicators
Warnings
Interlock
Warning
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MX10B, MX40B Series of Optical Transmitters Chapter 3: Quick Start Guide
3.3 System Wavelength Setting
The operational wavelength range of the MX10B and MX40B series extends from 1250 nm to 1610 nm. The three calibration
wavelengths of the power monitors, 1310 nm, 1550 nm, and 1590 nm, represent the centers of the O-band, C-band, and L-band
and provide the user with accurate power readings at or near those wavelengths.
The system wavelength should always be set to the wavelength closest to that of the laser source coupled to the Laser In
bulkhead. The instrument’s system wavelength is factory-preset to correspond to the wavelength band of the integrated laser
source. If an external laser is to be used with the instrument, the system wavelength may need to be changed. This function
exists in the Utility Menu.
From the Home screen, tap the MENU button to bring up the Utility Menu as shown.
Tap the MENU button to
access the Utility Menu.
Figure 12 Accessing the Utility Menu from the Home Screen
Then tap the System Wavelength bar as shown below to bring up the three wavelength choices. Tap the desired wavelength to
set the System Wavelength.
Tap here to activate
wavelength selection.
Choose one of these
wavelengths.
Figure 13 System Wavelength is Selected from the Utility Menu
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MX10B, MX40B Series of Optical Transmitters Chapter 3: Quick Start Guide
3.4 Controls on the Settings Pages
The Settings pages all follow the same general design and functionality as shown in the example screen shot below. The upper
section with white letters displays the parameters that can be changed. Simply tap on the parameter of interest to highlight it,
and the controls for that parameter will be presented.
The lower section with amber letters displays selected values that are convenient to monitor on that page.
The right-hand column provides the controls for changing the values for the selected parameters. The main control knob on the
front panel can also be used to adjust and confirm selected values. The screen shots below show examples of the touch-screen
controls.
Tap to select parameter.
Yellow highlight will appear.
Increase value
Decrease value
Change step size
Confirm new value
Cancel any changes
Monitor area
Figure 14 Controls used to Adjust and Save Values of Selected Parameters
Fields that have adjustable values will show a flag if the minimum or maximum values have been reached. These are set by
firmware at the factory.
MIN / MAX warnings
indicate that the setting
limit for a particular
parameter has been
reached.
Figure 15 MIN and MAX Flags Indicate Bounds of Adjustable Value Ranges
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
Chapter 4 Operating Instructions
4.1 The Modulator Transmission Function
The Mach-Zehnder Modulator (MZM) has a repetitive transmission function with applied voltage as can be seen in the diagram
below. In order for it to work correctly, a DC bias voltage must be applied and maintained at the desired set point. The highfrequency AC signal can then be applied to the modulator to enable the correct optical modulation of the laser beam. The most
common operating points are the peak, null, and quadrature points as shown below.
The purpose of the Bias settings is to hold the modulator at one of these chosen points. Note that a real transmission function
does not go perfectly from 0% to 100%. This is characterized by the Extinction Ratio of the modulator (Peak power / Null power).
The efficiency of the modulator is also characterized by V
from Null to Peak. The most linear response of the modulator is achieved by biasing it at one of the Quadrature points where
the transmission is closest to 50%. Some non-linear, frequency doubling, and phase modulation applications require biasing at
the Null or Peak.
, which is defined as the voltage necessary to change the transmission
π
Figure 16 Illustration of the Modulator Transmission Function
4.2 Control Loop Diagram
The following diagram shows the control loops added to the block diagram. From this picture, the user can see how the power
monitors and VOA are used to provide stability and control to the whole system. It will be helpful to refer to this diagram to gain
a better understanding of the functionality of the unit as described in the upcoming sections of the manual. Note the MX40B
series does not have the external RF loopback.
Figure 17 Control Loops Overlaid on Block Diagram
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
4.3 Bias Settings Page
To get to the Bias Settings page tap the Bias monitors pane on the Home page. The Bias page contains the settings for controlling
the modulator bias and operating modes. There are four modes for MZM bias control: 1) Quadrature, 2) Peak, 3) Null, and 4)
Manual. The screen shot below is an example of how the bias settings page opens up if the controller is in the Quadrature mode.
The blue buttons enable switching between modes.
Tap to select Peak Mode
Tap to select Quadrature Mode
Tap to select Null Mode
Tap to select Manual Mode
Figure 18 Bias Settings Page
Active control of the MZM bias point is essential as the modulator is temperature sensitive and will drift over time. The
Quadrature, Peak, and Null modes use a dither tone as part of a lock-in control scheme to keep the MZM bias stable. The dither
tone allows the control algorithm to track the drifting, but at the cost of decreased signal-to-noise ratio (SNR) due to the injection
of a single frequency tone into the MZM bias.
The first time you turn on the MZM Bias control, the instrument will perform a calibration routine to determine the approximate
bias voltages required for the various MZM operating points. This allows the instrument to quickly and effectively switch between
Bias modes. The user may perform this calibration anytime by pressing the Reset Auto Bias button on the right side of the Bias
Settings page. This button is not available if the Bias is off or in Manual mode.
Tap to turn Bias On/Off
Tap to Reset Modulator Bias
New set points will be stored
Figure 19 Buttons to Manually Initiate Modulator Calibration Routine
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
4.3.1 Quadrature Mode
Quadrature is the default mode and biases the MZM at the 50% point on the MZM transmission curve (see figure). This is the
recommended mode for digital signals such as On-Off-Keying (OOK) that require a high extinction ratio. The screen-shot below
shows the parameters that can be controlled in the Quadrature mode.
Choose one of three preset
Dither Frequencies.
Select your own Dither
Frequency here.
Figure 20 Buttons to Select Preset and Define Custom Dither Frequencies
The bias control circuit uses an AC dither tone to stabilize the bias point of the modulator. The graphic below shows how it works:
Figure 21 Illustration Showing How Dither is Used to Stabilize Modulator Bias Point
A small AC voltage is applied to the DC bias so that the optical output is also slightly modulated. Both the amplitude and the
frequency of AC dither tone can be selected by the user. The modulated optical output is detected by a frequency and phase
sensitive detector which can then interpret whether the DC bias is at the correct level for the chosen set-point (Quad, Peak or
Null). The DC bias voltage is then continuously adjusted to maintain the correct set-point.
The frequency of the dither tone (under 10 kHz) is usually well below the low frequency cut-off for the RF signal of interest, so
it does not interfere. The dither tone can also be turned if other methods of bias control are desired (e.g. manual control, or
input/output ratio control as described later).
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
A
The dither tone frequency may be changed by tapping the Dither Frequency field. Standard frequencies are available on the
blue buttons, or a custom frequency may be chosen by pressing User Define. The dither tone frequency usually has very little
effect on the accuracy of the bias control, but in some cases a different frequency may work better or be desirable depending
on the RF signal applied, or the specific application. The User Define button allows for the selection of an arbitrary frequency
between 1 kHz and 10 kHz with 10 Hz resolution.
djust the Dither Amplitude
from this screen.
Tap here to turn Dither On/Off.
Figure 22 Adjust, Enable, or Disable the Dither Used to Stabilize the Bias Point
The dither tone amplitude can also be adjusted to any amplitude between 20 mV and 2 V with 1 mV resolution. Higher
amplitude will typically be more stable in the presence of MZM drift and broadband RF signals, but larger dither tones also
decrease SNR. If the amplitude is too low, the MZM bias may not stay locked. Typically, a value between 300 mV and 500 mV
is a good starting point.
In applications where the highest SNR is desired, there is also the option to disable the dither tone. This allows the user to
quickly turn the dither off, perform a measurement requiring low noise, and then turn the dither back on. When the dither is
turned off, the bias is simply held at the previous bias voltage. For longer term measurements without dither, you can switch to
Manual Mode and use a constant ratio method for stabilizing the bias point. (See the Manual Mode section.)
Select Positive Slope
Select Negative Slope
Tap here to change Slope.
Figure 23 Locate Bias Point on Positive or Negative Slope
The Quadrature mode also allows the user to select between two operating points by selecting the Slope field. Positive slope is
the non-inverting operating point where increasing voltage on the MZM results in increasing optical output power. Negative
slope is the inverting operating point where increasing voltage on the MZM results in decreasing optical output power. This
effectively changes the phase of the response function.
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
4.3.2 Peak Mode
The Peak Mode adjusts the DC bias voltage so the transmission is centered at a nearby transmission maximum. In this mode
only dither frequency and amplitude settings are available. These controls and settings are the same as previously described
for the Quadrature mode.
Peak and Null modes are often used to obtain phase modulation and non-linear frequency doubling. The optical phase is 180°
shifted on opposite sides of the Null point.
Bias control in Peak mode;
Tap to change.
Tap here to reset the Bias
calibration and return to
Peak mode.
Figure 24 Peak Mode Settings
4.3.3
The Null Mode adjusts the DC bias voltage so the transmission is centered at a nearby transmission minimum. In the Null
mode only dither frequency and amplitude settings are available. These settings are the same as previously described for the
Quadrature mode.
Null Mode
Bias control in Null mode;
Tap to change.
Tap here to reset the Bias
calibration and return to Null
mode.
Figure 25 Null Mode Settings
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
4.3.4 Manual Mode
The Manual mode allows the user to bias the modulator at any point of the transmission function desired. Manual mode offers
two modes of operation: 1) Constant Bias, and 2) Constant Ratio. In both of these modes, the dither function is not active, and
the controller uses different techniques to hold the bias steady.
Bias control in Manual mode;
Tap here to change mode.
Tap here to adjust Bias voltage.
Tap here to select Hold mode:
Constant Bias or Constant Ratio
Figure 26 Constant Bias Manual Mode Settings
Constant Bias is the most basic mode of operation and will apply a user selected DC voltage to the MZM. This can be useful
for performing brief measurements that only take a few minutes. During longer duration experiments, the MZM is more likely
to drift.
The Constant Ratio mode employs active control of the MZM bias, but without using a dither tone. As a result, it can achieve
superior SNR compared to the Quadrature mode. This mode is recommended for analog signals or higher level PulseAmplitude Modulation (PAM) formats.
Constant Ratio works by holding the MZM ratio of input light (at Mon-1) to output light (at Mon-2) at a constant value (typically
at or close to Quadrature). Note that it does NOT take into account the insertion loss of the MZM. Therefore, the user must
have some knowledge of the IL between the Monitors. For example. If the modulator has an IL of 3 dB, then the I/O ratio at
maximum transmission is already 2:1. To bias the modulator at the 50% point, the ratio must be doubled to 4:1. The MZM
insertion loss is listed in the specifications.
Tap here to manually adjust the
modulator transmission ratio in
Constant Ratio mode.
This is the ratio of modulator input
power to output power.
Figure 27 Constant Ratio Manual Modes Settings
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
In the Constant Ratio mode there is an option to select between the two available operating regions by selecting the Slope
field. Positive slope is the non-inverting operating point where increasing voltage on the MZM results in increasing optical
output power. Negative slope is the inverting operating point where increasing voltage on the MZM results in decreasing
optical output power.
Select Positive Slope
Select Negative Slope
Tap here to Change Slope
Figure 28 Selecting Operating Point in Constant Ratio Mode
When switching to one of the Manual modes from a different bias mode, the Manual mode set point is automatically calculated
to keep the MZM at the same location on the transmission function. For example, in order to switch to Constant Ratio mode at
the Quadrature location, follow these steps:
Turn the bias on, and choose Quadrature mode.
Wait for the green indicator dot to stop blinking (indicating the bias is locked at quadrature)
Optional: For greater accuracy at this point, slowly reduce the dither tone amplitude to ~100 mV in order to remove
errors that can occur due to second order effects with a large dither tone. Make sure the green dot is not blinking
Now change the bias mode to Manual and select Constant Ratio.
The instrument will calculate the ratio to keep the MZM biased at the Quadrature location.
From here, the ratio set point can be adjusted to further tune performance.
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
4.4 Amplifier Settings Page
To get to the Amplifier Settings page, tap on the Amplifier monitor pane on the Home page. The Amplifier has a fixed gain that
it applies to a user input signal. The signal is then routed to the RF input port of the MZM via the front panel loop-back cable.
There are two Modes for the amplifier: 1) Digital and 2) Analog, but both work with the same fixed gain. Analog mode simply
sets the output swing of the amplifier to maximum.
Tap here to change modes.
Select Analog mode to
provide maximum output
swing.
Select Digital mode to
enable adjustable
output swing.
Figure 29 Selecting between Analog and Digital Amplifier Settings
The default amplifier mode is Digital, in which case the output swing and crossing point can both be adjusted while the gain is
held constant. This digital mode is recommended for OOK (On-Off Keying) digital signals. The V
conveniently set the Max Output Swing to the optimum value to achieve high extinction modulation with the internal modulator.
Tap here to adjust crossing set
point from -100 to +100.
Tap here to optimize output
swing.
Tap here to adjust maximum
output swing in Digital mode.
Figure 30 Digital Amplifier Mode Settings
The Max Output Swing field allows the user to set the peak-to-peak output voltage of the amplifier, assuming the amplifier input
signal is large enough to cause the amplifier to start clipping. The Max Output Swing essentially controls the output amplitude
at which the amplifier starts clipping. When operating in the digital mode, it is expected the user will supply a signal with sufficient
input amplitude to cause the amplifier to clip.
Swing button is provided to
π
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
A
A
The Crossing Point field allows the user to adjust the eye crossing point in the eye diagram as depicted in the diagram below. It
provides an adjustment to optimize the bit-error-rate (BER) performance of a transmission link by adjusting the amplifier’s internal
threshold levels.
Eye crossings as a function of
the crossing set-point.
Figure 31 Illustration of Different Crossing Point Settings
In the Analog mode, the Max Output Swing is locked at the maximum set point of 7.0 V
linearly with minimal distortion. However, in order to do this, the user must supply a signal with small enough amplitude so the
amplifier does not saturate, or clip. This mode is recommended for analog signals or higher order modulation formats such as
PAM4. The crossing point adjustment can usually be left at 0, but the user may find other values achieve lower distortion.
Maximum linear input is listed in the specifications.
mplifier is in Analog mode,
which sets the output swing to
its maximum value.
Only the crossing point can be
adjusted.
Figure 32 Amplifier Crossing Point Setting
, so the amplifier can drive the MZM
pp
nalog mode sets output swing to
max. Provides largest linear input
region.
Digital mode provides adjustable swing
and adjustable output amplitude.
Output clips at selectable levels.
Figure 33 Amplifier Gain Curves Illustrate Difference between Digital and Analog Amplifier Modes
Rev. D, March 19, 2019 Page 19
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
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A
4.5 Variable Optical Attenuator Settings Page
To get to the Variable Optical Attenuator (VOA) Settings page, tap in the VOA monitors pane on the Home page. The VOA
provides the means for adjusting and stabilizing the output power after the MZM. Note that the power measurement units for the
entire interface are set on this page. The VOA can operate in either of two modes: 1) Constant Attenuation, and 2) Constant
Output Power.
Tap here to change Modes.
Tap here to select Constant
ttenuation mode.
Tap here to select Constant
Output Power mode.
Figure 34 Constant Attenuation Mode of the VOA
Constant Attenuation Mode maintains a fixed attenuation level between the output of the MZM and the output port on the front
panel. Any fluctuations at the input are transferred to the output.
VOA Mode Set to Constant
ttenuation
Tap here to change
attenuation level.
Tap here to change units of all
displayed power measurements.
Figure 35 Constant Attenuation Mode Settings
Constant Output Power Mode acts as a stabilizer by holding the final optical power constant independent of input fluctuations
(within controllable limits such as input power and attenuation).
VOA Mode Set to Constant
Output Power
Tap here to adjust
output power.
Waning indicates loss of VOA
calibration due to low power.
Loss of VOA calibration
due to low power.
Figure 36 Constant Optical Output Mode of the VOA
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
A
4.6 Laser Settings Page
To access the Laser Settings page, tap on the Laser monitors pane on the Home page. Here the user can control the
laser wavelength and choose whether or not to use the dither feature to stabilize the wavelength (available for models
with C- or L-band lasers only). Turning the dither off will result in lower phase and intensity noise, but the wavelength
may drift slightly over time. The monitors on this page provide live readings of many parameters.
When the internal laser source is a C-band or L-band tunable laser, tap on the Laser Monitors pane on the Home page to access
the Laser Settings page. This page is not available when the 1310 nm fixed-wavelength source is the internal laser. When the
internal laser is not the standard C-band tunable laser, the laser type is denoted in the Options label on the rear panel of the
instrument (please see Figure 3 for location of the Options label).
Optical frequency can be set at increments of 50 GHz for C-band or L-band tunable internal lasers. The ITU channel number on
these pages is an index number given only for convenience, which is unique to this instrument; actual frequencies and spacings
are specified by the ITU standard.
Caution: The laser should not be turned on unless there is an optical fiber connected to the laser out port.
Use these buttons to toggle
the dither function On/Off.
Figure 37 Enabling and Disabling Laser Dither
Tap here to change the laser
wavelength by channel
number.
ctual frequency and
wavelength are displayed in
the monitor section.
Figure 38 Changing the ITU Channel Number
Rev. D, March 19, 2019 Page 21
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
FM Noise Spectrum with and without dither.
Wavelength stability is improved with dither,
but at the expense of adding noise (blue line).
Red line shows Low Noise operation with
dither turned off.
Figure 39 FM Noise Spectrum of the Laser
4.7 Load Page
To get to this page, tap the blue Load button on the Home page. The Load page has several instrument settings stored as
presets for operating the instrument in different standard modes. Applying a preset is a fast way to put the instrument in a known
state. Future firmware revisions will have the ability to store instrument states defined by the user as well.
Tap to preview the settings of
any of the five present states.
Figure 40 Preset State Options on the Load Page
Tapping on one of the presets will bring up a window that displays all the stored settings. The user can then review the choice
before confirming with the green check-mark.
This window displays the
preset parameters for review.
Load the preset by tapping the
green check-box.
Cancel using the red button.
Figure 41 Reviewing the Parameter Values Set by a Preset State
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
4.8 Menu Page
To get to this page tap the blue Menu button on the Home page. The Menu page has links to several pages that allow the user
to control the display, sounds, lights, and get help information. The following sections describe these functions in more detail.
Tap here to control the
touch-screen and the
sounds it makes.
Tap here to find system info.
Tap here to control the accent
LEDs producing the light
emanating from the bottom of the
instrument.
Tap here to find help from
Thorlabs Technical Support.
Figure 42 Controls on the Menu Page
4.8.1 Display and Sound Settings Page
To open the screen shown below, tap the DISPLAY AND SOUNDS button on the Menu pane.
Tap any of the fields to access
the respective controls.
Figure 43 Display and Sound Settings Page
DISPLAY BRIGHTNESS controls the overall brightness of the touch-screen display
DISPLAY SLEEP TIME controls how long the touch-screen display is visible before it sleeps
BUTTON CLICK toggles the sound produced when tapping buttons (On/Off)
NOTIFICATION BEEP toggles the sound associated with certain on screen notifications (On/Off)
Rev. D, March 19, 2019 Page 23
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
4.8.2 System Information Page
To open the screen shown below, tap the SYSTEM INFORMATION button on the Menu pane.
The System Information page displays the installed hardware and software versions.
This is useful information when in
the need for tech-support or to
verify firmware revisions.
Figure 44 System Information Page
4.8.3 Accent LED Settings Page
To open the screen shown below, tap the ACCENT LEDS button on the Menu pane.
The accent LED settings control the intensity of the color LEDs that emanate from the bottom of the instrument. These are a
fun aesthetic feature. You can set them to your favorite color.
Tap any of the three color fields to
access the up/down controls.
Learn to mix colors!
Figure 45 Controls to Adjust the LEDs Providing the Under-Instrument Accent Light
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MX10B, MX40B Series of Optical Transmitters Chapter 4: Operating Instructions
4.8.4 Thorlabs Help Page
To open the screen shown below, tap the THORLABS HELP button on the Menu pane.
The Thorlabs Help page displays the Tech Support phone number, Thorlabs web site, and the installed hardware and software
versions. This information will be useful when speaking with Tech Support.
Figure 46 Thorlabs Help Page
Rev. D, March 19, 2019 Page 25
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MX10B, MX40B Series of Optical Transmitters Chapter 5: Specifications
Chapter 5 Specifications
All Specifications are at 1550 nm and 25 °C ambient temperature, unless otherwise noted. Specifications that are specific to the
MX10B or MX40B series will be marked as such.
5.1 General System Specifications
Parameter Typical Values Notes
Max Laser Output Power
Max Optical Input Power
MX10B, MX40B C-Band Tunable in 50 GHz Steps
Internal Laser
Wavelength Range
1
MX10B-LB,
MX40B-LB
MX10B-1310,
MX40B-1310
External Laser Wavelength Range2
Calibrated Wavelengths
MX10B Series 12.5 Gb/s
Max Bit Rate (Digital)
MX40B Series 40 Gb/s
Optical Extinction Ratio
MX10B Series 7 GHz
Small Signal Bandwidth
MX40B Series 20 GHz
Low Frequency Cutoff
Amplifier RF Input
(Analog Mode)
Amplifier RF Input
(Digital Mode)
3
MX10B Series 100 mV Max
MX40B Series 120 mV Max
MX10B Series 400 mV Typical 3.5 V Max; 4 V Absolute Max
MX40B Series 400 mV Typical 4 V Max; 6 V Absolute Max
Amplifier RF Output Swing3
MX10B Series ±15 V
Amplifier DC Input, Max
MX40B Series ±10 V
Modulator RF Input
3, 4
Optical Insertion Loss
1310 nm, 1550 nm, 1590 nm User Selectable
13.5 dBm From Internal Laser
20 dBm
22 dBm Absolute Maximum,
From External Laser
L-Band Tunable in 50 GHz Steps
1310 nm Fixed-Wavelength
1250 nm – 1610 nm -
Large, Digital Signal
13 dB At Max Bit Rate
Linear, Analog Response
100 kHz -
<5% THD at 1 GHz
Adjustable Swing
3 V – 7 V
(Accessible to User on
MX10B Series Only)
Input is AC-Coupled
5.5 V Typical,
7 V Max
5.0 dB at 1550 nm
7.0 dB at 1310 nm
10 V Absolute Max
(MX10B Series Only)
Laser IN to Optical OUT
1
An 850 nm fixed-wavelength laser can be substituted upon request: contact Thorlabs’ technical support.
2
Using the modulator at another wavelength (e.g. visible light) may cause an increase in insertion loss and will void the
warranty.p
3
Peak to Peak
4
Quoted only for the MX10B series. The external loop-back between output of the RF amplifier and the internal modulator is
accessible to the operator in the MX10B series of transmitters, but the connection is made directly inside the housing of the
MX40B series.
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MX10B, MX40B Series of Optical Transmitters Chapter 5: Specifications
5.2 Power and Environmental Specifications
Parameter Min Max
Main AC Voltage
Power Consumption
Line Frequency
Operating Temperature
Storage Temperature
Humidity
100 VAC 250 VAC
- 60 VA
50 Hz 60 Hz
10 °C 40 °C
0 °C 50 °C
5% RH 85% RH
5.3 Internal Control Specifications
Parameter Typical Notes
Power Monitors Accuracy
Power Monitors Resolution
Power Monitor Insertion Loss
VOA Insertion Loss
VOA Response Time
±0.5 dBm @ 1550 nm
0.01 dBm -
0.1 dB Typical per Monitor
0.4 dB Typical -
1 s -
5.4 Internal Amplifier Specifications
Parameter Typical Values Notes
Rise/Fall Time
RF Amplifier Gain
Small Signal
Bandwidth
RF Amplifier Max Output Swing
Low Frequency Cutoff
Electrical Return Loss
MX10B Series 35 ps Large Signal, Digital Response
MX40B Series 8 ps
MX10B Series 34 dB -
MX40B Series 30 dB
MX10B Series 7 GHz Linear, Analog Response
MX40B Series 20 GHz
3 V – 7 V Adjustable Swing
100 kHz -
-10 dB Any RF Port (to -3 dB BW)
5.5 Internal Modulator Specifications
Parameter Typical Values Notes
Electro-Optic
Bandwidth
DC Optical On/Off Extinction Ratio
RF Drive Voltage (Vpi)
Insertion Loss
MX10B Series 14 GHz (-3 dB)
MX40B Series 35 GHz
20 dB -
5.5 V
4 dB (1550 nm),
6 dB (1310 nm)
At 1 GHz
pp
-
Rev. D, March 19, 2019 Page 27
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MX10B, MX40B Series of Optical Transmitters Chapter 5: Specifications
5.6 Laser Specifications
Parameter Unit Min Typ. Max
C-Band Tunable Laser (MX10B, MX40B)
Optical Output Power
Frequency Range
Wavelength Range
Frequency Accuracy
Tuning Resolution
Tuning Speed (Between Wavelengths)
Side Mode Suppression Ratio (SMSR)
Optical Signal to Noise Ratio (OSNR)
Intrinsic Linewidth
Relative Intensity Noise (RIN)
Back Reflection
Polarization Extinction Ratio (PER)
L-Band Tunable Laser (MX10B-LB, MX40B-LB)
Optical Output Power
Frequency Range
Wavelength Range
Frequency Accuracy
Tuning Resolution
Tuning Speed (Between Wavelengths)
SMSR
OSNR
Intrinsic Linewidth
RIN
Back Reflection
PER
1310 nm Fixed-Wavelength Laser (MX10B-1310, MX40B-1310)
Optical Output Power
Wavelength
SMSR
Intrinsic Linewidth
PER
dBm 12.5 13.5 14.5
THz 191.50 - 196.25
nm 1527.6 - 1565.5
GHz -1.5 - 1.5
GHz - 50 -
s - 10 -
dB 40 55 -
dB 40 60 -
kHz - 10 15
dB/Hz - - -145
dB - - -14
dB 18 - -
dBm 12.5 13.5 14.5
THz 186.35 - 190.95
nm 1570.0 - 1608.8
GHz -1.5 - 1.5
GHz - 50 -
s - 10 -
dB 40 55 -
dB 40 60 -
kHz - 10 15
dB/Hz - - -145
dB - - -14
dB 18 - -
dBm 12.5 13.5 14.5
nm - 1310 -
dB 35 - -
MHz - 2 3
dB - 20 -
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MX10B, MX40B Series of Optical Transmitters Chapter 6: Control and PC Connections
Chapter 6 Control and PC Connections
6.1 General Purpose I/O, RS-232, and USB Connections
The back panel has connectors for monitor and control functions, as well as for upgrading the firmware. Both the RS-232 and
the USB connections can be used for remotely controlling the MX10B and MX40B series via SCPI type serial commands.
Which connector to choose for remote control operation depends on the demands of the application and the user’s preference.
See the remote control user guide (RCUG), which can be downloaded from https://www.thorlabs.com/manuals.cfm, for
information about the commands and connecting the unit to a PC.
The most recent firmware and remote control software tool are available through Thorlabs’ website: please visit
https://www.thorlabs.com/navigation.cfm?Guide_ID=2191 and enter the Item # into the search field. The instrument’s firmware
can be updated by uploading the new version from a PC via the USB port. Thorlabs’ technical support can provide up-to-date
information on available firmware revisions and control functions.
The 15-pin I/O connector provides outputs from the power monitors in the optical path (see the block diagram in Chapter 3). The
power monitors provide a voltage that is proportional to the optical power with one of two gain settings. These values are
available on the I/O DB15 connector. The gain setting for each monitor is determined by software, and reported on the
corresponding Gain Indicator pins. 0.0 V indicates Low Gain (40 V/W) and 3.3 V indicates High Gain (4000 V/W). Maximum
output voltage at the monitor pin is less than 12 V (into a high impedance). Power monitor bandwidth is limited to about 150 Hz.
Figure 47 15-Pin I/O and RS-232 Connectors on the Back Panel
5
10
15 11
Figure 48 15-Pin I/O Connector Pin Configuration
1
6
1 2 3 4 5
6 7 8 9
Figure 49 RS-232 Connector Pin Configuration
I/O Conn. Pin # Description RS-232 Pin # Description
HD DB15 1 Power Monitor 1 (Mon-1) DB9 1 Not Connected
HD DB15 2 Power Monitor 2 (Mon-2) DB9 2 RS-232 Input
HD DB15 3 Power Monitor 3 (Mon-3) DB9 3 RS-232 Output
HD DB15 4 Reserved for Future Use DB9 4 Not Connected
HD DB15 5 Analog Ground DB9 5 Digital Ground
HD DB15 6 Analog Ground DB9 6 Not Connected
HD DB15 7 Analog Ground DB9 7 Not Connected
HD DB15 8 Analog Ground DB9 8 Not Connected
HD DB15 9 Analog Ground DB9 9 Not Connected
HD DB15 10 Analog Ground
HD DB15 11 Reserved for Future Use
HD DB15 12 Reserved for Future Use
HD DB15 13 Power Monitor 1 (Mon-1) Gain Indicator
HD DB15 14 Power Monitor 2 (Mon-2) Gain Indicator
HD DB15 15 Power Monitor 3 (Mon-3) Gain Indicator
Rev. D, March 19, 2019 Page 29
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MX10B, MX40B Series of Optical Transmitters Chapter 6: Control and PC Connections
6.2 The Laser Safety Interlock
The instrument is equipped with a remote interlock connector located on the rear panel. In order to enable the laser source, a
short circuit must be applied across the terminals of the Remote Interlock connector. In practice this connection is made
available to allow the user to connect a remote actuated switch to the connector. The switch (which must be normally open)
has to be closed in order for the laser to be enabled. If the switch changes to an open state, the laser source will automatically
shut down. If the switch returns to a closed condition the laser source must be turned on again in the touchscreen GUI.
All units shipped from Thorlabs are configured with a shorting device installed in the Interlock connector. If you are not going to
use this feature, then leave the shorting device installed. The unit will operate normally as described in the procedures above.
If you wish to make use of the Interlock feature you will need to acquire the appropriate 2.5 mm plug, wire it to the remote
interlock switch, and then plug it in to the back-panel interlock jack in place of the shorting plug. This type of plug is readily
available at most electronics stores. The electrical specifications for the interlock input are shown in the following table.
Specification Value
Type of Mating
Connector
Open Circuit Voltage
Short Circuit Current
Connector Polarity
Interlock Switch
Requirements
2.5 mm Mono Phone Jack
<5 VDC (On Barrel of Plug)
7 mA (Typical)
Tip is Ground, Barrel is at 5 VDC Max
Must be normally open dry contacts
Apply no external voltages to the
interlock input
5VDCmax.
Ground
Page 30 TTN048897-D02
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MX10B, MX40B Series of Optical Transmitters Chapter 7: Mechanical Drawings
Chapter 7 Mechanical Drawings
7.1 MX10B Series
(4.80")
134.8 mm
(5.31")
122.0 mm
250.0 mm
(9.84")
300.0 mm
(11.81")
322.2 mm
(12.69")
Figure 50 Mechanical Drawing of the MX10B Series
Rev. D, March 19, 2019 Page 31
Page 36
MX10B, MX40B Series of Optical Transmitters Chapter 7: Mechanical Drawings
7.2 MX40B Series
(4.80")
134.8 mm
(5.31")
122.0 mm
250.0 mm
(9.84")
300.0 mm
(11.81")
322.2 mm
(12.69")
Figure 51 Mechanical Drawing of the MX40B Series
Page 32 TTN048897-D02
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MX10B, MX40B Series of Optical Transmitters Chapter 8: Maintenance, Repair, and Fuses
Chapter 8 Maintenance, Repair, and Fuses
8.1 Maintenance and Repair
The instrument should not need regular maintenance by the user. If necessary the display, housing, and front panel can be
cleaned using a soft cloth moistened with normal, mild glass cleaner. Do not use any chemical solvents or harsh cleaners on
the display. Do not spray any cleaning solutions directly onto any part of the unit.
The instrument does not contain any modules that can be repaired by the user. If a malfunction occurs, please contact Thorlabs
Technical Support and arrangements will be made to investigate the problem. Do not remove the cover. There are no user
serviceable components inside.
Optical patch cords used to connect to the front panel of the instrument should have their end faces cleaned every time a new
connection is made. The end faces of the internal fiber connectors can easily be damaged by the use of dirty fiber ends. If
damage occurs, the instrument will need to be sent back for repair. We suggest using a fiber end-face cleaning product such as
the Thorlabs FCC-7020 shown below. Alternatively, a lint-free cloth moistened with isopropyl alcohol or methanol can be used.
Never use acetone.
Thorlabs FCC-7020
Fiber End-Face Cleaner for Patch Cords
The optical connectors on the front panel may be cleaned using a 2.5 mm bulkhead cleaner such as the Thorlabs FBC1. This
allows the user to clean the fiber end-face without removing it from the internal bulkhead adapter.
Thorlabs FBC1
Fiber End-Face Cleaner for Bulkheads
8.2 Replacement Parts
The following parts can be obtained by contacting Thorlabs Technical Support
SMA 50 Ω Loads (Used for Front Panel RF Connectors)
PM Loopback Fiber Patch Cord for Front Panel
SMA Loopback RF Cable (Not in MX40B Series)
Laser Interlock Keys for Front Panel Switch
2.5 mm Interlock Pin (for Back Panel)
1.25 A 250 VAC Fuse for Main Power
Instrument IEC Main Power Cord
Rev. D, March 19, 2019 Page 33
Page 38
MX10B, MX40B Series of Optical Transmitters Chapter 8: Maintenance, Repair, and Fuses
8.3 Replacing the Main Fuse
The system is protected by a main fuse located in the power entry module where the main power cable plugs into the back
panel of the instrument. If the instrument does not appear to power-up, especially after a power outage or storm, you can
check the condition of the main power fuse without removing the cover of the instrument by following the following steps.
1. Put the instrument in “Standby” mode by pressing the standby button on the front of the instrument.
Wait until the button turns from green to amber.
2. Turn the power off using the switch on the back panel of the instrument.
3. Unplug the main power cable.
4.
Carefully remove the fuse holder slide from the power entry module (use a flat screwdriver)
.
Figure 52
Power Entry Module
Figure 53
Removing the Fuse Holder Slide
Investigate the fuse. This can be done with a simple continuity check. If in doubt, replace the fuse. A spare fuse is stored in the
fuse holder. Additional replacement fuses can be purchased from Thorlabs. Always use fuses of the same type as the
original.
Figure 54 Fuse
1. Reinstall the fuse holder slide into the power entry module, taking care that it fully seats until the top is flush with the
rest of the power entry module.
2.
Plug the main power cable back into the unit and power on as described in the Getting Started section of the manual.
If the fuse blows repeatedly, it is likely that an internal failure has occurred. Do not attempt to bypass the fuse as this can create
a dangerous situation that could further damage the instrument or harm personnel. In this case, please contact Technical Support
for directions.
Page 34 TTN048897-D02
Page 39
MX10B, MX40B Series of Optical Transmitters Chapter 9: Troubleshooting
Chapter 9 Troubleshooting
Below is some information about status indicators and a few checks to help in troubleshooting general problems. If you have
any questions, please contact your local Thorlabs Technical Support office.
If the unit does not appear to turn on correctly, please check the following items:
Ensure that the main AC receptacle is powered
Ensure that main power cable is fully seated at both ends
Ensure that back power switch is in the “I” position
Check the main power fuse (see Maintenance and Repair Section)
The color of the Standby Button, which is on the front panel, indicates several status conditions as follows:
Standby Button Color Condition
Solid Green
Solid Amber
Blinking Green
Blinking Amber
Blinking Amber/Green
Fading Amber/Green
Indicates normal ON state.
Indicates unit is in Standby Mode.
Press the button to turn the instrument ON.
Indicates the main AC power is unstable. When the AC power is
restored, the instrument will return to the standby mode (amber).
Indicates the instrument is overheated. Make sure the fan is running
and none of the vents are blocked. If there are no ventilation issues,
then the box should cool itself and return to the standby.
Do not operate, or leave the instrument in standby mode, in an
environment above 40 °C.
Indicates the instrument is both overheated and the main AC power is
unstable (see individual troubleshooting for these conditions above).
Indicates the instrument is in the firmware upgrade mode.
If this condition appears after attempting to upgrade the firmware, the
update may have failed, or the unit may have been left in the update
mode. Try running the firmware update again.
This condition may have also been reached by holding down the
standby button for a long time while turning on the power. In this case,
turn the unit off, wait for a few seconds, and turn it back on.
If this condition for any other reason, turn the unit off, wait for a few
seconds, and turn it back on.
If these attempts to recover continue to fail, the instrument’s firmware
may have been corrupted. Contact Tech Support for help.
If the optical power at any point of the system is lower than expected, resolving the problem always starts by cleaning the
optical fiber ends. Contaminated fiber ends, which attenuates the intensity of the transmitted light, is a very common issue when
using single-mode fibers. Follow the suggestions provided in the Maintenance and Repair section of this manual to clean the
optical fiber ends.
Rev. D, March 19, 2019 Page 35
Page 40
MX10B, MX40B Series of Optical Transmitters Chapter 10: Declarations of Conformity
Chapter 10 Declarations of Conformity
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MX10B, MX40B Series of Optical Transmitters Chapter 10: Declarations of Conformity
Rev. D, March 19, 2019 Page 37
Page 42
MX10B, MX40B Series of Optical Transmitters Chapter 11: Thorlabs Worldwide Contacts
Chapter 11 Thorlabs Worldwide Contacts
USA, Canada, and South America
Thorlabs, Inc.
56 Sparta Avenue
Newton, NJ 07860
USA
Tel: 973-300-3000
Fax: 973-300-3600
www.thorlabs.com
www.thorlabs.us (West Coast)
Email: sales@thorlabs.com
Support: techsupport@thorlabs.com
Europe
Thorlabs GmbH
Hans-Böckler-Str. 6
85221 Dachau
Germany
Tel: +49-(0)8131-5956-0
Fax: +49-(0)8131-5956-99
www.thorlabs.de
Email: europe@thorlabs.com
France
Thorlabs SAS
109, rue des Côtes
78600 Maisons-Laffitte
France
Tel: +33 (0) 970 444 844
Fax: +33 (0) 825 744 800
www.thorlabs.com
Email: sales.fr@thorlabs.com
UK and Ireland
Thorlabs Ltd.
1 Saint Thomas Place, Ely
Cambridgeshire CB7 4EX
Great Britain
Tel: +44 (0)1353-654440
Fax: +44 (0)1353-654444
www.thorlabs.com
Email: sales.uk@thorlabs.com
Support: techsupport.uk@thorlabs.com
Scandinavia
Thorlabs Sweden AB
Bergfotsgatan 7
431 35 Mölndal
Sweden
Tel: +46-31-733-30-00
Fax: +46-31-703-40-45
www.thorlabs.com
Email: scandinavia@thorlabs.com
Brazil
Thorlabs Vendas de Fotônicos Ltda.
Rua Rosalino Bellini, 175
Jardim Santa Paula
São Carlos, SP 13564-050
Brazil
Tel: +55-16-3413 7062
www.thorlabs.com
Email: brasil@thorlabs.com
Japan
Thorlabs Japan, Inc.
3-6-3 Kitamachi,
Nerima-ku, Tokyo 179-0081
Japan
Tel: +81-3-6915-7701
Fax: +81-3-6915-7716
www.thorlabs.jp
Email: sales@thorlabs.jp
China
Thorlabs China
Room A101, No. 100
Lane 2891, South Qilianshan Road
Putuo District
Shanghai
China
Tel: +86 (0) 21-60561122
Fax: +86 (0)21-32513480
www.thorlabschina.cn
Email: chinasales@thorlabs.com
Thorlabs verifies our compliance with the WEEE (Waste Electrical and Electronic Equipment) directive of
the European Community and the corresponding national laws. Accordingly, all end users in the EC may
return “end of life” Annex I category electrical and electronic equipment sold after August 13, 2005 to
Thorlabs, without incurring disposal charges. Eligible units are marked with the crossed out “wheelie bin”
logo (see right), were sold to and are currently owned by a company or institute within the EC, and are
not dissembled or contaminated. Contact Thorlabs for more information. Waste treatment is your own
responsibility. “End of life” units must be returned to Thorlabs or handed to a company specializing in
waste recovery. Do not dispose of the unit in a litter bin or at a public waste disposal site.
Page 38 TTN048897-D02
Annex I
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www.thorlabs.com
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