Tektronix LPB1300,LPB1550 Instruction Manual Instruction Manual
Instruction Manual
LPB 1300 & LPB 1550
Tunable Laser Sources
071-0587-00
Copyright © T ektronix, Inc. All rights reserved.
T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
WARRANTY
T ektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of one (1) year from the date of shipment. If a product proves defective during this warranty period, T ektronix,
at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in
exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by T ektronix, with shipping charges prepaid.
T ektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
T ektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than T ektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction
caused by the use of non-T ektronix supplies; or d) to service a product that has been modified or integrated with other
products when the effect of such modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO
REP AIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO
THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE
LIABLE FOR ANY INDIRECT , SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE
OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.
Table of Contents
User Information
General Safety Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting Tektronix vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Programs vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
First Time Operation 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Entering Numerical Values 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Power Control 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Panel 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Advanced Functions 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary Inputs and Outputs 1–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Control 1–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS-232-C Remote Control 1–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IEEE-488.1 Remote Control 1–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Errors 1–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Information
Performance Verification 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Required 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute W avelength Accuracy 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wavelength Range and Output Power 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 2–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning and Caring for Optical Connectors and Fibers 2–17. . . . . . . . . . . . . . . . . . .
Calibration 2–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Line Fuse 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Exterior 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Packaging for Shipment 2–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Parts 2–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LPB 1300 and LPB 1550 Tunable Laser Sources
i
Table of Contents
Appendices
Index
Appendix A: Parameters A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Error Messages B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix C: RS-232-C Control Commands C–1. . . . . . . . . . . . . . . . . . . . .
Space Characters C–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Message T ermination C–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D: IEEE-488.1 Control Command Summary D–1. . . . . . . . . . .
ii
LPB 1300 and LPB 1550 Tunable Laser Sources
List of Figures
Table of Contents
Figure 1–1: Front panel 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–2: Rear panel 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–3: Auxiliary connectors 1–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–4: Remote interlock connector 1–19. . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–1: Accessing the line fuse 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: Replaceable parts 2–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: Standard accessories 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–4: Optional power cords 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LPB 1300 and LPB 1550 Tunable Laser Sources
iii
Table of Contents
List of Tables
Table 1–1: Description of Display, Mode, and Setup keys 1–8. . . . . . . . .
Table 1–2: Voltage scaling of monitor outputs 1–18. . . . . . . . . . . . . . . . . . .
Table 1–3: Range of frequencies for modulating the optical power 1–20.
Table 1–4: Example of dialog between the controller and the
tunable laser (RS-232-C) 1–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–5: Examples of message formats with numerics (RS-232-C) 1–24
Table 1–6: Command parameters (RS-232-C) 1–24. . . . . . . . . . . . . . . . . .
Table 1–7: Command responses (RS-232-C) 1–25. . . . . . . . . . . . . . . . . . . .
Table 1–8: Operating mode commands (RS-232-C) 1–25. . . . . . . . . . . . . .
Table 1–9: System parameters (RS-232-C) 1–26. . . . . . . . . . . . . . . . . . . . .
Table 1–10: Other system commands (RS-232-C) 1–27. . . . . . . . . . . . . . . .
Table 1–11: Definition of operating commands (GPIB) 1–28. . . . . . . . . . .
Table 1–12: Command parameters (GPIB) 1–29. . . . . . . . . . . . . . . . . . . . .
Table 1–13: Queries (GPIB) 1–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–14: Operating mode commands (GPIB) 1–30. . . . . . . . . . . . . . . .
Table 1–15: Bits in status word (GPIB) 1–32. . . . . . . . . . . . . . . . . . . . . . . .
Table 1–16: Specifications 1–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–17: Laser class specifications 1–38. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–18: Certifications and compliances 1–39. . . . . . . . . . . . . . . . . . . . .
Table 2–1: Test equipment 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–2: Wavelength range 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–1: Valid range of parameter settings A–1. . . . . . . . . . . . . . . . . . .
Table B–1: Error Messages B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table C–1: Summary of RS-232-C control commands C–1. . . . . . . . . . . .
Table D–1: Summary of IEEE-488.1 control commands D–1. . . . . . . . . .
Table D–2: Status word D–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv
LPB 1300 and LPB 1550 Tunable Laser Sources
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
To Avoid Fire or
Personal Injury
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Wear Eye Protection. Wear eye protection if exposure to high-intensity rays or
laser radiation exists.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry .
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
LPB 1300 and LPB 1550 Tunable Laser Sources
v
General Safety Summary
Symbols and Terms
T erms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
T erms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:
CAUTION
Refer to Manual
Laser Class 3A and Class IIIb
WARNING
WARNING
High Voltage
Protective Ground
(Earth) Terminal
Laser Source
WARNING
Laser Class 3A and Class IIIb
vi
LPB 1300 and LPB 1550 Tunable Laser Sources
Preface
Contacting Tektronix
This manual provides the user information necessary to operate, program, and
verify the performance of the LPB 1300 and LPB 1550 Tunable Laser Sources.
The manual also contains maintenance procedures that the user can perform from
outside the instrument and information about user serviceable parts.
Components inside the instrument are not user serviceable. Refer all servicing of
internal components to service personnel authorized by Tektronix.
Service Programs
Product
Support
Service
Support
For other
information
To write us Tektronix, Inc.
For application-oriented questions about a Tektronix measurement product, call toll free in North America:
1-800-TEK-WIDE (1-800-835-9433 ext. 2400)
6:00 a.m. – 5:00 p.m. Pacific time
Or contact us by e-mail:
tm_app_supp@tektronix.com
For product support outside of North America, contact your
local Tektronix distributor or sales office.
Contact your local Tektronix distributor or sales office. Or visit
our web site for a listing of worldwide service locations.
www.tektronix.com
In North America:
1-800-TEK-WIDE (1-800-835-9433)
An operator will direct your call.
P.O. Box 1000
Wilsonville, OR 97070-1000
Tektronix offers extended warranty and calibration coverage programs that you
can purchase as options with the product. These programs are cost-effective ways
to maintain genuine Tektronix service for your instrument. Ask your Tektronix
distributor or sales office for details.
LPB 1300 and LPB 1550 Tunable Laser Sources
vii
Preface
viii
LPB 1300 and LPB 1550 Tunable Laser Sources
User Information
Getting Started
The LPB 1300 and LPB 1550 Tunable Laser Sources are compact, bench-top
instruments for the development and test of fiber-optic systems and components.
The flexible, general-purpose design is suitable for a wide range of applications.
The optical layout uses a modified Littman-Metcalf configuration. The doublepass reflection on the grating provides maximum dispersion while the very short
cavity maximizes mode-spacing. This design avoids mode competition and
guarantees spectrally pure, single-mode operation. The high-performance optical
isolator and the angle-polished fiber on the output work to protect the laser
cavity from interference and ensure optimum power and spectral purity. A
dihedral reflector in the rear of the laser cavity acts as a two-dimensional corner
cube to keep the resonator in tune.
The LPB 1300 and LPB 1550 Tunable Laser Sources offer the following
benefits:
H Precise wavelength tuning. Provides a 1 pm resolution.
H Digitally-controlled analog fine tuning. Extends resolution beyond the 1 pm
steps into the MHz domain.
H Mode hop-free operation. Ensures smooth and accurate wavelength sweep
for reliable testing of narrow band components (mode hop spacing > 70 nm
on the LPB 1550 laser and > 40 nm on the LPB 1300 laser).
H High output power. Delivers the rated output power over the entire wave-
length range: 0 dBm (standard), 6 dBm (Option P6), or 10 dBm (Option PX,
LPB 1550 only).
H Outstanding long-term stability. Keeps the resonator in tune with a self-
aligning optical layout, reliable design, and thermally stable construction.
Prevents small changes caused by shock, vibration, temperature, or
mechanical drift from affecting operation.
H Intuitive, user-friendly controls. Simplifies operation with easy-to-use
keypad or multi-speed rotary control.
H Modulation possibilities. Analog and digital modulation of the optical power
from DC to 1 GHz with mode-locked operation at 5 GHz. The 150 kHz
linewidth can go to 100 MHz when high coherence is a problem.
H Remote operation and easy system integration. Provides IEEE-488.1 and
RS-232-C computer interfaces, modulation inputs, and monitor outputs.
LPB 1300 and LPB 1550 Tunable Laser Sources
1–1
Getting Started
Unpacking
Handle the instrument carefully when unpacking. Keep the instrument in a lateral
position at all times.
CAUTION. This instrument contains delicate optical components. To avoid
misalignment of the optical components, use both handles on the sides of the
instrument and keep the instrument in a lateral position during unpacking and
handling.
Do not set the instrument on the rear bumpers. These bumpers are only for
purposes of protecting the rear panel from contact with adjacent surfaces and
should not be used as feet when transporting or storing the instrument.
After unpacking, set the instrument on a stable surface that is free of excessive
vibration.
Standard Accessories
The following accessories are standard with the LPB 1300 and LPB 1550
Tunable Laser Sources:
H Certificate of traceable calibration
H Calibration data (Option D1 test report)
H FC/PC-to-FC/APC adapter cable
H Safety lock key
H Instruction manual
H Power Cord
For a list of replaceable part numbers, see the Replaceable Parts section that
begins on page 2–21.
1–2
LPB 1300 and LPB 1550 Tunable Laser Sources
Options
Getting Started
The following options are available at the time of purchase:
H Option A1, A2, or A3 Power Cord, see Figure 2–4 on page 2–22
H Option C3 Three years calibration service
H Option D3 Three years calibration data
H Option 1L Labview driver
H Option P6 6 dBm output power (LPB 1550 only)
H Option R3 Three years extended warranty
H Option PX 10 dBm output power (LPB 1550 only)
H Option 1M Polarization maintaining fiber and adapter cable (blue)
H Option 1W Modified wavelength range
H Option 2W Modified wavelength range (LPB 1550 only)
H Option 3W Modified wavelength range (LPB 1550 only)
NOTE. The range of each wavelength (W) option varies according to the model
and power (P) option. See the Specifications section on page 1–37 for details.
LPB 1300 and LPB 1550 Tunable Laser Sources
1–3
Getting Started
Installation
First Time Operation
Install the LPB 1300 and LPB 1550 Tunable Laser Sources as follows:
1. Use the proper power cord for your location.
2. Keeping the instrument in a lateral position, transport the instrument using
the handles on both sides.
3. Place the instrument on a stable surface that is free of excessive vibration.
4. Make sure the keyed switch on the front panel is in the standby mode before
applying power.
5. Allow air for the cooling fan to flow freely around the instrument; move any
equipment or papers that could impede air flow.
Cleaning the Optical
Connections
Connecting the Laser
Output
WARNING. To avoid eye damage, do not look into the laser output or into the end
of an optical cable. Even though the laser radiation is not visible, the intense
infrared light can still cause eye damage.
Always disable laser output while connecting and disconnecting the optical fiber.
For the best performance, optical connections must be clean and free of
contamination. Cleaning instructions for optical connections are on page 2–17.
To connect the laser output, remove the protective cap and use a fiber with a
FC/APC type connector.
CAUTION. To avoid damage to the laser output, always use a FC/APC type
connector. To connect other styles, use the FC/PC to FC/APC jumper.
To help protect the laser output, leave a jumper cable in place when making
connections to other devices. When the laser output is not connected, the
protective cover should be over the laser output.
1–4
LPB 1300 and LPB 1550 Tunable Laser Sources
Getting Started
Initializing the Laser
For safe operation, use the following procedure to initialize the laser:
1. Make sure the key on the front panel is in the Standby position.
2. Connect line cord to the socket on the rear panel and then to the proper
mains supply.
3. Set the rear panel MAINS switch to on ( I ). See Figure 1–2 on page 1–12.
4. Turn the front panel POWER key to the right (ON). During the initialization
phase, the message “Initializing....” displays. This message clears once the
laser is initialized and ready for operation.
At the end of the initialization, the message “Disabled...” appears on the display
signifying that the laser output is ready to enable.
CAUTION. Avoid switching the laser off before the laser is fully initialized.
After initialization, the cavity tunes to a wavelength near the center of the
wavelength range.
The optical power setting initializes to zero when the laser is enabled.
Enabling the Output
Shutting Down the Laser
For safety reasons, the laser provides an Enable button to enable or disable the
output.
H To enable the laser output, press the Enable button. The Enable key lights.
H To disable the laser output, press the Enable button and check that the Enable
light is out.
To shut down the laser, turn the front panel key left to the standby position. The
message “Parking...” displays and the optical head automatically moves to the
parking position. After a few seconds, the laser shuts down by itself.
CAUTION. Avoid switching the power to standby before the laser is fully
initialized. After turning the power to standby, wait at least thirty seconds before
initializing the laser again.
LPB 1300 and LPB 1550 Tunable Laser Sources
1–5
Getting Started
1–6
LPB 1300 and LPB 1550 Tunable Laser Sources
Operating Basics
Front Panel
This section provides an overview of the controls, connectors, and functions of
the LPB 1300 and LPB 1550 Tunable Laser Sources.
Figure 1–1 shows the front panel features.
l,f
Figure 1–1: Front panel
Power
The front panel is divided into five areas:
H Power
H Data
H Mode
H Setup
H Optical Output
After switching on the mains switch (rear panel), the power switch initializes the
laser head in the ON position or parks the laser head in the STBY (standby)
position. When the message “Disabled...” appears, the laser is ready to enable by
using the ENABLE key located in the data area.
LPB 1300 and LPB 1550 Tunable Laser Sources
1–7
Operating Basics
CAUTION. Avoid switching the power to standby before the tunable laser is fully
initialized. After turning the power to standby, wait at least thirty seconds before
initializing the laser again.
Data, Mode, and Setup
The Data area displays wavelength or frequency (l, f) and the output power
(mW/dBm) as selected by the data keys. The instrument also uses this area to
display messages.
Mode keys select instrument functions and work with keys in the Setup area to
enter numerical values, access advanced functions, and set scan steps.
Table 1–1 lists the display and mode keys along with a description of the
function they perform. For more instructions, see the section Entering Numerical
Values on page 1–10.
T able 1–1: Description of Display, Mode, and Setup keys
Name Description
nm/GHz Displays the wavelength in nm or the optical frequency in GHz.
mW/dBm Displays the power in dBm or mW.
l,f Enables entry of a new value for the wavelength.
P Enables entry of a new value for the power output and switches to the
constant power mode.
I Enables entry of a new value for the diode current and switches to the
constant current mode.
1–8
ENABLE Enables/Disables the optical output. When disabled, the message
“Disabled...” is displayed. When enabled, the Enable light is on.
REMOTE Enables front panel (local) operation. The Remote button has no effect when
the light is off during local operation.
The Remote key lights and Remote operation begins when the laser
receives data on either the RS-232-C or the IEEE-488.1nterface.
FSC (Fine Scanning mode.) Enables a quasi-continuous sweep of the
wavelength on a ± 2 GHz range. Once this mode is selected, the
wavelength can be continuously adjusted with the rotating knob. The
wavelength sweep is displayed in GHz. To exit the fine scanning mode,
press the FSC key again.
APC (Automatic Power Control.) Switches between constant current (APC light
off) and constant power (APC light on) modes. See Automatic Power
Control on page 1–1 1.
² or ³ Increases or decreases the wavelength by the value of the STEP parameter.
Backspaces or forward spaces to correct numbers during keypad entry.
LPB 1300 and LPB 1550 Tunable Laser Sources
Operating Basics
T able 1–1: Description of Display, Mode, and Setup keys (Cont.)
Name Description
± or ° Decreases or increases the elementary step of the control knob. The
message, “Scroll...” indicates which digit relative to the decimal point the
control knob changes.
ENTER Enters the numerical value.
STEP Changes the STEP parameter.
2ND Accesses advanced functions.
2ND > l,f Initiates wavelength calibration.
2ND > P Initiates power calibration.
2ND > STEP Enables wavelength scan mode.
2ND > 1 Disables/Enables backlash suppression of the micrometer screw.
2ND > 2 Displays software release.
2ND > REMOTE Changes GPIB address.
Optical Output
2ND > FSC Enables linewidth coherence control.
The Optical Output area includes the angle polished connector (APC) output
with protective cover. The ENABLE key that enables and disables the optical
output is located in the data area.
LPB 1300 and LPB 1550 Tunable Laser Sources
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Operating Basics
Entering Numerical Values
Using the basic procedure in this section, you can use the keypad or control knob
to edit the parameters for the following functions:
H Emission wavelength (l,f)
H Optical power (P)
H Diode Current (I)
H Wavelength step (STEP)
Information on editing the parameters for other functions begins on page 1–15.
Basic Procedure
Use the keypad or control knob to enter numerical values as follows:
1. Press the appropriate key function (l, f, I, or P).
a. The related indicator lights and the display shows the present setting for
the chosen parameter.
b. The equal sign (=) on the display blinks to show that this parameter can
be changed.
2. Change the present setting with the keypad or the control knob.
a. To correct a number during entry, back space or forward space using the
z or ! keys.
b. To exit the edit mode without saving the new value, press the same
parameter key (l, f, I, or P) as the function.
3. If you are using the keypad, press the ENTER key to enter the new value. If
you are using the control knob, the value is updated in real time.
4. If the value is outside the range of acceptable settings, the message “Lim”
displays and the setting remains the same.
For instance, to enter a power of 0.5 mW, key in the following sequence:
1–10
P Parameter selection
0.5 New value ( .5 is also valid)
ENTER Validation of the new value
LPB 1300 and LPB 1550 Tunable Laser Sources
Operating Basics
NOTE. If the new value is outside the valid range for the parameter, an error
message displays (“Value error Press ENTER”). Pressing ENTER retains the
former setting and suspends scanning or calibration.
For a listing of the valid ranges for each system parameter, refer to Appendix A
on page A–1.
Arrow Keys
Backlash Suppression
The z and ! keys decrease or increase the wavelength by the step value. To
change the step value, press STEP and use the control knob or keypad to enter
the new value (STEP > new value in nm > ENTER). The keys also allow you to
forward or backspace during keypad entry.
The # and " keys below the control knob decrease or increase the elementary
step of the control knob. In the message “Scroll 0.01,” for example, the 1
indicates which digit in relation to the decimal point the control knob changes.
To select a different digit, press either arrow key repeatedly until the 1 is in the
same place as the digit you wish to change, and then turn the control knob.
When the using the keypad or the z and ! arrow keys to set the wavelength
value, the software of the tunable laser suppresses the mechanical backlash of the
tuning mechanism.
When using the control knob to change the wavelength value, the value changes
in real time and the backlash suppression is not active. A dot (“.”) at the right
end of the wavelength display indicates the absence of backlash suppression.
Example : “l=1555.000 nm
The backlash suppression procedure activates the next time you use the keypad
or the z and ! arrow keys to enter a value.
.”
Automatic Power Control
The Automatic Power Control (APC) button on the front panel switches between
constant current and constant power modes. In the constant current mode, the
APC light is off and the I parameter indicates the diode current. When the APC
light is on, the diode current is controlled to deliver optical power equal to the P
parameter.
LPB 1300 and LPB 1550 Tunable Laser Sources
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Operating Basics
Rear Panel
NOTE. In some cases, it may not be possible to reach the required power even
with the maximum allowable current. When this happens, the current limits at
the maximum value and the message “Lim” appears at the right end of the
displayed power.
(Example : P = 5.4 mW Lim )
Figure 1–2 shows the rear panel of the LPB 1300 and LPB 1550 Tunable Laser
Sources.
Figure 1–2: Rear panel
1–12
The MAINS module includes the mains power switch, power cord connection,
and fuse drawer.
In addition to the MAINS module and two remote control connectors (RS-232-C
and IEEE-488.1), ten auxiliary IN/OUT connectors are available on the rear
panel:
Analog and TTL outputs:
H Mod. Sync. (modulation sync) TTL output
H Mod. Out (modulation output) TTL output
Monitor (scaled) outputs:
H Sync (motor sync)
H l (wavelength)
LPB 1300 and LPB 1550 Tunable Laser Sources
Operating Basics
H P (power)
H I (current)
Inputs:
H FSC (fine scanning and coherence control)
H HF Mod (high frequency modulation)
H LF Mod (low frequency modulation)
H Remote interlock connection as required by Class IIIb.
For a discussion of these connectors, see Auxiliary Inputs and Outputs on
page 1–18.
LPB 1300 and LPB 1550 Tunable Laser Sources
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Operating Basics
1–14
LPB 1300 and LPB 1550 Tunable Laser Sources
Reference
Advanced Functions
This section describes the advanced functions, RS-232-C and IEEE-488.1
interfaces, and auxiliary inputs and outputs of the LPB 1300 and LPB 1550
Tunable Laser Sources.
Press the 2ND key on the front panel (which functions like a shift key) to access
the following functions:
H Wavelength scanning
H Wavelength calibration
H Power calibration
H Backlash suppression of the micrometer screw
H Changing the GPIB address
Wavelength Scanning
Wavelength scanning presets the tunable laser to emit a range of different
wavelengths for selected intervals of time.
1. To activate the scan mode, press 2ND > STEP.
The tunable laser requests the first of the following scan parameters:
H The first scan wavelength
H The last scan wavelength
H The scan increment
H The pause time between two steps
2. To progress through the scan parameters, you must confirm or modify each
parameter in order:
a. To modify a parameter, press the numeric keys followed by the ENTER
key.
b. To keep a parameter, press the ENTER key without entering a new
value.
c. To cancel the entire scan procedure and retain the previous parameters,
press the STEP key a second time before entering the value.
LPB 1300 and LPB 1550 Tunable Laser Sources
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Reference
After you enter the last parameter, the tunable laser goes to the first wavelength.
The wavelength increments step by step (applying the scan step parameter value)
until the tunable laser reaches the last wavelength. At each step the wavelength
remains constant during the pause time parameter.
3. To suspend scanning, press the STEP key during wavelength scanning. The
message: “Stop scan (1/0) ?” asks the operator to confirm termination of the
scan.
a. To stop scanning, press 1, scanning stops and the emission wavelength
remains at the displayed value.
b. To resume scanning, press 0.
For all modes except the remote mode, the tunable laser goes back to the first
wavelength and scanning repeats indefinitely after reaching the upper wavelength.
In the remote mode, scanning ends when the tunable laser reaches the upper
wavelength.
Wavelength Calibration
The wavelength calibration procedure calibrates the wavelength setting of the
laser output. The procedure requires the use of an optical wavemeter.
CAUTION. This procedure erases factory calibration data for the optical
wavelength settings. Do not use this procedure unless you intend to erase this
data.
1. Connect the output of the tunable laser to a wavemeter.
2. Press the 2ND key followed by the l key to initiate wavelength calibration.
The tunable laser moves to a short wavelength of the tuning range and
displays the default value corresponding to the calibration data.
3. Measure the first wavelength with the wavemeter.
4. Enter the reading after the display prompt (l = ).
The tunable laser moves to a long wavelength of the tuning range, and
displays the default value corresponding to the actual calibration data.
5. Measure the second wavelength with the wavemeter.
6. Enter the reading after the display prompt (l = ).
1–16
The wavelength calibration is now complete and all wavelength settings are
referenced to the new data.
LPB 1300 and LPB 1550 Tunable Laser Sources
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