Viavi COSA-4055 User Manual

MTS ⁄ T-BERD 5800

COSA-4055

User Manual

Please direct all enquiries to your local Viavi sales company.
The addresses can be found at:

www.viavisolutions.com/en-us/contact-sales-expert

The description of additional features of the device can be found
at:

www.viavisolutions.com/en-us/products/network-test-and­certification

© Copyright 2016 Viavi Solutions Inc. All rights reserved.

Viavi and the Viavi logo are trademarks of Viavi Solutions Inc.

All other trademarks and registered trademarks are the
properties of their respective owners.

Viavi Solutions Deutschland GmbH

Arbachtalstraße 5, 72800 Eningen u. A.

Order no.: BN 3071/98.21

Edition: 2016.01

Previous Edition: 2015.03

Note: Changes may be made to specifications, descriptions and
delivery information.

Printed in Germany

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 1

Contents

Introducing the COSA-4055 module . . . . . . . . . . . . . . . . 4

SFP slots. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Proper usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

General laser safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Specific laser safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Optical surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Battery operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Start the COSA application. . . . . . . . . . . . . . . . . . . . . . . . 9

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Test Auto WDM mode . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Manual configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 10

Acquisition parameters . . . . . . . . . . . . . . . . . . . . . . . . 11

Analysis parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Parameters of display and analysis of the results. . . . 14

Link Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

File Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Contents

2 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Trace display functions. . . . . . . . . . . . . . . . . . . . . . . . . 20

Result display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Using the cursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

The Zoom function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

The Shift function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

The measurement function . . . . . . . . . . . . . . . . . . . . . 24

Multiple traces (Overlay) . . . . . . . . . . . . . . . . . . . . . . . 27

Table display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Channel sort. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Table notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Result colours . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Trace & Table display . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Drift measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Fast Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

File system report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

File management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Storing OSA measurements . . . . . . . . . . . . . . . . . . . .39

Recalling OSA files. . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Recycling information . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Viavi Environmental Management Program. . . . . . . . . 40

RoHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

1

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 3

Chapter 1

Optical Spectrum
Measurement

This chapter describes the different stages in carrying out a spectrum
analysis of an optical CWDM signal.

The topics discussed in this chapter are as follows:

–

“Introducing the COSA-4055 module” on page 4

– “Safety information” on page 5

– “Configuration” on page 9

– “Acquisition” on page 20

– “Result display” on page 21

– “Table display” on page 29

– “Trace & Table display” on page 34

– “Drift measurement” on page 34

– “File management” on page 39

– “Recycling information” on page 40

NOTE

This manual is an addition to the 5800 Base Unit user manual. For all
questions not covered in this manual – particularly concerning safety
– please refer to the Base Unit user manual.

Chapter 1 Optical Spectrum Measurement

Introducing the COSA-4055 module

4 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Introducing the COSA-4055 module

The COSA-4055 is Viavi’s new generation of CWDM analyzer modules.
It scans the full wavelength range between 1260 and 1625 nm for
commissioning, upgrade, and trouble shooting of CWDM networks. The
COSA-4055 offers the functionality and speed of an optical spectrum
analyzer in a handheld form at a fraction of the price of an OSA. The
measurement result is displayed in a graphical (trace) and numerical
(table) format providing detailed information of the power level and the
wavelength of CWDM channels.

Fig. 1 Two versions of the COSA-4055 modules

Basic Version

BN 2301/01

Advanced Version

BN 2301/02

Chapter 1 Optical Spectrum Measurement

Safety information

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 5

The COSA-4055 comes in two versions. The basic version (BN 2301/01)
provides CWDM analyzer functionality only. The advanced version
(BN 2301/02) additionally offers 2 integrated SFP slots for mounting up
to 2 SFP transceiver modules (to be ordered separately). The transceiver
modules can be used as a CWDM stimulus to check CWDM networks
together with the CWDM analyzer.

SFP slots

The COSA-4055 BN 2301/02 has two integrated SFP slots. Any
transceiver module connected to the SFP slot is automatically activated
and emits optical radiation at the output “TX”. The input “RX” of the
transceiver module has no function. The optical laser radiation is
indicated by LEDs assigned to the SFP slots. The SFP modules are hot
pluggable and can be changed during operation of the COSA-4055.

Safety information

Conventions

This guide uses naming conventions and symbols, as described in the
following tables.

Symbol conventions

Version

2301/02 only

This symbol represents a general hazard.

This symbol represents a risk of electrical shock.

This symbol represents dangerous laser radiation.

Chapter 1 Optical Spectrum Measurement

Safety information

6 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Safety definitions

Proper usage

This instrument is intended for measurements on optical fiber devices
and systems.

 Please make sure the device is not operated outside the permitted

ambient conditions.

 Observe the specified measurement range.

 Always make sure that the device is in proper working order before

switching it on.

General

laser safety

WARNING

Indicates a potentially hazardous situation which, if not avoided, could
result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may
result in minor or moderate injury.

WARNING

Dangerous laser radiation

 Always be aware of the hazard level of the device to be

connected.

 Connect all optical fibers before switching on the radiation source.

 Switch off the laser source before disconnecting the optical fibers.

 Never look directly into the output of a laser source or into an

optical fiber connected to it.

 Always cover unused ports.

 Heed the normal precautions for working with laser radiation and

consider local regulations.

Chapter 1 Optical Spectrum Measurement

Safety information

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 7

Specific

laser safety

To find out the appropriate laser classification, associated wavelengths
and optical power levels, see:

– the label on the SFP module

– the “Specifications” chapter in the operating manual of the SFP

In accordance with the laser classification, read and follow the
instructions given in the laser safety warnings below.

Laser classification of the SFP transceiver in the SFP slot

WARNING

Invisible laser radiation

Laser radiation can cause irreparable damage to eyes and skin.

 Follow the laser safety regulations that apply in your area.

 Take note of the laser classification of the individual test module.

 Take note of the laser classification or hazard level of the device

under test.

 Make sure that you protect yourself and others from exposure to

laser radiation.

 Never look into optical outputs of devices or into the plug end

surfaces (free ends) of optical fibers.

 Always cover disconnected optical plugs or disconnected optical

cable connectors with protective caps.

 Always switch off the instrument and disconnect it from any fiber

optic cables before inspecting or cleaning the optical cable
connectors.

 Make sure that the fiber optic cables are disconnected from all

sources of radiation before they are cleaned or inspected and
ensure that they are not reconnected until cleaning or inspection
has been completed.

CAUTION

SFP laser classification
Use only class 1 laser products in the SFP slots.

However, the user is free to use any other SFP transceiver compatible
with the SFP Multi Source Agreement (MSA).

 In this case you must observe the laser classification of the

inserted SFP transceiver and its safety instructions!

Chapter 1 Optical Spectrum Measurement

Safety information

8 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Safety instructions for class 1 laser products

Safety instructions for class 1M laser products

Optical

surfaces

Dust and fingerprints can damage optical surfaces, particularly when
such surfaces are pressed together. To protect the instrument and
cables, every cable should be cleaned before it is connected to the
instrument. The optical connectors on the instrument should also be
cleaned regularly.

– Before cleaning the optical surfaces please pay attention to the

notes on safe handling of fiber optical cables and optical
connectors.

– To clean the optical connectors, remove the test adapters, dab the

end surfaces of the plug pins with cleaning tape and blow out the
test adapter using compressed air.

– Always fit protective caps to optical connectors that are not in use.

Ventilation

Please refer to the user manual of the MTS-5800 Base Unit for further
information.

Battery

operation

Please refer to the user manual of the MTS-5800 Base Unit for further
information.

CAUTION

Invisible laser radiation

Class 1 laser products are defined as safe in normal operation under
reasonably foreseeable conditions.

 Although the laser radiation from a class 1 laser product will not

harm eyes or skin, follow the general laser safety instructions (see
General laser safety instructions) to ensure maximum safety
when working with laser sources.

WARNING

Invisible laser radiation

Viewing the laser output of a class 1M laser product with certain
optical instruments (for example eye loupes, magnifiers,
microscopes) within a distance of 100 mm may pose an eye hazard.

 Do not expose eyes to the beam within a distance of 100 mm.

 Do not view the laser output with optical instruments.

 Follow the general laser safety instructions.

Chapter 1 Optical Spectrum Measurement

Start the COSA application

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 9

Start the COSA application

The fiber to be tested is connected to the optical connector.

1. Select the Fiber Optics button.

2. Select on the Home button.

3. To start the COSA application, select the COSA button.

Configuration

After connecting the fiber to be tested to the optical connector, you must
select the COSA module (see the Base Unit manual).

To configure the Base Unit in preparation for a COSA test on a fiber,
press the SETUP button. Two configuration procedures are available:

–

“Test Auto WDM mode”

In this case the parameters are selected automatically.

– “Manual configuration”

In this case you may define your own configuration.

Test Auto WDM

mode

1. Press the Test Auto WDM softkey.

Following configuration will automatically be set.

Parameter

Setting

Acquisition settings

Sweep Single

Measurements settings

Channel detection Permanent

Signal threshold Auto

Splitter compensation No

Results screen settings

Grid default = last value used

Alarms No

Table notes No

Unit nm

Chapter 1 Optical Spectrum Measurement

Configuration

10 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

In case of any parameter setting the Test Auto WDM softkey appears.

Manual

configuration

Instead of selecting the Test Auto WDM mode the configuration
parameters can be set manually.

The parameter to be modified must be selected by means of the direction
keys . The possible options then appear on the screen: make your
choice using the direction keys and . Alternatively, change the
parameters via the touchscreen.
The various parameters proposed are defined below.

Fig. 2 Test Auto WDM softkey (1)

1

Fig. 3 Configuration for optical spectrum measurements.

(The softkeys available depend on the grid settings.)

Chapter 1 Optical Spectrum Measurement

Configuration

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 11

Acquisition

parameters

Sweep

Number of sweeps

– In Statistics mode: between 2 and 1000

– In Drift mode: between 2 and 10000

Wait Period

The Wait Period parameter allows to enter a wait period prior to the
measurement start (in Statistics and Drift mode only).

s

Continuous There will be a measurement with refreshment of

the trace and real time display of results.

Single There will be one single measurement and the

display of its results.

Statistics In this mode, the number of samples concerned by

statistics must be entered (next parameter).

Drift For measuring power and wavelength over time.

The number of sweeps and the latency between
the sweeps need to be set.

NOTE

For Drift measurements a Grid needs to be defined and the Channel
Detection parameter is set to Grid.

Up to ... Increments of ...

1 minute 5 seconds

10 minutes 1 minute

60 minutes 5 minutes

24 hours 1 hour

Chapter 1 Optical Spectrum Measurement

Configuration

12 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Analysis

parameters

Channel

Detection

1

Fig. 4 Analysis parameters

NOTE

Those parameters are only linked to the current active fiber.

1. Attention: All modification of these parameters has immediate repercussions on the trace and entails the loss of
the measurement statistics.

Grid The grid serves as a detection reference: it must

therefore be ITU CWDM or Manual. The choice of
grid takes priority over the choice

Channel detection. For example, it is not possible to

choose Channel detection = Grid, if the option
selected for the grid is «None» or «Conventional».

Permanent Automatic detection of the channel on each

acquisition. In this mode the channels are always
detected without making a reference measurement.

Chapter 1 Optical Spectrum Measurement

Configuration

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 13

Signal threshold

1

Threshold for detection of channels (see "Channel detection threshold"

on page 26

).

Splitter

compensation

When the measurement is accessed by a splitter, it is possible to
compensate for the loss introduced by this element and to display the
value measured before or after it.

Go to the

Splitter compensation line to display a sub-menu proposing

the following options:

NOTE

At the end of an acquisition in permanent mode, it is possible to
create a grid on the basis of the channels detected. To do this, press
the softkey Adopt Grid in the

SETUP menu.

Auto – The threshold is determined automatically.

– To set to Auto: set threshold to -55 dBm.

Manual – Editable from -54.9 to +10 dBm.

– To modify values: use direction keys or

Edit

Number

.

NOTE

Modification of the parameters Channel selection and Signal

threshold will only modify the results if the WDM module present is

the one that was used for the acquisition.

Value1 Yes: activation of compensation and choice of its value

using the keys and : or the numeric keypad : from
1 to 30 dB (by increments of 1) or 1 to 99% (by
increments of 0.1%).

Unit Choice of compensation in dB or as a percentage of

the value measured.
For example, with a 10 dB splitter, the results will be

augmented by 10 dB. The trace will be offset upwards
by 10 dB. A channel measured at -30 dBm will be
displayed -20 dBm.

Chapter 1 Optical Spectrum Measurement

Configuration

14 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Parameters of

display and

analysis of the

results

Grid

1. Go to the Grid line to access the Grid sub-menu.

2. Select the Type line to see the different choices and modify them if

required.

Five possible types of grid are proposed with different corresponding
values, some of which are fixed or non-applicable, others editable.

The type Conventional and the option None do not give access to the
parameters of the Grid sub-menu; the others give access to certain
options, as shown in the table of the figure.

Fig. 5 Display parameters

NOTE

Those parameters are valid for all traces present on the screen.

Chapter 1 Optical Spectrum Measurement

Configuration

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 15

Alarms

When Channel Selection is positioned on Grid, it is possible to activate
an alarm system. This system is based on a system of thresholds. Any
measurement results that exceed these thresholds are displayed in red
in the table, and the icon

appears at the top right of the screen. If all

the results are within the thresholds (no result is in red), the icon
becomes .

 To activate the alarm system, go to the Alarms line and select

Active.

None Conventional ITU CWDM Manual

Grid name

– – Editable Editable

ITU standard

– – G.694.2 N/A

First ITU channel
(with display in nm)

– – Editable, from 1271 to 1611 nm,

by increments of 20 nm

N/A

Channel spacing

– – 20 nm N/A

Number of
channels

– – Editable, from 1 to 19 by

increments of 1

Editable from
1 to 256

Define channels

– – Sub-menu accessible to display the

wavelengths of each channel, name the band,
and name each channel.

NOTE

The maximum real number of channels for ITU grids depends on the
value selected for the first channel and the spacing between the
channels.

NOTE

It is possible to display the grid with the View Grid softkey. A table
appears showing the channel number, the name of the channel, the
reference wavelength and the alarm thresholds for delta frequency,
minimum power and maximum power.

Chapter 1 Optical Spectrum Measurement

Configuration

16 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Thresholds can then be set (using the direction keys or numeric keypad),
to global level or to the level of each channel:

Global alarms

Channel alarms

Fig. 6 Alarm parameters

Number of channels Yes/No

Delta channel power

1

1. Max. acceptable variation between max. power and min. power on all channels

“No” or threshold modifiable from

0.1 to 60 dB (for “No” set threshold to Min)

Composite power

2

2. Maximum composite power

“No” or threshold modifiable from -59.9 dBm
to +20 dBm (for “No” set power to Min)

Max channel offset

1

1. Wavelength drift. Selection of the alarm on the basis of the value of Delta Offset

Yes/No

Min channel power

2

2. The values are then defined in P Min

Yes/No

Max channel power

3

3. The values are then defined in P Max

Yes/No

Channel Number From «001» to the max. number of

channels.

Channel Value Display of the wavelength of the channel

number selected

Delta Offset

4

4. Delta of frequency

From 0 to 10 nm

P Min

5

5. Minimum power

From -55 dBm to P Max

P Max

6

6. Maximum power

From P Min to +10 dBm

Chapter 1 Optical Spectrum Measurement

Configuration

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 17

Notes Table

Here the display can be configured and it can be specified whether or not
it is possible to enter a note for each channel (see

"Table notes" on

page 32

):

Unit

Here the units of the x axis can be selected:

Table Content

Here the table content can be selected.

Manual Allows to manually enter a note for each channel in

the results table.

No Notes function is disabled.

nm Wavelength in nm

THz Frequency in THz

Fig. 7 Unit parameters

Fig. 8 Table Content parameters

Chapter 1 Optical Spectrum Measurement

Configuration

18 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Link

Description

Define the parameters in the Link Description menu and add a
comment.

Fig. 9 Link Description parameters

Chapter 1 Optical Spectrum Measurement

Configuration

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 19

File

Configuration

In the File Configuration menu, the memory management is set.

Fig. 10 File Configuration parameters

Chapter 1 Optical Spectrum Measurement

Acquisition

20 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Acquisition

 To start a measurement press the START key.

The COSA-4055 will scan over the entire wavelength range and the
measurement result will be displayed in graphical and tabular format.

Trace display

functions

By pressing the RESULTS button the results window is displayed.

The Trace/Table key offers a choice from the following displays:

Trace Main display of the trace with a single line of the table

at the foot of the page.
See

“Result display” on page 21

Table

Display of the table only.
See

“Table display” on page 29

Trace + Table

Display of trace, reduced in size, followed by a table
of results.

See

“Trace & Table display” on page 34

Chapter 1 Optical Spectrum Measurement

Result display

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 21

Result display

To display the trace only select Trace in the Trace/Table softkey.

Overview

1. Filename (only if file was stored)

2. Mini-trace

3. Number of acquisition

4. File settings:

The displayed parameters depend on the settings in the File
settings menu. Following parameters may be displayed:
[Fiber Id] [Fiber Number] [Cable Id]

5. Trace results associated with cursors A and B:

– A, B: Wavelengths and power at point of trace referenced by

cursors A and B

– A-B: Wavelength and power difference between cursors A and B

6.

Alarm result (see “Alarms” on page 15).

7. Trace/Table selection

8. Channel number

9. Trace with markers

10. Table of results (see "Table display" on page 29).

Fig. 11 Example of result display (Trace only)

23 5 6

98

1

10

4

7

Chapter 1 Optical Spectrum Measurement

Result display

22 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

The trace represents power (in dBm) as a function of frequency (in THz)
or wavelength (in nm).

The softkey give access to following functions and menus:

NOTE

If several acquisitions are performed, the trace displayed is the one
corresponding to the last acquisition.

Trace
Channel

Allows to select a trace or a channel (by means of

the arrow keys). If only one trace is displayed, this
softkey is available but does not allow to select
Trace.

– Trace: pressing any arrow key selects another

trace (at least two traces must be available).

– Channel: pressing the and

keys selects

another channel.

Zoom
Shift

This softkey is only available if the trace is
displayed.

– Zoom: pressing the arrow keys zooms the axis

according to the selected cursor.

– Shift: pressing the arrow keys moves the trace.

Cursor A
Cursor B

This softkey is only available if the trace is
displayed.

Pressing the softkey selects the cursor: A, B, A+B.

Trace
Table

Pressing the softkey offers a choice from the
following displays:

– Trace: Main display of the trace with a single

line of the table at the foot of the page.

– Trace & Table: Display of trace, reduced in size

but followed by 5 to 8 lines of the table of results.

– Table: Display of the table alone.

Table Content Gives access to table related functions.

Advanced Gives access to further trace related functions.

Chapter 1 Optical Spectrum Measurement

Result display

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 23

Using the

cursor

By means of the two cursors A and B following functions are available:

– displaying the power level at the cursor position

– measuring delta power and total power between two points

– zooming and shifting the trace according to the cursor positions

Selecting a cursor

 Press the Cursor A/Cursor B softkey to select a cursor: A, B, A+B.

A selected cursor is displayed as a solid line, a deselected cursor is
displayed as a dotted line.

Displaying the y-

axis cursor

1. Press the Advanced softkey to open the menu.

2. Press the Cursor X/Cursor Y softkey to select Cursor Y.

Moving the cursor

The cursor can be moved on the trace from one measurement point to
the next or by jumping from one channel to the next (both forward and
backward).

To move the cursor on the trace:

1. Press the Cursor X/Cursor Y softkey to highlight the tab and to

select a cursor if needed.

2. Press the or

key to move the cursor backward or forward.

If both cursors are selected both cursors will be moved in parallel.

To jump from one channel to the next:

1. Press the Trace/Channel softkey to highlight the tab.

2. Press the or

key to jump one channel backward or forward.

The Zoom

function

Both x- and y-axis can be zoomed.

When zooming the x-axis the area to be zoomed is defined by the
selected cursor and its position:

– If only one cursor is selected, the cursor position is kept while the

areas left and right to the cursor are zoomed.

– If both cursors are selected the center between both cursors is kept.

To zoom the x-axis:

1. Select a cursor or both cursors and move them to the desired

position.

2. Press the Zoom/Shift softkey and select Zoom.

3. Press the or

key to reduce or enlarge the x-axis.

Chapter 1 Optical Spectrum Measurement

Result display

24 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

To zoom the y-axis:

Zooming the y-axis is independent from the cursor settings.

1. Press the Zoom/Shift softkey and select Zoom.

2. Press the or

key to reduce or enlarge the y-axis.

The Shift

function

The shift functions moves the trace and keeps the cursor on this
positions. Shifting the trace is independent from the cursor settings.

To shift the trace:

1. Press the Zoom/Shift softkey and select Shift.

2. To shift the trace left or right: press the or

key.

3. To shift the trace up or down: press the or

key.

The

measurement

function

By setting both cursors two values can be measured:

– Difference Power (A-B): the difference power between the two

cursor positions

– Total Power: the total power between the two cursor positions

– Delta power: slope and difference power between the first and the

last detected channel within the area marked by the cursors.

To measure the Difference Power:

 Set the cursors to the desired positions.

The difference power is displayed in the trace result field above the
diagram (A-B).

To measure the Total Power:

1. Set the cursors at the desired positions.

2. Press the softkeys Advanced, Measure A<->B and
Total Power A<->B.

The space between the trace and the two cursors is greyed out and
the power is displayed.

Chapter 1 Optical Spectrum Measurement

Result display

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 25

3. Pressing the key Total Power A<->B a second time removes the

result of the total power measurement.

To measure the Delta Power:

1. Set the cursors to the desired positions. At least two detected

channels must be between the cursors.

2. Press the softkeys Advanced, Measure A<->B and

Delta Power A<->B.

The first and last maximum are linked by a solid line. The slope in
[dB/nm] and the difference power in [dB] are stated below the line.

Fig. 12 Example of Total Power measurement

Fig. 13 Example of Delta Power measurement

Chapter 1 Optical Spectrum Measurement

Result display

26 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Channel detection

threshold

On the trace, some peaks corresponding to noise could be mistaken for
channels. It is therefore necessary to fix a power threshold level: only
peaks that exceed this threshold will be considered as channels and
included in the table of results.

To display or modify this threshold, press the

SETUP key, then select

Signal threshold. Modify the value to position it on Auto1 or fix a

threshold value.

When set to Auto, the signal threshold is calculated from the actual trace.

Display of a grid

The display window of the trace can include a grid to facilitate verification
of the position of the channels. Several grids are possible (see the
chapter

"Parameters of display and analysis of the results" on page 14).

1. The “Auto” value is obtained by continuing to reduce the value of the threshold be­low the minimum value of -54.9 dBm

Chapter 1 Optical Spectrum Measurement

Result display

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 27

Multiple traces

(Overlay)

The Overlay functions allows you to display multiple traces in one view
and to compare them.

To add a new trace:

1. Press the Advanced softkey, then Overlay.

2. Press the Set New Trace softkey.

A copy of the previously active trace is added to the display. A new
number is added to the trace tab line.

3. Start a new measurement or open the File menu and select a trace

to be loaded.
The selected trace is overwritten by the new one.

1. New trace (active trace in green)

2. Trace number (active trace in orange)

To remove a trace:

1. Press the Trace softkey and use the arrow keys to select a trace.

2. Press the Remove Current Trace softkey.

NOTE

The Overlay function is not available in Drift mode.

Fig. 14 Displaying multiple traces

12

Chapter 1 Optical Spectrum Measurement

Result display

28 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Adjusting the

y axis

To compare curves the y axis of the curves can be adjusted by the
Y Reset/Y Shift/Y Exact softkey.

 Press the softkex to select one of he following settings:

– Y Reset: All traces are on the the same level at the intersection

with the active cursor.

– Y Shift: Each trace is shifted 5 dB from the other.

– Y Exact: The traces displayed are on the same position

according to their injection level.

Displaying the

difference of two

curves

A difference can be build from two curves.

1. Display the two curves.

2. Press the Advanced softkey, select Overlay and then
2 Curves Diff.

The difference curve is displayed as a new trace in the diagramm.

Fig. 15 Difference of two curves (1)

1

Chapter 1 Optical Spectrum Measurement

Table display

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 29

Table display

The table may be displayed in a single line, on half of the screen or the
whole screen as a function of the Trace/Table key.

Overview

1. Mini-trace

2. Number of acquisition

3. File settings:

The displayed parameters depend on the settings in the File
settings menu. Following parameters may be displayed:
[Fiber Id] [Fiber Number] [Cable Id]

4. Comment:

The comment can be entered in the Setup menu.

5. Measurement settings:

– Res: Resolution

– Th: Threshold

6. Measurement settings and results:

– Detect.: Detection Grid/Permanent

– Splitter: Splitter Compensation Yes/No

– Nb: Number of channels detected/available

– Pcomp: Composite power of all channels

Fig. 16 Example of result display (Table only)

47

11 10

51 682 3

9

Chapter 1 Optical Spectrum Measurement

Table display

30 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

7. Direction:
Loc A and Loc B will be used as default. If Origin and
End Location are set in the Setup menu, these settings will be used

instead.

8. Date and time of measurement

9. The Advanced tab is disabled in the Table only view.

10. Selected channel

11. Table contents:

For further details see following sections "Table contents" on

page 30, and "Table statistics" on page 31.

Table contents

According to the choice made in the SETUP menu, the table of results
may include:

– either a line for each channel detected (if Channel Selection =

Permanent)

– or a line for each graduation, (if Channel Selection = Grid and a grid

is selected)

In the absence of statistics (see

"Analysis parameters" on page 12) the

parameters given for each channel are as following:

Channel The number of the channel

Wavelen. – Absolute mode: the frequency or the wavelength

of the selected channel in [THz] or in [nm]

– Relative mode: the frequency or wavelength

difference to the reference channel

Offset/Spacing The column depends on the Channel detection

setting:

– Grid: Offset shows deviation from Grid wave-

length in [GHz] or in [nm]

– Permanent: Spacing shows spacing between the

channels in [THz] or in [nm]

Level – Absolute mode: the level of the channel in [dBm[

– Relative mode: the difference level to the refer-

ence channel in dB

For the COSA-4055 this parameter indicates the peak
channel power level.

P/Pcomp The ratio between the power of the channel and the

composite power in [%].

Chapter 1 Optical Spectrum Measurement

Table display

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 31

Table statistics

When selecting the Statistics measurement mode and multiple
acquisitions are performed, statistics are calculated on the results.

To display these results in the table:

 Press the Table Content key, then Statistics and set Stat. to On.

Different Statistics keys are available to choose the content of the table
display for each channel.

The following statistics can be selected:

When selecting Wavelen. or Level the display will give current value,
average value, max. value, min. value and standard deviation, or delta
between min. and max. (selectable).

When selecting Mixed the table will show a mixture of statistical results:
current, min. and max of wavelength or frequency, and current, min. and
max of the power levels.

Channel sort

The channels can be classified in the table in ascending order of
wavelength (or descending order of frequency, depending on the
selected unit) or level.

To modify this order:

1. Press the Table Contents key, then Sort.

2. Press Wavel. Sort or Level Sort.

Successive addressing of channels according to the sort type
selected

On the trace and in the table, it is possible to move the cursor from one
channel to the next in the selected sort order. To do this:

1. Use the key Cursor A / Cursor B to choose the cursor A or B to be

used on the trace.

2. Press the Channel key.

3. Press and to move the cursor to the following or preceding

channel:

Wavelen. Wavelength or frequency statistics

Level Power statistics

Mixed Wavelength (resp. frequency) and power statistics

Chapter 1 Optical Spectrum Measurement

Table display

32 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Table notes

A note of not more than 40 characters, entered by the user, may be
associated with each channel.

To enter a note:

1. In the table, select the channel.

2. Press the Table Contents key, then press Notes.

3. Enter the text of the note and confirm its creation.

4. Press the Exit key to return to the previous menu if necessary.

Displaying relative results

By default, the table gives the results in absolute values. To obtain these
results in relative values with respect to a reference channel:

1. Press the Table Contents softkey, then Relative/Absolute to select

Relative.

2. Move the cursor on to the channel that is to serve as the reference.

3. Press the Set Ref Channel softkey. The results are recalculated

with respect to this channel of reference.

NOTE

Each note is associated with a channel. Consequently, if the channel
is deleted, the note the will be deleted too.

NOTE

These notes appear in the table only if they have been validated in the

SETUP menu on the Table notes line (Result screen). Similarly, this

option must be confirmed in order to be able to create a note.

NOTE

The table notes are not stored in the measurement results.

Chapter 1 Optical Spectrum Measurement

Table display

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 33

Result colours

When Channel Selection is positioned on Grid and the alarm system is
activated, measurement results that exceed the defined thresholds are
displayed in red, results within the thresholds are displayed in green.

(Additionally the icon indicates that at least one result exceeds the
threshold and if all results are within the thresholds (no result is in red),
the icon becomes . See

"Alarms" on page 15.)

1. Not all results are in the thresholds.

2. Results within the thresholds are displayed green.

3. Results outside the thresholds are displayed red.

Fig. 17 Displaying multiple traces

2

1

3

Chapter 1 Optical Spectrum Measurement

Trace & Table display

34 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Trace & Table display

The Trace & Table display is a combination of the trace only and table
only displays.

For explanations about the trace functions please see

“Result display” on

page 21

, for explanations about the table functions please see “Table

display” on page 29

.

Drift measurement

The COSA-4055 modules provide a Drift measurement application to
perform multiple measurements and display the recorded results in a
graphical format (trace) over the time.

This can be used to monitor the drift of power and wavelength of optical
systems or components. This is important to measure the drift of non
temperature stabilized transmitter in CWDM networks.

Fig. 18 Example of Delta Power measurement

NOTE

A Drift measurement can only be done at predefined wavelengths or

frequencies, for this reason a reference Grid needs to be defined and
the Channel Detection parameter is set to Grid.

Chapter 1 Optical Spectrum Measurement

Drift measurement

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 35

The following parameters need to be set for Drift measurements:

All channels defined by the channel Grid can be monitored
simultaneously with the drift application. To show the monitored
measurement parameter use the Trace/Channel/Drift button in the
result screen.

This button has a toggle function with the following selections:

Activating the Drift display will show the following screen:

Sweep Set to Drift.

Number of Sweeps Defines the number of sweeps (1 to 10.000).

Wait Period Defines the time between the measurements.

NOTE

Wait period specifies the time between start of one measurement and
start of the next measurement and includes the instrument
measurement time

Trace In Drift mode only one trace can be displayed.

Thus, Trace can not be selected.

Channel In Channel mode the up/down cursor change

the channel to be displayed over time.

Drift Activates the drift display showing the selected

parameter over time.

Fig. 19 Example of drift measurement, figure shows

wavelength drift over time

Chapter 1 Optical Spectrum Measurement

Drift measurement

36 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

In the Drift display the measurement result is shown in a graphical format
(trace over time / scans) and a tabular format. The table shows the
following parameters:

All Zoom and Shift functions are available in Drift mode.

By using the cursor A it is possible to get access to each measured data
point. The Start value as well as the actual cursor position including the
time information is shown in the blue field of the table.

Wavelen. Level Description

Channel Channel

Number of the displayed channel.

Wavelen. (nm) Wavelen. (nm) Wavelength or Frequency of the displayed

channel.

L Ref (nm) Level (dBm) Reference value of wavelength or power.

L Avg (nm) P Avg (dBm) Average value of wavelength or power.

L Min (nm) P Min (dBm) Minimum of wavelength or power.

L Max (nm) P Max (dBm) Maximum of wavelength or power.

Sdev L (nm) or
Delta

Sdev P (dBm) or
Delta

Standard deviation or delta (min/max) of
wavelength or power.

NOTE

If the channel power drifts to a power level below the channel
detection threshold, the measurement will indicate

“No Signal” in the

bar above the table.

Chapter 1 Optical Spectrum Measurement

Reports

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 37

Reports

Fast Report

Fast Report generates a report which is stored in file system.

 To change the Fast Report parameters, select the Results button.

Fig. 20 Fast Report (1)

Fig. 21 Fast Report parameters

1

Chapter 1 Optical Spectrum Measurement

Reports

38 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

File system

report

 To view the reports on the file system, select the File button.

Fig. 22 Report from file system

Chapter 1 Optical Spectrum Measurement

File management

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 39

File management

Storing OSA

measurements

If Auto store has been selected, then results will be saved automatically.
If not, or if you want to save the results under another name, directory
etc.:

1. Click on FILE key.

2. Select Setup with the Setup/Explorer key.

3. Modify the parameters you want.

4. Click on Store Trace.

The trace is saved with the extension “OSA“.

Recalling
OSA files

Once an OSA file has been stored, recall it using the Explorer:

1. Select Explorer with the key Setup/Explorer.

2. Using directions keys, select the directory and then the file to open.

3. Click on Load.

4. Click on View Tace(s) or Load Trace + Config.

The selected file is opened.

For further informations on file management, please see the chapter “File
Management” in the Base Unit user manual.

Chapter 1 Optical Spectrum Measurement

Recycling information

40 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

Recycling information

Viavi

Environmental

Management

Program

Superb performance and high quality have always characterized Viavi
datacom and telecom measurement technology products. In this same
world-class tradition, Viavi has an established, proactive program of
environmental management.

Environmental management is an integral part of Viavi’s business
philosophy and strategy requiring the development of long-term,
productive solutions to problems in the key areas of economics,
technology, and ecology.

A systematic environmental management program at Viavi is essential in
regard to environmental policy and enhances cooperation between
ourselves and our business partners.

The program

considers

Product design and manufacture Environmental restrictions and
requirements are taken into account during planning and manufacture of
Viavi products. This attention ranges form the raw materials and finished
components selected for use and the manufacturing processes
employed, through to the use of energy in the factory, and right on up to
the final stages in the life of a product, including dismantling.

Hazardous materials

Viavi avoids or uses with care any hazardous or dangerous material in
themanufacturing process or the end product. If the use of a dangerous
material cannot be avoided, it is identified in product documentation and
clearly labeled on the product itself.

Packaging materials

Preference is given to reusable or biodegradable singlesubstance
packaging materials whenever possible.

Environmental management partnerships

Viavi encourages our customers and suppliers who take this
responsibility seriously to join Viavi in establishing their own
environmental management programs.

Chapter 1 Optical Spectrum Measurement

Recycling information

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 41

Recycling used products

This product complies with the European Union Waste Electrical and
Electronic Equipment directive (WEEE), 2002/96/EC. This product
should not be disposed of as unsorted municipal waste and should be
collected separately and disposed according to your national regulations.

In the European Union, all equipment purchased from Viavi after 2005­08-13 can be returned for disposal at the end of its useful life. Measuring
systems affected by this can be recognized by the symbol on the right of
a crossed-out trash can and a black bar. This symbol can be found either
on the device or in the accompanying documents.

Contact your local Technical Assistance Center (TAC) for return and
collection services available to you.If you would like specific information
about the Viavi Environmental Management Program, please contact us
at: www.viavisolutions.com

RoHS

The following pages provide with respect to Chinese Requirements
information with regard to the location of restricted hazardous
substances within this equipment.

As measuring equipment this equipment is excluded from the European
regulations for the restriction of hazardous substances (RoHS).

Chapter 1 Optical Spectrum Measurement

Recycling information

42 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

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Chapter 1 Optical Spectrum Measurement

Recycling information

MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01 43

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Chapter 1 Optical Spectrum Measurement

Recycling information

44 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01

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Viavi product specifications and descriptions in
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© 2016.01

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User Manual MTS ⁄ T-BERD 5800 COSA-4055, BN 3071/98.21, 2016.01, English