VIAVI T-BERD/MTS COSA-4055 CWDM Optical Spectrum Analyzer Module

Handheld CWDM optical spectrum analyzer module covering 1260 to 1625 nm with full spectral trace and wavelength/power results in under 4 seconds.

Operating modes: CWDM, drift
Display modes: Graph (trace + overview), CWDM table and graph + table
Measurement parameters: Channel #, power, wavelength, drift

Datasheet

Overview

The VIAVI COSA-4055 is a coarse wavelength division multiplexing (CWDM) optical spectrum analyzer module for the T-BERD/MTS-2000, T-BERD/MTS-4000 V2, T-BERD/MTS-5800 and OneAdvisor-800 platforms. It provides OSA functionality in a handheld form factor as a lower-cost alternative to a standard bench OSA, and is intended for installing, maintaining and upgrading metro/access links and CWDM systems.

The module measures the wavelengths and power levels of CWDM channels and displays the complete spectrum, with tabular power and wavelength results, zoom and marker functions. It supports the ITU-T G.694.2 CWDM wavelength grid as well as customized grids, and is used to check parameters such as transmitter output power, receiver input power and central wavelengths for multivendor compatibility according to ITU-T G.695.

Drift measurement

Because CWDM transmitter lasers are uncooled, temperature variations can shift central wavelength and power level. A built-in drift test application records power and wavelength over a user-defined time and presents the results in graphical and numerical form.

Ease of use

An Auto-Test mode identifies WDM channels, selects the appropriate wavelength range, and provides auto scaling and pass/fail qualification against pre-defined, user-settable limits. Statistical, continuous or single evaluation with automatic storage is available.

SFP bay

An integrated SFP slot hosts up to two SFP CWDM transceivers, which can simulate CWDM transmitters to test insertion loss per wavelength and end-to-end continuity across multiplexers, demultiplexers and OADMs.

Key Features

Field interchangeable single slot size module
Full CWDM wavelength range 1260 to 1625 nm
Complete spectral trace and wavelength/power results in under 4 seconds
8 nm minimum channel spacing
ITU-T G.694.2 CWDM wavelength grid and customized grids
Power and wavelength drift test application
Compliant with ITU-T G.695 and G.694.2 standards
Zoom and marker functions
Automatic channel detection
Pass/Fail analysis against user-settable limits
One-button Auto-Test mode
Slots for up to two SFP CWDM transceivers
Can be combined with CWDM OTDR modules

Specifications

Modes

Operating modes	CWDM, drift
Display modes	Graph (trace + overview), CWDM table and graph + table
Measurement parameters	Channel #, power, wavelength, drift

Spectral Measurement Ranges

Wavelength range	1260 to 1625 nm Product web page states 1260 to 1630 nm; datasheet value used
Wavelength accuracy	±0.5 nm At 23°C ±5°C
Readout resolution	0.001 nm
Resolution bandwidth FWHM	Typ. 4 nm At 23°C ±5°C
Minimum channel spacing	8 nm Two channels at equal power level

Power Measurement Ranges

Dynamic range	–55 to +10 dBm
Noise floor RMS	−55 dBm
Absolute accuracy	±0.5 dB Typical at −6 dBm at CWDM wavelength grid including PDL
Linearity	±0.1 dB −45 dBm to +5 dBm, at 23 °C
Readout resolution	0.01 dB
Scanning time	< 4 s Product web page states 4s

Optical Port

Input port	SM/PC
Switchable optical adapters	FC/SC/LC and ST
Optical return loss	>35 dB
Total safe power	+15 dBm

SFP Bay

SFP transceivers	Can host up to two SFP transceivers Transceivers not included

General

Weight	0.35 kg (0.7 lb)
Dimensions (W x H x D)	128 x 134 x 40 mm (5.04 x 5.28 x 1.57 in)
Operating temperature	–5 to +50°C (23 to 122°F)
Storage temperature	–20 to +60°C (–4 to 140°F)

Compatible Platforms

Host platforms	T-BERD/MTS-2000, -4000 V2, -5800 and OneAdvisor-800

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

Performance verification in metro access networks
Maintenance and troubleshooting of CWDM networks
Upgrade of CWDM networks
Spectral and drift testing of CWDM sources
Mux/demux and OADM channel power verification
Link continuity and insertion loss per wavelength testing

Included

SC switchable adapter (mounted on instrument)
FC switchable adapter (spare part)

Options & Accessories

Option	Description
2301/02	COSA-4055 CWDM analyzer with SFP bay — Each COSA module comes with a SC switchable adapter mounted on instrument and a FC switchable adapter as spare part
EOFS100	Optical fiber trace for post-analysis — Application software
EOFS200	Optical fiber trace for cable acceptance report — Application software
2155/00.32	Switchable ST adapter
2155/00.05	Switchable FC adapter
2155/00.06	Switchable SC adapter
2155/00.07	Switchable LC adapter