How to perform in-service Pol-Mux OSNR measurements with your FTBx-5255 optical spectrum analyzer
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Multi-User, Multimode, Multiplatform Software Application
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Optical spectrum analyzers — FTBx-5245/5255 Lab


Highly accurate, easy-to-use intelligent optical spectrum analyzers (OSAs) for analysis of CWDM and DWDM networks.

Technical information

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Key features

  • Ideal for field and lab: compatible with FTB-2, FTB-2 Pro, FTB-4 Pro and LTB-8 platforms
  • Flexibility to analyze WDM, EDFA, drift, spectral transmittance, and Fabry-Perot and DFB lasers
  • Wide range of measurements (SMSR, FWHM spectral width, 20 dB linewidth)
  • One-button operation for easy setup and automatic Measurement


The FTBx-5245/5255 is an easy-to-use OSA offering a wide range of measurement modes tailored to the needs of users working in R&D and manufacturing.

Powerful features

Laser Analysis

Make sure that your transmitters are within specifications. With the DFB Laser Analysis feature, you can characterize a DFB laser source for central wavelength, peak power, bandwidth, SMSR, and much more.

Automatically characterize Fabry-Perot lasers for central wavelength, RMS width and full-width half-max (FWHM).

Accurate Spectral Transmittance

With the advent of larger spectral content through the implementation of 100G+ signals, knowing the bandwidth of a given filter is critical. The Spectral Transmittance software feature compares the filtered wavelength to the nominal one, showing insertion loss, channel isolation and bandwidth at different power levels.

OSNR Measurements from 10G to 400G

The FTBx-5245/5255 family offers the most comprehensive set of OSNR measurement methods in the industry, from the IEC 61280-2-9 method for 10G signals, all the way up to IEC 61282-12 method for coherent signals, as well as in-service approaches for 100G+ signals on live networks.

All-in-one OSA covering all spectral testing applications

The new FTBx-5255 is the only OSA on the market to address all applications in a single module:

  • High-speed DWDM, with OSNR measurements from 10G to 400G, including In-service Pol-Mux OSNR
  • CWDM spectral analysis
  • Spectral analysis of pluggable transceivers (CFP, XFP, etc.) on the O-band, 1300 nm region, as well as L-band transceivers

SCPI Commands

It is possible to control the OSA remotely with SCPI commands for the WDM, Fabry-Perot, DFB and spectral transmittance modes.

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100G/400G Testing Guide

Reference Guides

Find out everything you need to know with our 100G/400G testing guide, which provides an overview of high-speed technology, and detailed information on both line-side and client-side 40G/100G system testing, lab qualification, commissioning and turn-up.

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Last updated: 2017-09-18

Last updated: 2017-09-01

This app note describes OSNR measurement methods, both the state-of-the-art methods used in today’s networks and why classical measurement methods no longer constitute workable solutions. It explains EXFO’s in-service Pol-Mux OSNR method, the conditions under which reference-based OSNR measurement is sound and how valid reference trace measurements are generated.

Last updated: 2017-09-01


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