Testing Roadm Networks - Viavi 8100 V2 Series User Manual

Portable, modular platform designed for the construction, validation and maintenance of optical fiber networks

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Table of Contents

Chapter 8 Optical Spectrum Measurement

Testing ROADM networks

In ROADM networks, each channel may traverse different routes, optical amplifiers, and

add-drop filters, resulting in different OSNR for each channel. Conventional OSA

measurements are unreliable, as they indicate OSNR values that are too high: up to

10dB above the true OSNR. Using the in-band OSNR method (I-OSNR) of OSA-500R,

OSA-500RS or OSA-110R will provide the true OSNR value in ROADM based networks.

ROADM network test

With OSA-500R, OSA-500RS or OSA-110R, it is possible to measure the "true" in-band

OSNR using the polarization nulling technique.

Here is a test setup for in-band OSNR testing.

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