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Why Test for Chromatic Dispersion and Polarization Mode Dispersion?

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Why Test for Chromatic Dispersion and Polarization Mode Dispersion?

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  • Author: Mike Andrews, Francis Audet
Most system providers find original ways to help dealing with CD to some extent, but they cannot completely mitigate this challenge. For example, the native OC-192/STM-64 transmission format is non-return-to-zero transmission. If this were to be used at OC-768/STM-256, the CD tolerances would be such that compensation would be required after 6 to 7 km of G.652 singlemode optical fiber-which is not a viable solution. On the other hand, no standards exist to define how 40 Gbit/s should be implemented; hence, every system provider has its own recipe, at very variable costs but also variable CD tolerance levels.

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