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Re: [802.3_100GNGOPTX] 802.3_100GNGOPTX Multi Path Interference experiments


Dear all,

Here’s a few snapshots (literally) of multi path interference in a simple single mode link. It was a quick experiment, with a well isolated instrument grade laser (impervious to reflections) so that just coherent multipath effects within the low loss link are captured.  It demonstrates:

       Coherent Multi-path Interference penalty is real.

       Near worst case penalties are observed in practice (despite a misleadingly reassuring low probability of occurrence).

       Very slowly varying phenomena (minutes).

      FEC can’t fix it.

      EQ can’t fix it.

       Need to budget for worst case.



Best wishes






Attachment: MPI-optx-expts-2013mar19.pdf
Description: MPI-optx-expts-2013mar19.pdf