What is Optical Return Loss and what is an allowable amount?
Optical return loss is the amount of light reflected back toward the source from a interconnect point. Excessive return loss can disrupt the source and degrade overall speed/performance of the system. To know what is allowable system details are needed. Having said that, typically return loss for SM is -50 dB to -55 dB, and for high speed MM OM3 systems it’s -30 dB to -35 dB. Legacy OM1 MM systems typically don’t have a return loss limit.
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