CPC H04B 10/0777 (2013.01) [H04B 10/07957 (2013.01); H04B 10/2912 (2013.01); H04B 10/071 (2013.01)] | 20 Claims |
1. An apparatus, comprising:
a remote optically pumped amplifier (ROPA) configured to amplify a first optical signal of a first optical path configured to propagate the first optical signal in a first direction; and
a set of one or more first elements configured to extract a first optical supervisory signal from the first optical path before an input to the ROPA, a set of one or more second elements configured to extract a second optical supervisory signal from the first optical path after an output of the ROPA, and a set of one or more third elements configured to insert the first optical supervisory signal and the second optical supervisory signal into a second optical path configured to propagate a second optical signal in a second direction.
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