REDUNDANCY PROTECTION FOR RECONFIGURABLE OPTICAL ADD/DROP MULTIPLEXING (ROADM) BRANCHING UNIT

摘要

Aspects of the present disclosure describe systems, structures and methods providing fully reconfigurable optical add-drop multiplexing (ROADM) that provide redundancy protection against any two (2) simultaneous wavelength selective switch (WSS) failures with only four 2×1 WSS structures for both Eastbound and Westbound traffic, while not requiring bidirectional operation of the WSS structures.

主权项

1. A reconfigurable optical add/drop multiplexing (ROADM) system comprising:
first, second, third and fourth inputs and first, second, third and fourth outputs; first, second, third and fourth wavelength selective switches (WSS); first and second 1×3 optical splitters; first and second 1×2 optical splitters; first, second and third 2×2 cross switches; and first and second 1×2 switches; wherein the inputs, outputs, WSS, splitters, cross-switches, and switches are configured such that
the first 1×3 optical splitter having an input connected to the first input of the ROADM, a first output connected to the first output of the ROADM, a second output connected to a first input of the first WSS, and a third output connected to a first input of the first cross-switch;the second 1×3 optical splitter having an input connected to the fourth input of the ROADM, a first output connected to a second input of the second cross-switch, a second output connected to a second input of the fourth WSS, and a third output connected to the fourth output of the ROADM;the first 1×2 optical splitter having an input connected to the second input of the ROADM, a first output connected to a second input of the first WSS and a second output connected to a first input of the second cross-switch;the second 1×2 optical splitter having an input connected to the third input of the ROADM, a first output connected to a second input of the first cross-switch and a second output connected to a first input of the fourth WSS;the first cross-switch having a first output connected to a first input of the second WSS and a second output connected to a first input of the third WSS;the second cross-switch having a first output connected to a first input of the second WSS and a second output connected to a second input of the third WSS;the first WSS having an output connected to a first input of the first 2×1 switch;the second WSS having an output connected to a first input of the third cross-switch;the third WSS having an output connected to a second input of the third cross-switch;the fourth WSS having an output connected to a second input of the second 2×1 switch;the third cross-switch having a first output connected to a second input of the first 2×1 switch and a second output connected to a first input of the second 2×1 switch;the first 2×1 switch having an output connected to the second output of the ROADM; andthe second 2×1 switch having an output connected to the third output of the ROADM.