Low Cost Secure Submarine ROADM Branching Unit Using Bidirectional Wavelength-Selective Switch

摘要

A reconfigurable optical add/drop multiplexer (ROADM) unit includes a first optical circulator coupled to a first terminal; a second optical circulator coupled to a second terminal; a third optical circulator coupled to a third terminal; a fourth optical circulator coupled to a fourth terminal; a first wavelength-selective switch (WSS), coupled to the first, second, and third optical circulators; a second WSS coupled to the first, second, and fourth optical circulators, wherein the first and second WSSes are bidirectional operated; a first 1:2 coupler positioned between the first circulator and the first and second WSSes; a second 1:2 coupler positioned between the second circulator and the first and second WSSes.

主权项

1. A system for communicating in a submarine transmission network, comprising:
first, second, third and fourth bi-directional terminals; and a reconfigurable optical add/drop multiplexer (ROADM) unit coupled to the terminals, including:
a first optical circulator coupled to the first terminal;a second optical circulator coupled to the second terminal;a third optical circulator coupled to the third terminal;a fourth optical circulator coupled to the fourth terminal;a first wavelength-selective switch (WSS), coupled to the first, second, and third optical circulators;a second WSS coupled to the first, second, and fourth optical circulators, wherein the first and second WSSes are bidirectional operated;a first 1:2 coupler positioned between the first circulator and the first and second WSSes;a second 1:2 coupler positioned between the second circulator and the first and second WSSes.