Patent ID: 9559776
Date: 2017-01-31
CPC Classifications: H04B,H04J

Claim:
1. An optical system comprising: a first trunk terminal emitting an optical signal; a second trunk terminal receiving the optical signal; a communication trunk disposed along a floor of a body of water and coupling the first trunk terminal to the second trunk terminal, the communication trunk transmitting the optical signal from the first trunk terminal to the second trunk terminal; an intermediate unit connected to the communication trunk between the first and second trunk terminals, the intermediate unit receiving the emitted optical signal from the first trunk terminal, amplifying the received optical signal, and sending the amplified optical signal to the second trunk; a power source connected to and powering the intermediate unit, the power source located at or near a surface of the body of water; and a branching unit disposed along the communication trunk and coupling a branch terminal to the communication trunk, the branching unit comprising an optical add-drop multiplexer comprising: