Patent ID: 8781330

Claim:
An optical repeater passively relaying a multiplexed optical signal, comprising: a first and a second input/output port each receiving and outputting the multiplexed optical signal; an optical decoder decoding the multiplexed optical signal to a first optical signal; a first optical path switch outputting the multiplexed optical signal to said optical decoder and outputting the first optical signal entering from said optical decoder; a second optical path switch outputting the first optical signal received from said first optical path switch to a termination unit connected to said repeater and outputting a second optical signal delivered from the termination unit; an optical encoder encoding the second optical signal to a third optical signal; a third optical path switch outputting the second optical signal entering from said second optical path switch to said optical encoder and outputting the third optical signal; a fourth optical path switch outputting the multiplexed optical signal received on said first input/output port to said first optical path switch and outputting the third optical signal delivered from said third optical path switch to said first input/output port; and a fifth optical path switch outputting the multiplexed optical signal received on said second input/output port to said optical encoder and outputting the first optical signal delivered from said optical decoder to said second input/output port.