Patent ID: 9264134
Filing Date: 2016-02-16
CPC Classification: H04B

Claim Text:
1. A communication system, comprising: a first optical source configured to supply a first optical signal to a first optical link, the first optical signal propagating in a first direction along the first optical link; a second optical source configured to supply a second optical signal to a second optical link, the second optical signal propagating in the first direction along the second optical link; a first control circuit configured to: a third optical source configured to supply a third optical signal to the second optical link in response to the first signal, the third optical signal propagating in a second direction different than the first direction; a second control circuit configured to: a fourth optical source configured to supply a plurality of fourth optical signals to the second optical link, the plurality of fourth optical signals propagating along the second optical link in the second direction; an optical supervisory channel transmitter configured to supply an optical supervisory channel to the second optical link, the optical supervisory channel propagating in the second direction and carrying information indicative of the break in the first optical link; and a transmitter amplifier coupled to the first optical link, where the second optical source is disabled in response to the second optical signal, and the second optical signal provides Raman gain to the fourth optical signal, and the transmitter amplifier is disabled in response to the optical supervisory channel.