Patent ID: 8625997
Filing Date: 2014-01-07
Classification: H04B,H04J

Abstract:
1. An apparatus, comprising: a first optical transmitter transmitting a first optical signal; an optical switch having an input that receives the first optical signal, and first and second outputs, the optical switch selectively supplying the first optical signal to one of the first and second outputs, the first output being coupled to a first optical communication path; an optical combiner having first and second inputs and an output, the first input of the optical combiner being coupled to the second output of the optical switch and the second input of the optical combiner being coupled to a second optical communication path, an optical receiver configured to receive the optical signal from the output of the optical combiner when optical signal is supplied from the second output of the optical switch to the first input of the optical combiner; and a second optical transmitter supplying a second optical signal to the second optical communication path, the second optical signal being supplied to the second input of the optical combiner via the second optical communication path, such that the output of the optical combiner supplies the second optical signal to the optical receiver when the optical switch does not supply the first optical signal to the first input of the optical combiner, wherein the optical receiver includes a digital signal processor configured to supply an output signal indicative of a phase and amplitude of the first optical signal, the apparatus further including: a processor circuit configured to supply a control signal in response to the output signal from the digital signal processor, the first optical transmitter receiving the control signal, such that the phase and the amplitude of the first optical signal is adjusted in response to the control signal.