Patent ID: 9686013
Date: 2017-06-20
CPC Classifications: H04B,H04J,H04L

Claim:
1. A system, for communication over a fiber link with a predefined length, comprising: a transmitter to transmit an information signal, wherein the information signal comprises an information spectrum, and wherein the transmitter is further to transmit two spectrally inverted copies of the information spectrum over the predefined length of the fiber link, the two spectrally inverted copies corresponding to a first spectrum with a first center wavelength and to a second spectrum with a second center wavelength, the second spectrum being inverted relative to the first spectrum and the second center wavelength being different from the first center wavelength; and a receiver to receive the first spectrum and the second spectrum, the receiver comprising a signal processing unit to estimate a phase rotation of the second spectrum relative to the first spectrum by comparing a first phase measured from the first spectrum received with a second phase measured from the second spectrum received.