Patent ID: 9419725
Filing Date: 2016-08-16
CPC Classification: H04B,H04J

Claim Text:
1. A method, in a receiver, for compensation of nonlinear cross phase polarization and cross phase modulation in a dual polarization coherent optical system, the method comprising: receiving a dual polarization optical signal with two pilot tones, each of the two pilot tones is i) at a different frequency thereby avoiding mixing during propagation from the transmitter and ii) in a same State of Polarization (SOP) as respective data signals associated with the dual polarization optical signal; obtaining a Horizontal polarization (H-pol) pilot and a Vertical (V-pol) polarization pilot from the received dual polarization optical signal; and determining scalar products using the H-pol pilot, the V-pol pilot, and a signal pilot, wherein the scalar products are indicative of fast nonlinear cross polarization modulation-induced polarization variations and nonlinear cross phase modulation-induced phase variations during the propagation, for use in the compensation.