Method and device for phase recovery and communication system comprising such device
View Patent ↗A method and a device are provided for phase recovery of at least two channels comprising the steps of (i) a phase is estimated for each channel; (ii) the phase estimated of each channel is superimposed by a coupling factor with at least one other phase estimated. Further, a communication system is suggested comprising such a device.
1. A method for phase recovery of an optical signal, comprising the steps of:
separating, with a coherent receiver device, the optical signal into an X component and a Y component having an orthogonal polarization to the X component;
estimating a phase independently for the X component and the Y component; and
superimposing the phase estimated for each of the X component and Y component multiplied by a coupling factor with the phase estimated for the other of the Y component and the X component.
2. The method according to claim 1 , which comprises modulating each of the X component and Y component according to a PSK modulation or a QAM modulation.
3. The method according to claim 2 , which comprises modulating with a PSK modulation scheme selected from the group consisting of QPSK, BPSK, and 8PSK.
4. The method according to claim 2 , which comprises modulating with high order QAM.
5. The method according to claim 1 , wherein the coupling factor differs for at least two phases.
6. The method according to claim 1 , which comprises using one coupling factor for at least two phases.
7. The method according to claim 1 , implemented for determining a frequency offset of a local oscillator at the receiver.
8. The method according to claim 1 , wherein the coupling factor comprises at least one fixed value.
9. The method according to claim 1 , which comprises adaptively adjusting the coupling factor.
10. The method according to claim 1 , wherein the coupling factor is determined based on at least one of a length of a fiber or an input power.
11. A device for phase recovery of an optical signal, the device one of comprising and associated with:
at least one of a processor unit, a hard-wired circuit, or a logic device configured to:
separate the optical signal into an X component and a Y component having an orthogonal polarization to the X component;
estimate a phase independently for the X component and the Y component; and
superimpose the phase estimated for each of the X component and Y component multiplied by a coupling factor with the phase estimated for the other of the Y component and the X component.
12. The device according to claim 11 , wherein the device is a communication device.
13. The device according to claim 12 , wherein the device is an optical network component.
14. A communication system, comprising the device according to claim 11 .