CPC H04J 14/06 (2013.01) [H04B 10/077 (2013.01); H04B 10/63 (2013.01)] | 16 Claims |
1. A system for polarization-multiplexed self-homodyne analog coherent (PM-SH-ACD) architecture for optical communication links, the system comprising:
a receiver section having:
a polarization splitter rotator (PSR) for:
receiving a polarized signal from a fiber optic cable;
polarization un-rotating by 90 degrees the polarized signal into a first polarized optical signal and a second polarized optical signal, each having some of a second output of a laser light and some of an optical modulated data signal;
a polarization recover (PR) component for recovering a polarization of the first and second polarized optical signals based on a received polarization recovery signal to recover a polarization fixed first optical signal having the optical modulated data signal and to recover a polarization fixed second optical signal having the second output of the laser light, wherein the first and second polarization fixed first optical signal have a same polarization;
a carrier recovery (CR) component for: (a) recovering a frequency and a phase of the second output of the laser light from the polarization fixed second optical signal; (b) demodulating the polarization fixed first optical signal into a polarization and frequency fixed first optical signal having a QPSK data signal and a pilot tone signal; and (c) demodulating the polarization fixed second optical signal into a polar, frequency and phase fixed second optical signal that is the second output of the laser light;
a 90 degree optical hybrid component for splitting the polarization and frequency fixed first optical signal and the polar, frequency and phase fixed second optical signal into 4 optical QPSK quadrature component signals (I+, I−, Q+, Q−);
4 photodiodes (PDs) for converting the 4 optical quadrature component signals into 4 electrical current quadrature signals;
two TIAs for converting the 4 electrical current quadrature signals to 4 electrical voltage QPSK quadrature data signals; and
a polarization detector for detecting a polarization of the pilot tone signal to identify a polarization of a modulated signal and outputting the pilot signal measurement signal based on a detected polarization.
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