Abstract
A hardware-efficient adaptive algorithm for frequency offset and phase noise mitigation in coherent optical quadrature amplitude modulation systems is presented and analysed. Hardware efficiency for the mitigation of imperfections is achieved by computing directly the complex exponential, thus avoiding a CORDIC processor in the phase recovery loop. The design includes a square-root- and trigonometry-free update. Simulation results substantiate the theoretical findings.
Highlights
A hardware-efficient adaptive algorithm for frequency offset and phase noise mitigation in coherent optical quadrature amplitude modulation systems is presented and analysed
This Letter focuses on mitigation of laser phase noise (PN) and frequency offset (FO)
In this Letter, we suggest minimising the cost function J4(zk) with respect to rk := exp to obtain a complex-valued update as follows: rk+1 = rk − m(z3k,R − i z3k,I)yk where zk = rk∗yk
Summary
A hardware-efficient adaptive algorithm for frequency offset and phase noise mitigation in coherent optical quadrature amplitude modulation systems is presented and analysed. In this Letter, we suggest minimising the cost function J4(zk) with respect to rk := exp (iuk ) to obtain a complex-valued update as follows: rk+1 = rk − m(z3k,R − i z3k,I)yk where zk = rk∗yk .
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