Abstract
We present a highly efficient carrier phase recovery module for coherent optical detection of
single-carrier advanced modulation formats with differential precoding. Remarkably, we eliminate all multipliers from
the multisymbol-delay-detector (MSDD) carrier recovery system, without incurring performance penalty relative to the
previously shown complex-domain MSDD. We also introduce a novel polyblock hardware parallelization method for the
MSDD, eliminating the “distant feedback” parallelization penalty of decision-feedback-based carrier
recovery methods, such as MSDD. Simulations indicate extremely high nonlinear phase noise tolerance for the new polar
MSDD carrier recovery system for 16-QAM 2000 km transmission. The ultralow-complexity CR is simulated and
electrically demonstrated in real-time at 25 Gbaud symbol rate over FPGA HW for single-carrier QPSK and 16-QAM
constellations, respectively.
© 2013 CC
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