Abstract
Two novel linewidth-tolerant, low-complexity feedforward carrier phase
estimation algorithms are described for dual-polarization 16-ary quadrature-amplitude-modulation
with coherent detection. For both algorithms, the carrier phase is estimated
in two stages. The first stage employs either a simplified quadrature-phase-shift-keying
(QPSK) partitioning algorithm or the blind phase search (BPS) algorithm. The
second stage employs a novel QPSK constellation transformation algorithm.
The performance and linewidth tolerance of both algorithms are evaluated using
experimental and simulation data, and the hardware complexity is assessed.
For both proposed two-stage algorithms, the linewidth symbol duration product
is 1.3 × 10<sup>-4</sup> for a 1 dB penalty in optical signal-to-noise ratio at a bit error
ratio of 10<sup>-3</sup>. This performance is comparable to a single-stage BPS algorithm
with a large number of test phases, but with a reduction of the hardware complexity
by factors of about 2.5–11.
© 2012 IEEE
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