Abstract
We propose a chromatic dispersion (CD) estimation technique by using
the auto-correlation of signal power waveform for DSP based coherent systems.
For single-carrier polarization-division-multiplexed (PDM) systems assuming
Gaussian pulse shapes, we analytically show that the auto-correlation of signal
power waveform contains a peak whose location is indicative of the accumulated
CD and is insensitive to amplified spontaneous emission (ASE) noise, laser
frequency offset, laser phase noise and first-order polarization-mode dispersion
(PMD) and applicable to single-carrier phase-shift keyed (PSK) and quadrature-amplitude
modulation (QAM) systems. As a linear scan of a preset range of CD is not
needed, the number of symbols of the proposed technique is dramatically reduced.
Simulation results show that to estimate the link CD for 112 Gb/s PDM-QPSK
and 224 Gb/s PDM-16-QAM systems, 8192 symbols are sufficient for NRZ/RZ pulse
shapes and 32768 symbols are sufficient for root-raised-cosine pulse shapes
with the roll-off factor as low as 0.1 with estimation error below 175 ps/nm
and 400 ps/nm, respectively.
© 2012 IEEE
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