Abstract
We propose a joint scheme for symbol, sampling clock, and carrier frequency
synchronization in a polarization division multiplexing coherent optical orthogonal
frequency division multiplexing (PDM-CO-OFDM) system. Unlike other existing
algorithms designed for specific impairment, the scheme can estimate and compensate
for the interactional synchronization errors effectively without extra training
overhead by building a comprehensive error model. The simulation shows that symbol
synchronization error and sample timing error can be corrected by channel equalizer,
and the estimation ranges of sampling frequency offset and normalized carrier
frequency offset are about (-2000, 2000)ppm, and (-0.04 (-3.5), 0.04 (3.5))Ghz,
respectively.
© 2014 Chinese Optics Letters
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