Chinese Optics Letters, Vol. 12, Issue 10, 100605 (2014)
Joint scheme for symbol, sampling clock, and carrier frequency synchronization in PDM-CO-OFDM system beyond 100 Gb/s
Zheng Yan, Yaochao Liu, and Xue Chen
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
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 compre-hensive 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.