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Time-Domain Maximum-Likelihood Channel Estimation for PDM CO-OFDM Systems

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3 Author(s)
Xi Fang ; State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Peking Univ., Beijing, China ; Chuanchuan Yang ; Fan Zhang

We propose an efficient channel estimation method based on time-domain maximum likelihood (TDML) algorithm for polarization-division-multiplexed coherent optical orthogonal frequency-division-multiplexing (CO-OFDM) systems. Compared with the conventional channel estimation approach, although with overhead reduction, TDML demonstrates similar system robustness against transmission impairments, such as optical noise, chromatic dispersion, and polarization-mode dispersion. More importantly, TDML demonstrates enhanced tolerance against laser phase noise. The theoretical analysis is validated by numerical simulation of quadrature-phase-shift-keying CO-OFDM system.

Published in:

Photonics Technology Letters, IEEE  (Volume:25 ,  Issue: 6 )