We propose a maximum a posteriori probability (MAP) turbo equalizer based on the sliding-window multilevel Bahl–Cocke–Jelinek–Raviv algorithm. This scheme is suitable for simultaneous nonlinear and linear impairment mitigation in multilevel coded-modulation schemes with coherent detection. The proposed scheme employs large-girth quasi-cyclic LDPC codes as channel codes. We demonstrate the efficiency of this method in dealing with fiber nonlinearities by performing Monte Carlo simulations. In addition, we provide the experimental results that demonstrate the efficiency of this method in dealing with polarization mode dispersion. We also study the ultimate channel capacity limits, assuming an independent identically distributed source.
© 2009 Optical Society of America
Original Manuscript: June 26, 2009
Revised Manuscript: September 25, 2009
Manuscript Accepted: September 30, 2009
Published: October 28, 2009
Ivan B. Djordjevic, Lyubomir L. Minkov, Lei Xu, and Ting Wang, "Suppression of Fiber Nonlinearities and PMD in Coded-Modulation Schemes With Coherent Detection by Using Turbo Equalization," J. Opt. Commun. Netw. 1, 555-564 (2009)