Experimental Evaluation of High-Rate LDPC Codes for PMD Compensation by Turbo Equalization

Several LDPC-codes with rate above 0.9 are proposed, and employed in PMD- compensation by LDPC-coded turbo-equalization. The block-circulant LDPC(15328,13893) is only 1.25 dB away from the channel-capacity limit for DGD of 125 ps (and NRZ transmission at 10- Gb/s).