Abstract
We propose a novel coded modulation scheme for coherent
optical orthogonal frequency-division multiplexing (CO-OFDM) to achieve high-speed
transmission at spectral-efficiencies near the Shannon limit. The proposed
coding scheme relies on the concept of bit interleaved coded modulation with
iterative decoding (BICM-ID), low-density parity-check (LDPC) codes, and shaped
iterative polar modulation (IPM). To further increase the transmission spectral
efficiency, reduced guard interval (RGI) CO-OFDM is used, in which fiber chromatic
dispersion (CD) is digitally compensated prior to OFDM demultiplexing at the
receiver. We experimentally demonstrate the generation and forward error correction
(FEC) decoding of a 231.5-Gb/s RGI-CO-OFDM signal with 256-IPM subcarrier
modulation, occupying a bandwidth of 20.75 GHz. The coded 256-IPM signal offers
a coding gain of 15.1-dB compared to uncoded 256-point quadrature amplitude
modulation (256-QAM) at a post-FEC bit error ratio of $10^{- 15}$. Transmission was demonstrated
over an 800-km ultra-large-area fiber (ULAF) link with a record intrachannel
spectral efficiency of 11.15-b/s/Hz.
© 2012 IEEE
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