Iterative Polar Quantization-Based Modulation to Achieve Channel Capacity in Ultrahigh-Speed Optical Communication Systems

• Main Authors: Hussam G. Batshon, Ivan B. Djordjevic, Lei Xu, Ting Wang
• Format: Article
• Language: English
• Published: IEEE 2010-01-01
• Series: IEEE Photonics Journal
• Subjects: Coded modulation; coherent communications; fiber optics and optical communications; forward error correction; iterative polar quantization (IPQ); low-density parity-check (LDPC) codes
• Online Access: https://ieeexplore.ieee.org/document/5482065/
• ISSN: 1943-0655

In this paper, we propose a nonuniform coded-modulation format based on iterative polar quantization (IPQ) as a scheme to enable achieving channel capacity in ultrahigh-speed optical communication systems. The proposed modulation format is coded with structured low-density parity-check (LDPC) codes optimized for Gaussian channels and, in combination with polarization-multiplexing, can achieve 800 Gb/s per wavelength aggregate rate and beyond utilizing the currently available components operating at 50 GS/s. Using coded IPQ, we show that we can achieve capacity for signal-to-noise ratios (SNRs) of up to 25 dB and increase the total propagation distance over optical transmission systems by 275 km over coded star-quadrature amplitude modulation (QAM).