Polarization-multiplexed rate-adaptive non-binary-quasi-cyclic-LDPC-coded multilevel modulation with coherent...

Area of Science:

• Optical communication systems
• Information theory
• Coding theory

Background:

• Optical transport networks (OTNs) require high-speed transmission and maximum throughput.
• Existing bit-interleaved LDPC-coded modulation (BI-LDPC-CM) schemes face limitations in latency and efficiency.

Purpose of the Study:

• To propose a novel rate-adaptive polarization-multiplexed coded multilevel modulation scheme.
• To leverage non-binary quasi-cyclic (QC) LDPC codes for enhanced performance in OTNs.

Main Methods:

• Utilizing symbol-level processing instead of bit-level processing.
• Implementing non-binary LDPC codes with polarization-multiplexed multilevel modulation.
• Employing coherent detection for signal recovery.

Main Results:

• The proposed non-binary LDPC-coded modulation (NB-LDPC-CM) scheme reduces latency.
• Achieves either significant reduction in computational complexity or notable improvements in coding gain.
• Outperforms prior-art binary LDPC-coded modulation schemes.

Conclusions:

• The NB-LDPC-CM scheme meets the demands of future OTNs for high throughput and target Bit Error Rate (BER) performance.
• Offers superior efficiency and performance over the operational lifetime of the network.