State integrated Look-up table assisted BCJR scheme with significant complexity optimization in bandwidth-limited...

Area of Science:

• Optical communication systems
• Digital signal processing
• Information theory

Background:

• Inter-symbol interference (ISI) is a major impairment in high-speed optical interconnections.
• Bandwidth-efficient intensity modulation/direct detection (IM/DD) systems require efficient detection schemes.
• Traditional look-up table (LUT) based Bahl-Cocke-Jelinek-Raviv (BCJR) algorithms face high computational complexity.

Purpose of the Study:

• To propose and experimentally demonstrate a novel state-integrated look-up table (SiLUT-BCJR) detection scheme.
• To reduce the computational complexity of BCJR algorithms in IM/DD optical systems.
• To improve the efficiency of detection in high-speed optical interconnections.

Main Methods:

• Implementation of a state-integrated look-up table (SiLUT-BCJR) detection scheme.
• Utilizing a merging approach for intermediate symbols to integrate LUT patterns.
• Simplifying counting paths for symbols affected by inter-symbol interference (ISI).

Main Results:

• The proposed SiLUT-BCJR scheme reduces computational complexity by 75% compared to traditional LUT-BCJR.
• Experimental validation in a 160 Gbit/s PAM4 system over single-mode fiber (SMF).
• Negligible optical power penalty observed, demonstrating system robustness.

Conclusions:

• The SiLUT-BCJR scheme offers significant computational advantages for optical interconnections.
• The proposed method effectively mitigates ISI while maintaining high data rates.
• This approach enhances the efficiency and practicality of high-performance optical communication systems.