Parallel Error Correction Coding for Low-Latency Optical Links
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Solution Overview
Problem
High-speed optical transmission systems face challenges in increasing transmission capacity and distance while maintaining low latency and reducing circuit scale, particularly in metro-core optical transmission systems, due to limitations in error correction coding schemes and inefficient parallel processing of multilevel modulation symbols.
Innovation Solution
An error correction coding apparatus that processes m bits×n symbols in parallel, generating parity bits and replacing known bits with parity bits, allowing for efficient error correction coding and decoding with reduced circuit complexity and low latency, while maintaining the bit configuration of multilevel modulation symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If error correction coding is performed using traditional sequential processing methods, then coding accuracy is maintained, but processing speed is limited and latency increases
Solution Approach 1:
The patent divides the error correction coding process into multiple parallel processing paths, where different bits of the multilevel modulation symbol are processed simultaneously through separate coding circuits. This segmentation enables high-speed parallel processing while maintaining coding accuracy, directly resolving the contradiction between processing speed and latency.
2Productivity
If parallel processing is implemented for multilevel modulation symbols, then processing speed increases, but circuit scale and complexity increase
Solution Approach 1:
The patent designs a universal error correction coding circuit that can process multiple bits of multilevel modulation symbols through the same coding logic. By making the coding circuit multi-functional and reusable across different bit positions, the system achieves high processing capacity without proportionally increasing circuit scale, thus resolving the contradiction between productivity and device complexity.
3Reliability
If more parity bits are added to increase error correction capability, then transmission reliability improves, but transmission capacity for information bits decreases
Solution Approach 1:
The patent applies different error correction coding schemes to different bits of the multilevel modulation symbol based on their individual error characteristics. Bits with higher error susceptibility receive stronger error correction protection, while bits with lower error rates use lighter protection. This localized quality approach optimizes the balance between reliability and transmission capacity by allocating error correction resources efficiently rather than uniformly.
Data Source
AI summary
An error correction coding apparatus that performs error correction coding using, as an error correction code sequence, a frame of m bits×n symbols input in m-bit parallel, where m and n are positive integers, includes: an error correction coding circuit that performs error correction coding using, as information bits, m bits×n symbols including known bits assigned to a bit sequence specified in the error correction code sequence and generate error correction coded parity bits; and a selector that replaces the known bits of the error correction code sequence with the parity bits.