Signal Receiver Phase Jump Correction for FEC Burst Errors
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Solution Overview
Problem
Coherent receiving systems in high-speed optical fiber transmission systems often experience phase jumps, leading to continuous burst bit errors that invalidate forward error correction decoding and result in numerous bit errors.
Innovation Solution
A method and apparatus that detect phase jumps in data segments by performing phase shifts and calculating check relationship mismatches, followed by phase correction and confidence correction to minimize bit errors, using techniques such as linear, nonlinear, or table lookup corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If coherent receiving technology is used in high-speed optical fiber transmission systems, then transmission rate is improved, but phase jumps occur causing continuous burst bit errors
Solution Approach 1:
The patent applies preliminary action by performing phase jump detection and correction before forward error correction decoding. The method detects phase jumps in data segments using check relationships from FEC coding, performs phase correction to eliminate the jumps, and then proceeds with confidence correction and FEC decoding. This preliminary correction prevents phase jumps from causing continuous burst bit errors during decoding, thereby maintaining high transmission rates while improving reliability.
2Reliability
If phase correction is performed on data segments, then bit errors are reduced, but additional processing steps are required
Solution Approach 1:
The patent applies self-service by utilizing the check relationships that are already inherent in the forward error correction coding structure. The phase jump detection mechanism uses the existing check relationships from FEC coding without requiring external reference signals or additional overhead. The system serves itself by detecting phase jumps through its own coding structure and correcting them autonomously before decoding, reducing bit errors without adding significant external complexity.
3Measurement precision
If confidence correction is performed after phase correction, then decoding accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies continuity of useful action by seamlessly integrating confidence correction into the processing pipeline immediately after phase correction. The confidence correction uses the phase-corrected data segments and applies confidence values based on the detected phase jump conditions. This continuous processing without interruption or re-synchronization maintains decoding accuracy while minimizing additional processing time, as the confidence correction is performed in direct succession to phase correction using the already-prepared corrected data.
Data Source
AI summary
The present application discloses a method for processing a signal. An apparatus detects, according to a check relationship set during a forward error correction coding, that a phase jump occurs in a data segment of a signal, and a quantity of degrees of the phase jump, performs, according to the quantity of degrees of the phase jump, a phase correction on the data segment; after the phase correction, performs a confidence correction on the data segment; and after the confidence correction, performs a forward error correction decision decoding on the data segment on which the confidence correction has been performed and output the data segment.