Phase Deviation Compensation in Coherent Optical Transmission
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Solution Overview
Problem
In coherent detection high-speed optical transmission systems, existing phase ambiguity training schemes require excessive bandwidth due to the inability to accurately identify phase ambiguity in the middle of data sequences, leading to inefficient phase correction.
Innovation Solution
A method that divides a data sequence into subdata sequences and determines phase compensation based on phase differences between training sequences, allowing for targeted phase correction using threshold values to reduce the need for extensive training sequences, thereby improving phase correction accuracy and reducing bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional phase ambiguity training schemes are used, then phase correction can be performed, but excessive bandwidth is required due to the need for frequent training sequences
Solution Approach 1:
The data sequence is divided into multiple subdata sequences, and phase compensation is performed selectively on specific subdata sequences based on phase difference detection, rather than uniformly compensating all sequences. This segmentation approach reduces the number of training sequences needed while maintaining correction accuracy.
Solution Approach 2:
Instead of performing phase compensation on all data sequences, the invention applies compensation only to subdata sequences where phase ambiguity is detected (partial action). This selective approach reduces bandwidth consumption by eliminating unnecessary training sequences while maintaining adequate correction coverage.
2Reliability
If training sequences are frequently introduced to ensure phase correction accuracy, then phase correction reliability improves, but bandwidth efficiency deteriorates
Solution Approach 1:
The system detects phase differences between adjacent training sequences and uses this feedback information to determine which subdata sequences require phase compensation. This feedback mechanism enables selective compensation only where needed, improving bandwidth efficiency while maintaining correction reliability.
Solution Approach 2:
The invention changes the parameter of training sequence frequency by making it adaptive rather than fixed. Training sequences are introduced only when phase deviation is detected, transforming the parameter from a constant high frequency to a variable frequency that matches actual correction needs, thereby improving bandwidth efficiency.
3Productivity
If data sequences are made longer to reduce training sequence overhead, then bandwidth efficiency improves, but phase correction capability deteriorates due to inability to correct mid-sequence phase ambiguity
Solution Approach 1:
The system performs preliminary detection of phase differences between training sequences before processing data sequences. This preliminary action identifies which subdata sequences will require compensation, enabling the system to handle longer data sequences while maintaining correction capability through targeted mid-sequence compensation.
Solution Approach 2:
The invention introduces dynamic adaptability to the phase correction system by using threshold-based detection and selective compensation. The system dynamically determines which subdata sequences need correction based on real-time phase difference measurements, enabling it to effectively handle variable-length data sequences while maintaining correction reliability.
Data Source
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AI summary
The present invention provides a method and device for compensating a phase deviation, which are applied to a data sequence between a first training sequence and a second training sequence which are received by a receiving end; The method includes: determining a first phase difference between a first training sequence and a standard training sequence used for reference, and a second phase difference between a second training sequence and the standard training sequence; determining a subdata sequence requiring a phase compensation in multiple subdata sequences forming the data sequence according to the first phase difference and the second phase difference; calculating a phase compensation value corresponding to the subdata sequence requiring the phase compensation by using the first phase difference and the second phase difference; and conducting the phase compensation on the subdata sequence requiring the phase compensation by using the phase compensation value corresponding to the subdata sequence. The solution of the present invention can improve capability of a receiving end to correct a phase deviation in a data sequence.