Adaptive Averager Length Detection for Coherent Optical Receivers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current adaptive filters in coherent optical communication systems cannot effectively track high-rate polarization state changes, leading to polarization crosstalk between signals under different polarization states due to residual polarized dispersion, which affects system performance.
Innovation Solution
A method and apparatus for detecting the average length of an averager in a polarization crosstalk canceling apparatus, determining the magnitude of residual polarization crosstalk coefficients, and adjusting the averager length based on these coefficients to optimize system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a predetermined average length is used in the polarization crosstalk canceling apparatus, then the device complexity is reduced, but the system performance cannot be maintained at the optimum state under varying channel conditions
Solution Approach 1:
The patent applies the dynamics principle by enabling the average length of the averager to be dynamically adjusted based on the magnitude of polarization crosstalk coefficients. The system transitions from a fixed predetermined average length to a variable average length that adapts to changing channel conditions, allowing the receiver to maintain optimal performance under varying polarization state changes while managing device complexity through algorithmic control rather than hardware complexity
2Manufacturing precision
If the adaptive filter tracks polarization state changes at KHz magnitude, then the manufacturing precision is sufficient, but the filter cannot track high-rate polarization state changes at GHz magnitude due to residual polarized dispersion
Solution Approach 1:
The patent applies parameter changes by modifying the average length parameter of the averager based on the magnitude of polarization crosstalk coefficients. When high-rate polarization state changes occur at GHz magnitude, the system adjusts the average length parameter to optimize the balance between tracking speed and filtering effectiveness, enabling the receiver to track rapid polarization changes while maintaining manufacturing precision through controlled parameter adjustment rather than hardware redesign
3Reliability
If the average length of the averager is increased to reduce polarization crosstalk, then the separation of polarization states is improved, but the system response time increases
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the average length of the averager based on real-time polarization crosstalk conditions. The system increases the average length when polarization crosstalk is significant to improve separation quality, and decreases it when crosstalk is minimal to reduce response time. This dynamic adaptation allows the system to optimize the trade-off between polarization separation quality and response time according to actual channel conditions rather than using a fixed compromise value
Data Source
AI summary
The present invention relates to an average length magnitude detecting apparatus and method, and an optical coherent receiver. The average length magnitude detecting method is adopted for detecting whether an average length of an averager used by a polarization crosstalk canceling apparatus in a receiver is long or short, comprising: determining a magnitude of a residual polarization crosstalk coefficient of the receiver; and determining an index that indicates whether the average length of the averager is long or short according to the determined magnitude of the residual polarization crosstalk coefficient.