WSS Channel Attenuation Control to Reduce Cascaded Filtering Damage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The performance of receivers deteriorates due to filtering damage caused by cascaded Wavelength-Selective Switches (WSSs) in optical signals, leading to issues like clock jitter and extraction failure in clock detection algorithms, particularly in quasi-Nyquist WDM systems.
Innovation Solution
A method and device for controlling WSS channel attenuation by inputting white noise and adjusting attenuation parameters of WSS modules to achieve a predefined spectrum flatness, followed by calculating an average value to set optimal attenuation parameters for each WSS module, thereby reducing filtering damage and improving receiver performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cascaded WSS modules are used to achieve flexible grid WDM with dynamic channel spacing, then spectral efficiency is improved and system transmission capacity is expanded, but filtering damage occurs to penetrating traffic light causing receiver performance deterioration
Solution Approach 1:
The patent adjusts the channel attenuation parameter of WSS modules dynamically based on the number of cascaded modules. By changing the attenuation parameter from a fixed value to a variable that adapts to the cascade depth, the system compensates for filtering damage while maintaining flexible grid functionality. This parameter adjustment restores the spectral shape to ensure reliable receiver operation.
Solution Approach 2:
The system implements feedback control by monitoring the actual filtering effect of cascaded WSS modules and adjusting the attenuation parameters accordingly. The control method uses the measured spectral characteristics to optimize the attenuation settings, creating a closed-loop system that maintains receiver performance despite varying cascade configurations.
2Device complexity
If WSS channel attenuation parameter is fixed, then device complexity is reduced, but filtering damage accumulates in cascaded WSS systems causing high-frequency component suppression
Solution Approach 1:
The patent transforms the fixed attenuation parameter into a variable parameter that changes based on the cascade configuration. By implementing dynamic parameter adjustment, the system achieves optimal filtering characteristics for each cascade scenario without requiring complex manual configuration, balancing simplicity with performance.
Solution Approach 2:
The system performs preliminary adjustment of the attenuation parameter before signal transmission through cascaded WSS modules. By pre-configuring the appropriate attenuation value based on the known cascade depth, the system prevents filtering damage before it occurs, eliminating the need for complex real-time compensation.
3Productivity
If channel spacing is reduced to improve spectral efficiency, then more channels fit in the C-band, but signal spectral bandwidth approaches WSS channel bandwidth causing severe receptivity deterioration
Solution Approach 1:
The patent adjusts the WSS channel attenuation parameter to compensate for the reduced margin between signal spectral bandwidth and WSS channel bandwidth. By dynamically modifying the attenuation characteristics, the system maintains adequate filtering performance even when channels are closely spaced, preserving receiver receptivity while achieving high spectral efficiency.
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
Embodiments of the present invention provide a method and a device for controlling a wavelength-selective switch (WSS) channel attenuation, a storage medium, and a processor. The method comprises: for each WSS module in a WSS system, inputting white noise to a channel of the WSS module, and adjusting attenuation parameters of all slices of the channel according to a predetermined rule, such that the flatness of an output spectrum of the white noise is less than a first threshold; and averaging adjusted attenuation parameters of slices corresponding to a plurality of WSS modules, and controlling a WSS channel attenuation of each WSS module in the WSS system according to the obtained average value. The embodiments of the present invention resolve the issues in the related art in which an optical signal suffers filtering damage due to multi-level WSS, and the performance of a receiver deteriorates after a filtered optical signal enters the receiver, thereby effectively reducing filtering damage to the optical signal when the optical signal passes through the multi-level WSS, and also improving the performance of the receiver.