Wavelength Selective Switch Control for Optical Level Fluctuation
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Solution Overview
Problem
In multi-way WDM systems adapted to flexible grids, optical level fluctuations lead to deteriorated signal transmission quality, necessitating a reduction in the time required to adjust optical levels back to specified values to improve overall system performance.
Innovation Solution
An optical relay device equipped with a wavelength selective switch and a control device that detects optical level fluctuations and adjusts optical levels by enabling or disabling adjustments based on set criteria, reducing the time needed to stabilize optical levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dynamic gain control is used to adjust optical levels, then signal transmission quality is maintained, but the time required to return optical levels to specified values after fluctuation is excessive
Solution Approach 1:
The patent implements dynamic adjustment of the control cycle period based on system state. When optical level fluctuation is detected, the control cycle period is shortened to enable faster response and adjustment. When the system is stable, the control cycle period is extended to reduce control overhead. This dynamic adaptation resolves the contradiction by making the adjustment speed variable rather than fixed.
Solution Approach 2:
The patent changes the control parameter (control cycle period) based on the detected optical level state. By dynamically adjusting the control cycle period parameter, the system can switch between fast response mode (short period) during fluctuations and energy-efficient mode (long period) during stability, thereby resolving the time-quality contradiction.
2Reliability
If frequent optical level adjustments are performed, then signal transmission quality is improved, but control overhead and system complexity increase
Solution Approach 1:
The control cycle period is dynamically adjusted based on whether optical level fluctuation is detected. During normal operation, a longer control cycle period reduces control overhead. When fluctuation is detected, the period is shortened to improve signal quality. This dynamic approach resolves the contradiction between frequent adjustment and control overhead.
Solution Approach 2:
The system continuously monitors optical levels and uses this feedback to determine when to adjust the control cycle period. The feedback mechanism enables the system to perform adjustments only when necessary (when fluctuation is detected), rather than continuously, thereby reducing control overhead while maintaining signal quality when needed.
Data Source
AI summary
An optical relay device includes a WSS functioning as a wavelength selective switch capable of performing path switching in wavelength units and optical level adjustment for each of wavelengths and a control device that instructs, on the basis of a fluctuation amount of an optical level for each of the wavelengths of an optical signal output from the WSS and setting information indicating, for each of the wavelengths, whether optical level adjustment for the wavelengths of the optical signal is enabled, the WSS to perform a setting change of an optical level adjustment amount of the optical signal.