Wavelength Selection Switch Feedback for Optical Signal Power Recovery
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Solution Overview
Problem
Existing optical communication systems lack a means to restore optical signal intensity to suitable levels when fluctuations occur due to transmitter aging, failures, or land transmission path issues, affecting other signals through gain characteristics of submarine transmission path amplifiers, especially in spectrum sharing scenarios.
Innovation Solution
An optical transmission device and method that utilize a wavelength selection switch and optical detection means to adjust attenuation amounts based on threshold values, ensuring optical signal intensity remains between first and second threshold values, thereby restoring intensity to suitable levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If optical signal intensity is adjusted uniformly without real-time monitoring, then device complexity is reduced, but signal intensity stability deteriorates when transmitter aging or failures occur
Solution Approach 1:
The patent implements a feedback control mechanism where optical detection means continuously monitors the intensity of optical signals, and the wavelength selection switch means adjusts attenuation amounts based on detected intensity values to maintain signals within threshold ranges, thereby resolving the contradiction between simple device design and reliable signal stability
Solution Approach 2:
The system performs self-adjustment by automatically detecting optical signal intensity and controlling attenuation without external intervention, allowing the optical transmission device to maintain signal quality autonomously despite transmitter aging or failures
2Illumination intensity
If attenuation amount is increased to compensate for high signal intensity, then signal intensity is reduced to acceptable levels, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent employs dynamic attenuation control where the wavelength selection switch means continuously adjusts attenuation amounts based on real-time intensity detection, optimizing the balance between reducing excessive intensity and maintaining signal quality by applying minimal necessary attenuation
Data Source
AI summary
To provide an optical transport device that enable the strengths of optical signals to be recovered when the strengths of the optical signals vary, an optical transmission device comprises: a wavelength selection switch that attenuates, in accordance with an attenuation amount, each of a plurality of optical signals outputted from a plurality of optical transmitter, multiplexes and outputs the attenuated optical signals; and an optical detector that detects and compares the strength of at least one of the plurality of optical signals with a first threshold value and a second threshold value higher than the first threshold value. On the basis of the result of said comparison, the wavelength selection switch controls the attenuation amount such that the optical signal the strength of which has been detected has a strength value between the first threshold value and the second threshold value.