Optical Communication Apparatus Wavelength Feedback Control
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Solution Overview
Problem
The narrowing of wavelength bands in WDM systems due to increased channel occupancy and reduced passband characteristics in wavelength selective switches leads to lower transmission characteristics in optical communication systems.
Innovation Solution
An optical communication apparatus and method that includes a monitor unit to analyze the reception waveform of an optical signal and a center wavelength controlling unit to feedback-control the center wavelength of the transmission waveform, ensuring optimal alignment within the wavelength division multiplexed signal light, thereby improving transmission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of channels in a WDM system is increased to improve channel occupancy, then the wavelength band must be narrowed, but this leads to lower transmission characteristics
Solution Approach 1:
The invention applies dynamic wavelength adjustment by continuously monitoring reception waveforms and feedback-controlling the center wavelength of transmitted optical signals. This dynamic adaptation allows the system to maintain optimal transmission characteristics while supporting increased channel occupancy through flexible wavelength management.
Solution Approach 2:
The invention implements a feedback control mechanism where the reception waveform is monitored and used to adjust the center wavelength of the transmitted signal. This closed-loop feedback system enables real-time optimization of transmission characteristics, resolving the contradiction between increased channel occupancy and maintained transmission quality.
2Volume of moving object
If the size of wavelength selective switch is reduced to improve device compactness, then the passband characteristics are narrowed, but this leads to lower transmission characteristics
Solution Approach 1:
The invention changes the parameter of center wavelength dynamically based on monitored reception waveform characteristics. This parameter adjustment compensates for the narrowed passband caused by compact WSS design, allowing the system to maintain optimal transmission characteristics despite reduced device size.
Solution Approach 2:
The feedback control mechanism monitors reception waveform quality and adjusts the center wavelength accordingly, compensating for the limitations imposed by reduced WSS size. This enables compact device design without sacrificing transmission characteristics.
3Productivity
If the wavelength band is narrowed to accommodate more channels, then channel occupancy increases, but transmission characteristics deteriorate
Solution Approach 1:
The system dynamically adjusts the center wavelength within the narrowed wavelength band to optimize transmission characteristics for each channel. This dynamic positioning allows maximum utilization of the available wavelength band while maintaining high transmission quality despite the overall band narrowing.
Solution Approach 2:
The invention applies local optimization by adjusting the center wavelength specifically for each transmitted optical signal based on its reception waveform. This localized quality control ensures that each channel achieves optimal transmission characteristics within the constrained wavelength band.
Data Source
AI summary
Provided are an optical communication apparatus, an optical communication method, and an optical communication system that each can improve transmission characteristics. An optical communication apparatus includes a monitor unit configured to, when the optical communication apparatus connects to an optical communication network and converts an optical signal received from another optical communication apparatus to a digital signal, monitor a reception waveform of the optical signal, the optical communication network including a plurality of optical communication apparatuses connected via a transmission line that transmits WDM signal light in which a plurality of optical signals are wavelength-division multiplexed; and a center wavelength controlling unit configured to, based on the monitored reception waveform, feedback-control a center wavelength of a transmission waveform of an optical signal that the other optical communication apparatus transmits.