Distortion-Aware Route Selection in Wavelength-Converter Networks
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Solution Overview
Problem
Existing communication systems face challenges in efficiently compensating for signal quality deterioration due to increased costs and difficulty in setting unique pre-equalization when transmission paths change, particularly in all-photonics networks with wavelength converters.
Innovation Solution
A route selection apparatus and method that calculates distortion in each signal path and selects the path with minimal distortion to minimize the need for compensation, using a processor to execute instructions for path selection and potential compensation processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal compensation is performed using a wavelength converter with digital or analog circuit, then signal quality deterioration is suppressed, but system cost increases
Solution Approach 1:
The patent extracts the compensation function from the wavelength converter by selecting a transmission path that inherently minimizes distortion, eliminating the need for separate compensation circuits at each node
Solution Approach 2:
The system performs preliminary distortion calculation for multiple candidate paths before transmission, selecting the optimal path in advance to prevent distortion rather than compensating for it later
2Reliability
If pre-equalization is performed by transmission apparatus, then signal quality is improved, but it becomes difficult to set unique pre-equalization when transmission path changes
Solution Approach 1:
The system calculates distortion characteristics for all candidate paths in advance and stores this information, enabling rapid selection of the optimal path when transmission requirements change without requiring complex real-time adaptation
Solution Approach 2:
The system dynamically selects the transmission path based on calculated distortion characteristics, allowing flexible adaptation to different transmission requirements while maintaining optimal signal quality for each specific path
3Reliability
If compensation circuit is required for each wavelength converter, then signal distortion is compensated, but the cost of communication system increases
Solution Approach 1:
The patent removes the compensation circuit from each wavelength converter node and replaces it with a centralized path selection mechanism that achieves distortion minimization through intelligent routing rather than active compensation
Solution Approach 2:
The distortion calculation and path selection apparatus serves multiple functions: it evaluates all candidate paths, determines the optimal transmission route, and enables distortion-free transmission without requiring individual compensation circuits at each node
Data Source
AI summary
A route selection apparatus according to an aspect includes one or more memories that store an instruction and one or more processors that execute the instruction. The one or more processors execute the instruction to calculate, for each of a plurality of signal paths connected to a transmission apparatus, distortion generated in a transmission signal output from the transmission apparatus by using information regarding distortion in the signal path, and select one signal path from the plurality of signal paths based on the calculated distortion.