OSNR-Aware Route Selection for All-Optical Wavelength Conversion
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Solution Overview
Problem
All-optical wavelength conversion (AOWC) in optical networks introduces signal penalty due to phase noise transfer and nonlinear effects, leading to a decrease in optical signal-to-noise ratio (OSNR), which affects high-speed optical channel signal transmission and is costly.
Innovation Solution
A route and wavelength assignment method that includes introducing all-optical wavelength converters in network nodes using sparse wavelength converter placement and an OSNR awareness algorithm model, which calculates and selects the route with the highest OSNR to mitigate signal penalty and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all-optical wavelength conversion is introduced to improve network capacity efficiency, then wavelength resource assignment flexibility is improved, but optical signal-to-noise ratio decreases due to phase noise transfer and nonlinear effects
Solution Approach 1:
The patent applies local quality by selectively placing wavelength converters only at specific network nodes where they are most needed, rather than uniformly across all nodes. This sparse placement strategy optimizes the local impact of OSNR penalty while maintaining overall network flexibility. The converter placement is determined based on network topology and traffic patterns to minimize the cumulative effect of phase noise transfer and nonlinear effects on critical signal paths.
Solution Approach 2:
The patent implements partial action by introducing wavelength conversion capability only at selected nodes rather than at all nodes. This partial deployment reduces the total number of converters needed, thereby limiting the cumulative OSNR degradation from phase noise transfer and nonlinear effects, while still providing sufficient wavelength resource assignment flexibility for network operations.
2Productivity
If more all-optical wavelength converters are deployed to improve wavelength assignment flexibility, then network capacity efficiency is improved, but cost increases
Solution Approach 1:
The patent applies local quality by selectively placing wavelength converters only at specific network nodes where they are most needed, rather than uniformly across all nodes. This sparse placement strategy optimizes the local impact of OSNR penalty while maintaining overall network flexibility. The converter placement is determined based on network topology and traffic patterns to minimize the cumulative effect of phase noise transfer and nonlinear effects on critical signal paths.
Solution Approach 2:
The patent implements partial action by introducing wavelength conversion capability only at selected nodes rather than at all nodes. This partial deployment reduces the total number of converters needed, thereby limiting the cumulative OSNR degradation from phase noise transfer and nonlinear effects, while still providing sufficient wavelength resource assignment flexibility for network operations.
3Adaptability or versatility
If wavelength converters are placed at all network nodes to maximize conversion capability, then wavelength resource assignment flexibility is improved, but OSNR penalty impact increases
Solution Approach 1:
The patent applies local quality by selectively placing wavelength converters only at specific network nodes where they are most needed, rather than uniformly across all nodes. This sparse placement strategy optimizes the local impact of OSNR penalty while maintaining overall network flexibility. The converter placement is determined based on network topology and traffic patterns to minimize the cumulative effect of phase noise transfer and nonlinear effects on critical signal paths.
Solution Approach 2:
The patent implements partial action by introducing wavelength conversion capability only at selected nodes rather than at all nodes. This partial deployment reduces the total number of converters needed, thereby limiting the cumulative OSNR degradation from phase noise transfer and nonlinear effects, while still providing sufficient wavelength resource assignment flexibility for network operations.
Data Source
AI summary
The present invention provides a route and wavelength assignment method based on all-optical wavelength conversion, including the steps of: introducing an all-optical wavelength converter in the network; placing a corresponding number of all-optical wavelength converters in a network node according to the principle of sparse wavelength converter placement; establishing an optical channel for the service, in which the establishing an optical channel includes the steps of: establishing an OSNR awareness route and wavelength assignment algorithm model that includes transmission loss, ASE noise and OSNR penalty; and calculating the OSNR of various routes by using the OSNR awareness route and wavelength assignment algorithm model and establishing the optical channel using the route with the highest OSNR and accomplishing wavelength assignment. The present invention can reduce the cost of all-optical wavelength conversion and the impact of the OSNR penalty on the network performance improvement.