Group Optical Channel Shared Protection Switching
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Solution Overview
Problem
Existing optical channel shared protection methods in optical communication networks require separate switching devices for each wavelength pair, leading to increased cost and complexity, especially when implementing protection for multiple wavelength pairs in a ring network, and face challenges with wavelength utilization efficiency and OSNR budget constraints.
Innovation Solution
The method involves grouping affected optical wavelengths and switching them between working and backup fibers, using optical wavelength selective devices to steer, copy, pass through, and strip backup wavelengths, allowing for consistent protection switching across a group of wavelengths without the need for separate devices for each wavelength, thereby simplifying the protection process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate switching devices are used for each wavelength pair in optical channel shared protection, then the protection reliability is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent merges multiple wavelength-specific switching devices into a single shared protection switching device that can handle multiple wavelength pairs simultaneously. This consolidation reduces device complexity and cost while maintaining protection reliability through unified control of the protection switching mechanism across all wavelength channels.
Solution Approach 2:
The protection switching device is designed with universal functionality to serve multiple wavelength pairs through a single device. The device can dynamically switch between different wavelength channels using wavelength selective switches, making one device perform the protective function that previously required multiple dedicated devices, thereby reducing overall system complexity.
2Manufacturing precision
If separate switching devices are used for each wavelength pair, then the protection switching precision is improved, but the cost increases
Solution Approach 1:
Multiple protection switching functions are merged into a single device with wavelength-selective capabilities. This approach maintains the precision of protection switching for each wavelength pair while reducing the total number of devices required, thereby lowering manufacturing costs and system complexity.
Solution Approach 2:
The system uses wavelength as a selectable parameter to route different wavelength pairs through the same physical switching device. By changing the wavelength parameter handled by the device, a single device can provide precise protection switching for multiple wavelength channels, eliminating the need for multiple dedicated devices and reducing overall cost.
3Reliability
If more protection resources are allocated to multiple wavelength pairs, then the network survivability is improved, but the wavelength utilization efficiency decreases
Solution Approach 1:
The patent merges the protection resources for multiple wavelength pairs into a shared pool that is managed by a single protection switching device. This allows the same protection wavelengths to be dynamically allocated to different working wavelengths as needed, improving wavelength utilization efficiency while maintaining network survivability through shared protection capabilities.
Solution Approach 2:
The protection switching device implements dynamic resource allocation where protection wavelengths can be flexibly assigned to different working channels based on current network conditions and failure scenarios. This dynamic approach allows the system to maintain high network survivability while optimizing wavelength utilization by avoiding static, dedicated protection allocations.
Data Source
AI summary
The present invention discloses a method and system for group optical channel shared protection. In the invention, when a failure occurs, operations are performed on an optical wavelength group, and four actions are accomplished at the time of switching: switching the affected optical wavelength group on the working fiber to a backup fiber (Steer); switching the optical wavelength group whose destination node is the current node on the backup fiber to the working fiber (Copy); making the optical wavelength group whose destination node is not the current node on the backup fiber transparently pass through the current node (Pass Through); and blocking or stripping the backup wavelength group transferred on the backup fiber (Strip). In addition, the invention further discloses a plurality of node structures for realizing the above operations.