Optical Path Protection Switching for Network Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrical and optical networks face disruptions due to faults, such as power failures or physical damage, which can cause service interruptions, highlighting the need for seamless alternative communication paths.
Innovation Solution
A method and apparatus that access optical link information to determine and instantiate a protection optical path in an optical network, ensuring continuous communication by activating alternative links that meet specific optical criteria, thereby providing path protection without service disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical layer solutions are used for fault protection, then path protection can be provided, but network costs and restoration times increase
Solution Approach 1:
The patent replaces electrical layer protection mechanisms with optical layer protection. Instead of using electrical switching and signaling protocols, the system directly operates at the optical layer to detect faults and switch paths, eliminating the need for complex electrical processing and reducing restoration time significantly.
Solution Approach 2:
The system pre-establishes protection paths and pre-configures optical switches before faults occur. By preparing backup paths in advance and maintaining them in a ready state, the system can immediately switch to protection paths when faults happen, minimizing restoration time without requiring real-time path calculation.
2Reliability
If dedicated protection paths are established, then service continuity is improved, but network resource consumption increases
Solution Approach 1:
The patent implements a protection switching mechanism that can serve multiple functions: protecting against various types of faults (fiber cuts, node failures), supporting different service types, and providing both dedicated and shared protection modes. This multi-functionality reduces the need for separate dedicated protection resources for each scenario.
Solution Approach 2:
The system dynamically adjusts protection path selection based on real-time network conditions, fault types, and resource availability. Rather than statically allocating dedicated protection resources, the system can adaptively choose from multiple potential protection paths, optimizing resource utilization while maintaining service continuity.
3Loss of time
If fast protection switching is implemented, then service disruption is reduced, but switching complexity increases
Solution Approach 1:
The patent extracts the protection switching function from the complex electrical control plane and implements it directly at the optical layer. By removing intermediate electrical processing steps and control protocol overhead, the system achieves fast switching while simplifying the overall mechanism to purely optical operations.
Solution Approach 2:
The optical switching system performs self-switching capability where optical switches can automatically detect faults and redirect traffic without requiring external electrical control signals. This self-service mechanism eliminates the need for complex electrical control infrastructure and enables fast, simple protection switching.
Data Source
AI summary
Optical networks occasionally experience a fault along a communications path. Service providers prefer to have an alternative communications path available to enable users to still communicate in a seamless manner. Accordingly, a method and corresponding apparatus for providing path protection for dedicated paths in an optical network is provided.