Degree-to-Degree Fiber Link Protection in OADM Nodes
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Solution Overview
Problem
Conventional optical network protection strategies face issues such as long restoration times, potential unavailability of working paths due to degree-to-degree fiber breaks, and the need for expensive hardware upgrades, as well as limitations in differentiating fiber breaks and maintaining link budget margins.
Innovation Solution
Implementing a local degree-to-degree protection scheme within Optical Add/Drop Multiplexer (OADM) or Reconfigurable Optical Add/Drop Multiplexer (ROADM) nodes, using a local controller to configure redundant fiber links for immediate switching in case of fiber breaks, without relying on end-to-end communication or control planes, allowing for spectrum-selective protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional end-to-end protection strategies are used, then path protection is provided, but restoration time is long and link budget margins are lost
Solution Approach 1:
The patent segments the protection mechanism from end-to-end network level to local node level. Each OADM node independently monitors its own degree-to-degree fiber links and switches to protection fibers locally without waiting for end-to-end fault detection and routing protocol convergence, thereby dramatically reducing restoration time while maintaining link budget margins through local switching.
Solution Approach 2:
The patent pre-configures protection fibers and establishes protection paths in advance at each OADM node. When a fiber break occurs, the locally stored protection configuration is immediately activated without requiring real-time routing computation or end-to-end coordination, enabling fast restoration while preserving link budget benefits.
2Reliability
If conventional protection strategies are used, then fault detection is provided, but expensive hardware upgrades are required
Solution Approach 1:
The patent enables OADM nodes to autonomously detect fiber breaks on their own degree-to-degree links using local monitoring mechanisms and independently switch to protection fibers without requiring external protection hardware or complex hardware upgrades. The existing OADM node resources are utilized for self-protection, eliminating the need for expensive dedicated protection equipment.
3Measurement precision
If degree-to-degree fiber breaks occur, then channel faults are detected, but working paths become unavailable
Solution Approach 1:
The patent implements localized protection at each OADM node for specific degree-to-degree fiber links. Each node independently monitors and protects its own fiber links with dedicated protection fibers, providing precise fault detection and immediate local switching capability that maintains working path availability even when degree-to-degree fiber breaks occur, without affecting other parts of the network.
Data Source
AI summary
Systems and methods are provided for enabling degree-to-degree protection within an optical node, such as an Optical Add/Drop Multiplexer (OADM) node or Reconfigurable Optical Add/Drop Multiplexer (ROADM) node. According to an exemplary protection method, a step is executed for configuring two degree-to-degree fiber links between a first degree of the OADM node and a second degree of the OADM node. The method also includes designating a first degree-to-degree fiber link of the two degree-to-degree fiber links as a primary fiber link. Also, the method includes designating a second degree-to-degree fiber link of the two degree-to-degree fiber links as a protection fiber link configured for providing protection if a fiber break is detected on the primary fiber link.