Optical Protection Switching Synchronization via Messaging Channel
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Solution Overview
Problem
Conventional optical protection switching schemes in optical networks lack synchronization between fiber paths, leading to performance deltas and unnecessary traffic disruptions during fiber faults, and require expensive and unreliable shutter mechanisms for synchronization.
Innovation Solution
A method for synchronizing optical protection switching using a splitter on the transmit side and a receive switch with a monitoring port, generating a Forward Defect Indication (FDI) and Optical Protection Switch Indicator (OPSI) status to switch between fiber paths, loading path-specific parameters like PMD, DGD, and modulation formats, and adjusting amplifier gain to maintain synchronized optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional OPS protection scheme is used, then fast traffic restoration is achieved, but synchronization between fiber paths cannot be ensured leading to performance deltas
Solution Approach 1:
The patent implements a feedback mechanism where the OPS switch status is monitored and communicated back to the remote end through a messaging channel. The remote end receives OPS switching indication and automatically switches its OPS in response, ensuring synchronized operation. This feedback loop eliminates the performance deltas that occur in conventional schemes where manual switching is required, thereby maintaining both fast restoration and consistent optical performance.
Solution Approach 2:
The patent introduces a messaging channel as an intermediary between the local and remote OPS systems. This intermediary carries the OPS switching indication and enables automatic coordination without requiring manual intervention or additional optical components like shutters. The messaging channel facilitates reliable synchronization while maintaining the fast restoration capability of conventional OPS schemes.
2Reliability
If optical shutter is introduced for synchronization, then synchronized switching is achieved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical/optical shutter mechanism with an electronic messaging-based coordination system. Instead of using physical shutters to trigger synchronized switching, the system uses a messaging channel to communicate switch status and trigger automatic OPS switching at the remote end. This substitution eliminates the need for additional optical components, reducing device complexity and cost while maintaining synchronization reliability.
Solution Approach 2:
The messaging channel serves as an intermediary that replaces the need for complex optical shutter mechanisms. By using this communication intermediary, the system achieves synchronized switching through software/firmware logic rather than additional hardware components, thereby reducing overall system complexity while maintaining reliable synchronization.
3Ease of repair
If manual switching is required at non-faulted end, then fiber path maintenance can be performed, but unnecessary traffic disruption occurs
Solution Approach 1:
The patent uses feedback from the messaging channel to automatically determine when switching is needed. The system receives OPS switching indication and automatically executes the switch, eliminating the need for manual intervention. This automatic response ensures that traffic is only disrupted when absolutely necessary, maintaining productivity while still enabling fiber maintenance when required.
Solution Approach 2:
The system performs self-service by automatically detecting the need for switching and executing the switch without human intervention. The OPS switching indication triggers an automatic response that maintains traffic continuity unless a switch is genuinely required for maintenance, thereby maximizing productivity while preserving repair capabilities.
4Adaptability or versatility
If diversified fiber paths are used for protection, then path diversity is achieved, but maintaining identical path characteristics becomes difficult
Solution Approach 1:
The patent acknowledges that diversified fiber paths will have different characteristics (length, loss, dispersion) and uses parameter changes to adapt to these differences. The system measures and compensates for path-specific parameters, allowing the use of truly diverse protection paths while maintaining consistent performance. This enables path diversity without requiring the impossible constraint of identical path characteristics.
Data Source
AI summary
Systems and methods describe synchronizing optical protection switching with an Optical Protection Switch (OPS) including a splitter on a transmit side to both a first fiber path and a second fiber path and a receive switch and monitoring port on a receive side with the receive switch set to only one of the first fiber path and the second fiber path. A method includes, responsive to detection of a fault on the first fiber path, generating a link Forward Defect Indication (FDI) and transmitting the link FDI over a messaging channel downstream; and utilizing the link FDI to generate an Optical Protection Switch Indicator (OPSI) status used by the OPS to cause a switch of the receive switch to the second fiber path.