Transponder Aggregator Optical Loopback for MD-ROADM Contention
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Solution Overview
Problem
Conventional multi-degree reconfigurable optical add/drop multiplexers (MD-ROADMs) face issues with colored, directional, and contention-based operations, limiting flexibility and causing blocking when multiple wavelengths need to be dropped simultaneously.
Innovation Solution
A multi-degree colorless, directionless, and contention-less reconfigurable optical add/drop multiplexer is designed with a transponder aggregator section using split-and-select switches and optical loopback capabilities, enabling remote reconfiguration and validation of fiber connections through optical line, local, and far-end path loopbacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional MD-ROADM with fixed predetermined wavelengths is used, then device complexity is reduced, but adaptability deteriorates due to colored operation limitations
Solution Approach 1:
Multiple add/drop ports are merged into a shared transponder pool through the transponder aggregator, which uses optical switching networks to dynamically connect any transponder to any port. This eliminates fixed wavelength assignments while managing complexity through centralized control logic.
Solution Approach 2:
Transponders become universal resources that can serve multiple degrees and wavelengths dynamically. The transponder aggregator provides multi-functional connectivity, allowing the same transponder to be assigned to different wavelengths and ports based on real-time network demands.
2Adaptability or versatility
If separate add/drop operations at each degree are implemented, then device complexity is reduced, but adaptability deteriorates due to directional operation limitations
Solution Approach 1:
Add and drop operations from multiple degrees are merged into a unified transponder pool. The optical switching network in the transponder aggregator enables any transponder to be connected to any degree dynamically, allowing directions to share transponder resources rather than having dedicated resources per direction.
Solution Approach 2:
The system transitions from static directional assignments to dynamic cross-connections. The transponder aggregator uses controllable optical switches that can reconfigure connections in real-time, allowing the same transponder to serve different directions at different times based on network demands.
3Productivity
If same wavelength from multiple degrees is dropped simultaneously, then wavelength utilization is improved, but reliability deteriorates due to contention blocking
Solution Approach 1:
The transponder aggregator acts as an intermediary resource pool between multiple degrees. When the same wavelength needs to be dropped from multiple degrees simultaneously, the aggregator provides additional transponder instances or alternative routing paths, mediating the contention and ensuring all connections are guaranteed without blocking.
Solution Approach 2:
The system performs preliminary resource allocation and conflict detection through centralized control. Before establishing connections, the transponder aggregator pre-allocates transponder resources and detects potential contentions, resolving conflicts in advance to prevent blocking and ensure reliable simultaneous connections.
4Productivity
If manual configuration is used, then device complexity is reduced, but productivity deteriorates due to high operation costs
Solution Approach 1:
The transponder aggregator implements self-service through automated control systems that dynamically allocate and reconfigure transponder resources without manual intervention. The system monitors network demands and automatically establishes, modifies, or tears down connections based on real-time conditions, enabling fast reconfiguration.
Solution Approach 2:
The control system incorporates feedback mechanisms that monitor network status, transponder availability, and connection demands. This feedback enables automated decision-making for resource allocation, allowing the system to adapt dynamically and perform fast reconfiguration in response to changing network conditions.
Data Source
AI summary
The present principles are directed to a transponder aggregator-based optical loopback in a multi-degree colorless, directionless, contention-less, reconfigurable optical add/drop multiplexer. The multiplexer includes a reconfigurable optical add/drop multiplexer section for performing connect operations for wavelength division multiplexing signals among all degrees. The section has a plurality of subsections. Each of the subsections corresponds to a respective one of the degrees and has an optical separator at an input side and an optical combiner at an output side. The multiplexer further includes a transponder aggregator section having a split-and-select switch-based transponder aggregator. The multiplexer also includes an optical line loopback having a connection path between the optical separator at the input side and the optical combiner at the output side of at least one of the subsections.