Optical Connection Validation in ROADM Nodes
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Solution Overview
Problem
In Reconfigurable Optical Add-Drop Multiplexer (ROADM) nodes, validating the continuity and losses of all fibers within multi-fiber cables, including unused ones, is challenging due to the complexity of multi-fiber connectors, which can disrupt running traffic during node upgrades and is costly due to the need for extensive optical components.
Innovation Solution
A method and system for validating connections by using light sources and photodetectors to confirm optical continuity across all fibers, including unused ones, through the implementation of loopback connectors and shared light sources within the Fiber Interconnection Module (FIM), allowing for automated and efficient validation of fiber connections without disrupting operational traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical filtering methods are used to validate fiber connections, then connection validation can be performed, but it disrupts running traffic and requires extensive optical components increasing cost
Solution Approach 1:
The patent introduces a light source coupled to the common input port and a photodetector coupled to the common output port as intermediary devices. These mediators enable connection validation by injecting test light into the fiber network and detecting returned light, thereby validating connections without requiring extensive optical filtering components at each validation point and without disrupting running traffic
Solution Approach 2:
The system utilizes the existing fiber infrastructure and WSS modules to reflect or return test light through the same paths used for actual signal transmission. The light source and photodetector leverage the existing optical components (couplers, splitters, WSS) to perform self-validation, eliminating the need for separate validation-specific optical components
2Reliability
If all fiber connections including unused ones are validated, then maintenance quality is improved, but validation time and operational disruption increase
Solution Approach 1:
The patent enables validation of all fiber connections including unused ones before they are activated or before maintenance operations begin. By performing preliminary validation of the entire fiber infrastructure using the light source and photodetector system, potential issues are identified in advance, preventing service disruptions when connections are later activated or maintained
Solution Approach 2:
The validation system operates by injecting continuous or periodic test light through the fiber network and continuously monitoring returned light at the photodetector. This continuous validation capability allows for real-time monitoring of all fiber connections without interrupting normal traffic flow, maintaining both validation and operational functions simultaneously
3Difficulty of detecting and measuring
If extensive optical components are deployed for validation, then connection validation capability is improved, but system cost increases
Solution Approach 1:
The light source and photodetector are designed as universal validation components that can validate any fiber connection within the network by coupling to the common input/output ports. The same validation system can validate used, unused, or newly installed fibers without requiring additional specialized components, making the validation capability multi-functional and cost-effective
Solution Approach 2:
The patent merges the validation function with the existing signal transmission path by using the same common input port and common output port that carry both validation light and operational traffic. The couplers and splitters in the network serve dual purposes: routing operational signals and facilitating validation light injection/detection, thereby reducing the need for separate validation-specific optical components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient and cost-effective validation of all fiber connections within the ROADM node, ensuring continuity and low losses, even for fibers not currently in use, thereby reducing maintenance disruptions and operational costs.
Implementation Method 1
A light source coupled to a first port of a first module is controlled to emit light. A determination is made whether or not the light is received at a second port
Implementation Method 2
A determination is made whether or not the light is received at a first photo-detector connected to a second port
Data Source
AI summary
A method of validating connections in an optical add/drop multiplexer (OADM) that includes a plurality of modules configured to route optical signals through the OADM, and at least one multi-fiber cable connecting modules of the OADM. A light source coupled to a first port of a first module is controlled to emit a test light. A determination is made whether or not the test light is received at a first photo-detector connected to a second port. Continuity of a connection between the first port and the second port is validated when the test light is received at the first photo-detector.