Optical Subcarrier Dual-Path Protection for Network Reliability
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Solution Overview
Problem
Optical communications networks face disruptions due to severed or malfunctioning optical links, leading to connectivity issues and reliability degradation, as existing systems lack effective redundancy and quality-based signal selection mechanisms.
Innovation Solution
Implementing a system where network devices transmit data using multiple optical subcarriers over different paths, with a 'working' and 'protection' path configuration, allowing seamless data recovery even if one path is severed or degraded, using wavelength selective switches and optical splitters to manage and select signals based on quality metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single optical link is used for data transmission, then the device complexity is reduced, but the network reliability deteriorates when the link is severed or malfunctions
Solution Approach 1:
The optical communication system is segmented into multiple independent transmission paths (first optical path and second optical path), each capable of carrying data separately. This segmentation allows the system to maintain reliability by switching between paths while managing complexity through modular path management.
Solution Approach 2:
The system performs preliminary actions by pre-configuring protection paths and monitoring their status in advance. When a fault is detected on the working path, the system can immediately switch to the pre-prepared protection path without delay, maintaining network reliability while keeping the switching mechanism relatively simple.
2Reliability
If multiple optical paths are used for data transmission, then the network reliability is improved, but the device complexity increases
Solution Approach 1:
The system merges multiple optical paths (working path and protection path) into a unified transmission framework where both paths share common monitoring and control mechanisms. This merging approach improves reliability through path diversity while reducing device complexity by consolidating management functions.
Solution Approach 2:
The optical communication system implements multi-functionality by enabling each optical path to serve dual purposes: as a working path for normal data transmission and as a protection path for fault recovery. This universality improves reliability without requiring separate dedicated protection infrastructure, thereby limiting the increase in device complexity.
3Loss of information
If optical signals are transmitted without quality monitoring, then the ease of operation is improved, but the loss of information increases when signals are degraded
Solution Approach 1:
The system implements feedback mechanisms by continuously monitoring the quality of optical signals on both working and protection paths. This feedback enables the system to detect signal degradation and automatically switch to alternative paths or adjust transmission parameters, ensuring data integrity while maintaining ease of operation through automated quality-based decision-making.
Data Source
AI summary
An example system includes a first network device having first circuitry. The first network device is configured to perform operations including receiving data to be transmitted to a second network device over an optical communications network, and transmitting first information and second information to the second device. The first information is indicative of the data, and is transmitted using a first communications link of the optical communications network and using a first subset of optical subcarriers. The second information is indicative of the data, and is transmitted using a second communications link of the optical communications network and using a second subset of optical subcarriers. The first subset of optical subcarriers is different from the second subset of optical subcarriers.