Optical Network Wavelength Switching for PON Reliability
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Solution Overview
Problem
Passive optical networks (PONs) face reliability issues due to the lack of redundancy in signal transmission, leading to potential interruptions in service when optical devices or pathways fail, especially during software downloads or maintenance.
Innovation Solution
Implementing a system where multiple optical devices operate on separate wavelengths across different pathways, allowing for seamless switching of traffic in case of failures, with a controller managing the operation of these devices to minimize interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple optical devices operate on separate wavelengths across different pathways, then reliability is improved, but device complexity increases
Solution Approach 1:
The optical network is segmented into multiple independent wavelength pathways (e.g., wavelength 1, wavelength 2, etc.), each capable of carrying traffic separately. When one pathway fails, traffic is switched to another wavelength, ensuring service continuity without requiring complete system redundancy.
Solution Approach 2:
Optical devices are designed to handle multiple wavelengths simultaneously, making them multi-functional. A single optical device can process traffic on different wavelengths through the same physical infrastructure, reducing the need for separate dedicated devices for each wavelength while maintaining reliability.
2Reliability
If traffic is switched to another wavelength during pathway failure, then service interruption is minimized, but control complexity increases
Solution Approach 1:
The controller continuously monitors the status of optical pathways and wavelengths. When a failure is detected, the controller automatically triggers wavelength switching by receiving status feedback and initiating appropriate control actions to redirect traffic, minimizing service interruption.
Solution Approach 2:
The system pre-configures multiple wavelength pathways and establishes switching rules in advance. When a failure occurs, the controller can immediately execute pre-planned switching actions without needing to calculate optimal paths in real-time, reducing service interruption time.
Data Source
AI summary
Optical devices in optical network exchange signals at a plurality of wavelengths via a plurality of pathways. Each of the optical devices is associated with a corresponding wavelength and includes multiple optical inputs/outputs (I/Os) to exchange signals at the corresponding wavelength via the plurality of pathways. During maintenance or failure of one of the optical I/Os in an optical device associated with a wavelength, communications are maintained in the optical network by switching communications at a same wavelength to another a different pathway and/or reforming the optical network using other wavelengths. For example, an optical network unit (ONU) may identify an error in a first wavelength associated with a first optical device included in an optical line terminal (OLT) and may forward data using a second wavelength associated with the other optical device included in the OLT.