Standby Broadband Light Source for PON Service Continuity
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Solution Overview
Problem
In passive optical networks using injection-locked transmitters, the failure of a broadband light source disrupts service to multiple subscribers, as the upstream and downstream signals depend on the operability of this seeding source, leading to potential service disruptions and challenges in maintaining continuity.
Innovation Solution
A system is implemented with an active broadband light source and a standby broadband light source, along with a monitoring device that detects failures and seamlessly switches from the active to the standby source, ensuring continuous service. The standby source can be shared among multiple networks, reducing power consumption and the need for multiple backups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single active broadband light source is used to provide service to a DWDM PON, then the device complexity and cost are reduced, but the reliability of service continuity deteriorates when the light source fails
Solution Approach 1:
A standby broadband light source is pre-configured and maintained in a ready state before failure occurs. The standby source is kept synchronized and prepared to immediately take over service provision when the active source fails, eliminating service interruption.
Solution Approach 2:
The system incorporates a backup light source as a protective measure against the active source failure. This redundancy acts as a cushion against potential service disruption, ensuring that when the active source fails, the standby source can immediately compensate and maintain service continuity.
2Reliability
If a standby broadband light source is maintained in readiness, then the reliability of service continuity is improved, but the use of energy and device complexity increase
Solution Approach 1:
The system dynamically adjusts the operational state of the standby light source based on the health status of the active source. The standby source can be partially powered or in a low-power standby mode during normal operation, and only fully activated when failure is detected, optimizing energy consumption while maintaining reliability.
Solution Approach 2:
A monitoring device continuously monitors the active broadband light source for failures. When a failure is detected, the system provides feedback to switch from the active source to the standby source. This feedback mechanism ensures that the standby source is only fully activated when necessary, reducing unnecessary energy consumption.
3Reliability
If multiple active broadband light sources are used for different DWDM PONs, then the reliability of each individual PON is improved, but the overall device complexity and cost increase
Solution Approach 1:
The standby broadband light source is designed to be universally compatible and can serve as a backup for any of the multiple DWDM PONs. Instead of having dedicated standby sources for each PON, a single standby source can replace any failed active source across different PONs, reducing overall system complexity and cost while maintaining reliability.
Data Source
AI summary
Techniques are disclosed for a broadband service provider to maintain continuity of service in the event that a broadband light source fails in a passive optical network which uses injection-locked transmitters. Generally, a first broadband light source is connected to a passive optical network. Should the first broadband light source fails, it is disconnected from the network, and a second broadband light source is connected to the network.