Supervisory Optical Circuit for Subsea Amplifier Gain Monitoring
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Solution Overview
Problem
Subsea network operators face challenges in monitoring and optimizing the performance of submerged fiber-optic cable plants due to increasing bandwidth demands, requiring effective fault detection and diagnostics to maintain performance and upgradable capacity.
Innovation Solution
A bidirectional optical repeater system with two unidirectional optical amplifiers and a supervisory optical circuit that uses optical time-domain reflectometry to monitor the gains of optical amplifiers through three pathways, enabling remote monitoring and diagnostics of optical transport systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional monitoring methods are used in subsea optical networks, then system simplicity is maintained, but fault detection capability and performance monitoring are insufficient
Solution Approach 1:
The optical circuit performs multiple functions: it amplifies data signals in forward and reverse directions while simultaneously providing supervisory signal pathways for monitoring. This multi-functionality enables fault detection without adding separate dedicated monitoring equipment, thus improving reliability while controlling complexity.
Solution Approach 2:
A supervisory signal is introduced as an intermediary carrier that transports monitoring information through the optical circuit. This supervisory signal enables remote monitoring equipment to detect faults and measure amplifier gains without directly interfering with data transmission, resolving the contradiction between monitoring capability and system simplicity.
2Measurement precision
If multiple supervisory pathways are implemented, then monitoring precision and fault diagnostics are improved, but optical circuit complexity increases
Solution Approach 1:
The optical circuit is segmented into distinct supervisory signal pathways: a first pathway for forward direction monitoring and a second pathway for reverse direction monitoring. This segmentation allows independent monitoring of each amplifier with dedicated pathways, improving measurement precision while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
Different supervisory pathways are configured with different characteristics suited to their specific monitoring needs. The first pathway monitors the forward amplifier chain while the second pathway monitors the reverse amplifier chain, allowing optimized monitoring precision for each direction without requiring complex universal monitoring infrastructure.
3Productivity
If remote monitoring equipment is deployed, then maintenance efficiency is improved, but system cost and infrastructure complexity increase
Solution Approach 1:
The optical amplification circuit performs self-monitoring by incorporating supervisory signal pathways within its own structure. The circuit monitors its own amplifier gains and transmits this information remotely, enabling the system to serve its own monitoring needs without requiring extensive external monitoring infrastructure, thus improving maintenance efficiency while controlling complexity.
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
Enables accurate and efficient monitoring of individual optical amplifier gains, facilitating targeted maintenance and upgrades, improving fault detection and system performance in subsea networks.
Implementation Method 1
an optical circuit connected to optically couple the first optical path and the second optical path
Implementation Method 2
a first optical pathway configured to direct light from an output of the first optical amplifier to an input of the second optical amplifier
Implementation Method 3
the remote monitoring equipment of the corresponding optical transport system can use optical time-domain reflectometry, e.g., to determine and monitor, as a function of time, the individual gains of the first and second optical amplifiers
Data Source
AI summary
A bidirectional optical repeater having two unidirectional optical amplifiers and a supervisory optical circuit connected to optically couple the corresponding unidirectional optical paths. In an example embodiment, the supervisory optical circuit provides three pathways therethrough for supervisory optical signals, the first pathway being from the output of the first optical amplifier to the input of the second optical amplifier, the second pathway being between the input of the first optical amplifier and the input of the second optical amplifier, and the third pathway being from the output of the second optical amplifier to the input of the first optical amplifier. The pathways are arranged such that the remote monitoring equipment of the corresponding optical transport system can use optical time-domain reflectometry to determine and monitor, as a function of time, the individual gains of the first and second optical amplifiers.