Optical Add-Drop Node Transient Control via Signal Replacement
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Solution Overview
Problem
Optical add-drop multiplexers (OADMs) in DWDM networks face challenges in maintaining optical quality and stability due to sudden changes in optical power caused by fiber cuts or disconnected inputs, which existing technologies struggle to address quickly enough to avoid noticeable network disruptions.
Innovation Solution
A method and apparatus that monitor optical signals for interruptions and replace interrupted signals with replacement signals having similar optical profiles, thereby suppressing transient power changes without requiring adjustments to optical amplifier parameters, using a controller and input selector to manage the replacement signals and maintain stable amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of input channels passing through an optical amplifier is suddenly reduced, then the optical power of remaining channels increases, but this degrades optical quality and causes transient power changes
Solution Approach 1:
The system performs preliminary action by detecting channel interruptions and replacing them with dummy channels before the optical amplifier can respond to the power change. This prevents the transient power increase that would otherwise occur when channels are removed, thereby maintaining optical quality without requiring the amplifier to adjust its operation.
2Reliability
If optical amplifier pump conditions are re-adjusted to restore desired power levels, then optical quality is improved, but the response time is too slow to avoid noticeable network effects
Solution Approach 1:
The invention introduces an intermediary solution by inserting dummy channels that optically simulate the presence of actual data channels. These dummy channels act as a mediator between the interrupted optical signal and the optical amplifier, maintaining the amplifier's operating conditions without requiring slow pump power adjustments, thus achieving fast response while maintaining optical quality.
3Stability of the object's composition
If replacement optical signals are inserted to maintain amplifier operation, then transient power changes are suppressed, but the system complexity increases due to monitoring and replacement mechanisms
Solution Approach 1:
The system creates optical copies of the original input channels as dummy channels. These copies replicate the optical characteristics (power, wavelength, modulation format) of the interrupted channels, allowing the optical amplifier to continue operating under stable conditions. The copying approach maintains simplicity by using the same optical signal structure rather than requiring complex electronic monitoring and synthesis systems.
Data Source
AI summary
A method and apparatus for determining if an optical input signals has been interrupted and responsively replacing an interrupted optical input signal with a replacement optical signal having a similar optical profile (e.g., such as a loopback between OADMs within a backbone network), thereby insuring that transient-induced high speed optical amplifier adjustments are avoided.