Optical-Transceiver Control Circuit for Stable Signal Output
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Solution Overview
Problem
In optical network systems, communication interruptions at the line side lead to unstable electric signal outputs due to prolonged conduction start processing times in optical-transceivers, particularly in digital coherent systems, which can fail to meet the switching time specifications for high-speed digital communication methods like SDH.
Innovation Solution
An optical-transceiver control circuit that generates a dummy signal with similar properties to the received optical signal and switches to this dummy signal during communication abnormalities, ensuring stable output and rapid recovery by preventing unlock in the Clock-Data-Recovery (CDR) module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical-transceiver performs prolonged conduction start processing to ensure stable signal reception, then the signal stability is improved, but the switching time exceeds the 50 ms specification requirement
Solution Approach 1:
The system performs preliminary actions by detecting communication abnormalities early and proactively switching to a dummy signal before the conduction start processing completes. This prevents the unstable intermediate state from occurring and ensures the switching time remains within 50 ms while maintaining signal stability through the dummy signal.
2Adaptability or versatility
If the optical-transceiver uses digital coherent system processing, then the signal processing capability is improved, but the conduction start processing time is prolonged causing intermittent signal outputs
Solution Approach 1:
The dummy signal acts as an intermediary that replaces the unstable electric signal during the prolonged conduction start processing period. This allows the digital coherent system to perform its complex processing without causing intermittent signal outputs to the client side, as the dummy signal provides continuous stable output.
3Loss of time
If the system switches to dummy signal during abnormality, then the switching time compliance is improved, but additional signal generation and switching components are required
Solution Approach 1:
The system changes the parameter state of the signal by switching between normal electric signal and dummy signal based on abnormality detection. This parameter change approach allows compliance with 50 ms switching time specification while the added complexity of dummy signal generation and switching components ensures reliable signal output during abnormal conditions.
Data Source
AI summary
This invention solves the problem that, if a loss of signal or other anomaly occurs on a line side, intermittent problems occur in a signal outputted to a client side, resulting in trouble with subsequent signal processing. This optical-transceiver control circuit comprises a signal-generating means for generating a dummy signal that has approximately the same characteristics as an electrical signal generated from an optical signal inputted to an optical transceiver, a switching means for receiving an electrical signal and selecting and outputting either the received electrical signal or the generated dummy signal, and a controlling means for changing the signal selected by the switching means from the electrical signal to the dummy signal if a notification indicating an anomaly in the optical signal is inputted.