Optical Fault Supervision Using Single Frequency Signal
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Solution Overview
Problem
Optical transmission systems struggle to handle signals at different bit rates, leading to incorrect signal detection and failure to monitor multiple types of faults, resulting in faulty signals being outputted to downstream apparatuses.
Innovation Solution
An optical sending apparatus generates a fault information signal with a pre-set frequency when faults occur, which is transmitted instead of the original signal, and an optical receiving apparatus detects this frequency to halt output to the downstream apparatus, allowing for supervision of multiple fault types with a simple construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple frequency generating units are used to supervise different fault types, then fault supervision capability is improved, but device complexity increases
Solution Approach 1:
A single frequency generating unit generates a single frequency signal that is used to supervise multiple different fault types. The same frequency signal is transmitted through the optical fiber and can indicate various faults including fiber cuts, connector issues, and equipment failures, eliminating the need for multiple separate frequency generating units for different fault types.
Solution Approach 2:
Multiple fault supervision functions are merged into a single frequency generating unit and single frequency signal transmission system. Instead of having separate units for each fault type, the invention combines all fault supervision capabilities into one unified system that uses a single frequency to monitor multiple potential failure points in the optical transmission system.
2Measurement precision
If multiple frequency detecting units are used to detect different fault frequencies, then fault detection accuracy is improved, but device complexity increases
Solution Approach 1:
A single frequency detecting unit is capable of detecting the single frequency signal that indicates multiple different fault types. The detecting unit analyzes the presence and characteristics of this one frequency to identify various faults including fiber breaks, connector problems, and equipment failures, eliminating the need for multiple specialized detecting units.
Solution Approach 2:
Multiple fault detection functions are merged into a single frequency detecting unit that monitors one frequency signal. The unit combines multiple detection capabilities into one device, reducing system complexity while maintaining the ability to accurately identify different fault conditions through analysis of the single frequency signal.
3Device complexity
If a single frequency is used for fault information, then device complexity is reduced, but fault identification capability deteriorates
Solution Approach 1:
The single frequency signal acts as an intermediary carrier that conveys fault information from the fault location back to the monitoring system. By modulating or encoding fault type information onto this single frequency signal, the system maintains simple hardware while preserving the ability to identify different fault types through the characteristics of the frequency signal.
Solution Approach 2:
The system uses parameter changes in the single frequency signal to encode different fault types. By varying characteristics such as amplitude, phase, or pulse patterns of the single frequency, the system can distinguish between different fault conditions without requiring multiple different frequencies, thus maintaining device simplicity while preserving fault identification capability.
Data Source
AI summary
An optical transmission system for transmitting optical signals in which signals at different bit rates coexist, includes an optical sending apparatus for, when one or more faults are detected in a signal for transmission, generating a fault information signal with one frequency set in advance in accordance with the faults, converting the fault information signal into an optical signal, and sending out the optical signal, an optical transmission line for transmitting the optical signal sent out from the optical sending apparatus, and an optical receiving apparatus for receiving the optical signal transmitted through the optical transmission line, converting the received optical signal into an electric signal, detecting the fault information signal from the electric signal, and halting output of the electric signal to the outside.