PON Protection Optical Switch Self-Diagnostic Method
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Solution Overview
Problem
Conventional PON protection systems, particularly the 'redundancy system OSU sharing type', face reliability issues due to the lack of redundancy in optical switches, which can lead to service disruptions when these switches fail, despite reducing OLT slot consumption and OSU introduction costs.
Innovation Solution
A self-diagnostic method is implemented to detect optical switch-related failures by comparing signal light between normal and redundancy system OSUs, using circuit configuration, open state, and no-signal state tests to identify abnormalities and prevent service interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the redundancy system OSU sharing type is used to reduce OLT slot consumption and OSU introduction costs, then cost and resource efficiency are improved, but reliability deteriorates due to lack of optical switch redundancy
Solution Approach 1:
The patent implements preliminary diagnostic actions by continuously monitoring optical signal characteristics (power, wavelength, modulation depth) before actual failures occur. The system performs self-diagnostics on the optical switch and its control circuitry, detecting potential failures in advance and enabling preventive maintenance, thus resolving the reliability issue without requiring additional redundant hardware that would increase cost.
2Quantity of substance
If the redundancy system OSU sharing type is used to reduce OLT slot consumption, then hardware resource efficiency is improved, but service continuity deteriorates when optical switch failures occur
Solution Approach 1:
The patent implements feedback mechanisms by continuously monitoring optical signal characteristics from the optical switch and control circuitry. The system compares measured parameters (optical power, wavelength, modulation depth) against reference values and triggers diagnostic routines when deviations are detected, enabling real-time assessment of system health and automatic protection switching before failures disrupt service.
3Device complexity
If conventional PON protection systems are used without self-diagnostic functions, then system simplicity is maintained, but failure detection capability deteriorates
Solution Approach 1:
The patent implements self-service functionality by enabling the optical switch and control circuitry to perform autonomous self-diagnostics. The system automatically monitors its own operational parameters, detects anomalies, and triggers protective actions without requiring external intervention or complex additional diagnostic equipment, thus maintaining system simplicity while improving failure detection capability.
Data Source
AI summary
A self-diagnostic method for PON protection system, in which optical switch-related failure can be previously inspected, and a PON protection system. A circuit is configured while an optical switch is switched so that signal light from an ONU is input to both a normal system OSU and a redundancy system OSU of an optical access network including the ONU, and there are conducted a circuit configuration test in which the signal light to the normal system OSU and the signal light to the redundancy system OSU are monitored for a predetermined period of time, and when the signal light to one of the OSUs and the signal light to the other do not correspond to each other, it is judged as abnormality and an open state test in which an optical switch is opened so that the signal light from the ONU is input to only the normal system OSU of the optical access network including the ONU, a circuit of the redundancy system OSU and the ONU is brought into an open state, the signal light to redundancy system OSU is monitored for a predetermined time of period, and when the signal light to the redundancy system exists, it is judged as abnormality.