Optical Identifier Equipment for PON Fault Detection
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Solution Overview
Problem
Current OTDR systems struggle to accurately detect faults in branch fibers after an optical splitter in passive optical networks due to high splitting ratios, which result in low detection resolution and inability to differentiate reflection peaks.
Innovation Solution
The implementation of optical identifier equipment on backbone and branch fibers, using address codes to uniquely identify each fiber segment, allowing for precise fault detection by processing returned optical signals and extracting frequency components to determine address codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a wide test optical pulse is used to improve dynamic range of OTDR detection, then the detection range is improved, but the resolution of reflection event is lowered, so that the OTDR cannot differentiate intensive reflection peaks
Solution Approach 1:
The patent segments the optical detection process into multiple wavelength channels (1625nm and 1650nm) with different pulse widths. The 1625nm channel uses wider pulses for long-distance detection, while the 1650nm channel uses narrower pulses for high-resolution reflection event detection. This segmentation allows simultaneous optimization of both detection range and resolution without compromising either parameter.
2Reliability
If the OTDR uses 1625nm/1650nm wavelength to keep away from operating wavelength, then the online detection capability is improved, but the ability to detect faults in branch fibers after optical splitter is reduced due to high splitting ratio causing high loss
Solution Approach 1:
The patent applies local quality by using different pulse widths for different detection purposes. Narrower pulses are used when high resolution is needed for reflection event detection, while wider pulses are used when maximum dynamic range is required for long-distance detection. This local optimization of pulse parameters enables accurate fault detection in branch fibers while maintaining online detection capability.
3Productivity
If the OTDR sends optical signal for test and observes returned information to implement online detection, then the real-time monitoring is improved, but the ability to accurately locate faults in each branch fiber is reduced due to inability to differentiate intensive reflection peaks
Solution Approach 1:
The patent segments the detection wavelengths into 1625nm and 1650nm channels, each serving different detection objectives. The 1650nm channel with narrower pulses provides high-resolution reflection event detection for accurate fault location, while the 1625nm channel provides comprehensive coverage. This segmentation enables both fast online detection and precise fault location simultaneously.
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 fast and accurate fault detection and location in optical distribution networks, improving the stability of passive optical network systems by overcoming the limitations of existing OTDR systems.
Implementation Method 1
The optical identifier equipment reflects the optical signal back through the fiber
Data Source
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AI summary
The present invention provides a fault detection method and device of an optical distribution network, and an optical network system. At least one optical identifier equipment is disposed on a backbone fiber and is disposed on each branch fiber in the optical distribution network, and the optical identifier equipment uniquely identifies the backbone fiber through an address code and uniquely identifies each branch fiber through an address code. After an optical signal for test is sent to the optical distribution network, an optical signal returned from each optical identifier equipment in the optical distribution network is received and analyzed, and then an address code of each optical identifier equipment is obtained; and it is detected whether a fiber corresponding to the address code has a fault according to the obtained address code of each optical identifier equipment. The problem in the prior art that an OTDR cannot accurately detect whether each branch fiber after an optical splitter has a fault is solved, fast and accurate detection and location of a fault in the optical distribution network are implemented, and the stability of a passive optical network PON system is improved.