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OPTICAL TIME DOMAIN REFLECTOMETER, TEST METHOD OF OPTICAL TRANSMISSION LINE, AND TEST SYSTEM OF OPTICAL TRANSMISSION LINE
OPTICAL TIME DOMAIN REFLECTOMETER, TEST METHOD OF OPTICAL TRANSMISSION LINE, AND TEST SYSTEM OF OPTICAL TRANSMISSION LINE
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机译:光学时域反射计,光传输线的试验方法,以及光传输线的测试系统
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摘要
An optical detection unit detects a return light and outputs a detection signal. An optical multiplexer/demultiplexer outputs the monitoring light to the optical transmission line, and outputs the return light to the optical detection unit. A processing unit detects a first timing at which the detection signal becomes less than a first threshold value, detects a second timing at which the detection signal becomes less than a second threshold value, and calculates a first change rate of the detection signal in a period between the first and second timings. The processing unit changes the first and second threshold values to calculate the first change rate for a plurality of periods, and, when a second change rate between the first change rates in two adjacent periods is greater than a threshold value, either of the first and second timings in one period is detected as the breakage position.
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