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Study on length calibration method of coherent optical time domain reflectometer

机译：相干光时域反射计的长度校准方法研究

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In order to meet the length calibration requirements of coherent optical time domain reflectometer(COTDR) in state monitoring of long-distance communication, a new coherent optical time domain reflectometer length calibration method was proposed. The method utilized the principle that light circulated continuously in the fiber ring. And based on the principle, the COTDR length calibration device was developed. The device used the pulse frequency and pulse width emitted by the function generator to control the breaking time of the optical switch. Thereby it could realize the control of the propagation time of the light in the fiber loop. If a fiber amplifier was added to the fiber loop, simulation of fiber links of different lengths could be realized. Finally, the length calibration of the coherent optical time domain reflectometer was achieved. The experimental results showed that the length of the fiber used in the device is 150km, and the optical pulse could be rotated up to 7 times in the fiber loop. Therefore, the maximum range of the coherent optical time domain reflectometer length calibration was 1050km. Its extended uncertainty was 7.0m, and the containing factor was 2. This method could not only promote the development of coherent optical time domain reflectometry technology, but also provided a good idea for COTDR length calibration.
机译：为了满足长距离通信的状态监测中相干光学时域反射计（COTDR）的长度校准要求，提出了一种新的相干光学时域反射计长校准方法。该方法利用光在纤维环中连续循环的原理。基于原理，开发了COTDR长度校准装置。该器件使用函数发生器发射的脉冲频率和脉冲宽度来控制光学开关的断开时间。因此，它可以实现光纤循环中光的传播时间的控制。如果将光纤放大器添加到光纤环上，则可以实现不同长度的光纤链路的模拟。最后，实现了相干光学时域反射仪的长度校准。实验结果表明，该装置中使用的纤维的长度为150km，光脉冲可以在光纤环中旋转高达7次。因此，相干光学时域反射计长度校准的最大范围为1050km。其延长的不确定性为7.0米，含有因子为2.该方法不仅可以促进相干光学时域反射仪技术的开发，还提供了对Cotdr长度校准的好主意。

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