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COTDR method and system for synchronous monitoring of loss and disturbance events

A technology of event synchronization and light detection, which is applied in the testing of machines/structural components, reflectometers and measuring devices for detecting backscattered light in the time domain, can solve the problems of failure to realize early warning of damage events and economic losses, etc. Achieve the effect of improving the recognition rate, improving the measurement speed, and increasing the monitorable distance

Active Publication Date: 2021-04-02
FENGHUO COMM SCI & TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, COTDR, like OTDR systems, has a defect in the monitoring of optical fiber communication networks: when external disturbance events cause damage to the optical fiber, the change of optical fiber loss can be observed through OTDR and COTDR, and it is impossible to realize early warning of damage events. may even cause huge economic losses

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  • COTDR method and system for synchronous monitoring of loss and disturbance events
  • COTDR method and system for synchronous monitoring of loss and disturbance events
  • COTDR method and system for synchronous monitoring of loss and disturbance events

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Embodiment Construction

[0069] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0070] An embodiment of the present invention provides a COTDR method for synchronous monitoring of loss and disturbance events, including the following steps:

[0071] Through time-division multiplexing combined with frequency-division multiplexing, the laser generates detection light pulses of N frequencies in one cycle;

[0072] Detecting and synchronously receiving the detection optical pulses of N frequencies to obtain intermediate frequency signals containing two polarization states of N frequencies;

[0073] Collect two polarization state intermediate frequency signals of N frequencies, perform data processing, and obtain COTDR curves for loss monitoring and OTDR curves for vibration signal monitoring respectively.

[0074] As a preferred embodiment, detecting and synchronously receiving the detection optical pulses of N frequencies to ...

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Abstract

The invention discloses a COTDR method and system for synchronous monitoring of loss and disturbance events, relates to the technical field of optical fiber sensing, and can realize synchronous monitoring of loss and disturbance events. Through detection and synchronous reception of multi-frequency signals, the measurement speed of the COTDR system can be improved, coherent fading noise of an optical fiber link loss curve can be suppressed by selecting multi-frequency detection curves at intervals for cumulative averaging, events such as attenuation and joint reflection in a to-be-measured optical fiber are prevented from being submerged by the coherent fading noise, the monitoring event recognition rate and the detection dynamic range of a COTDR curve are improved, and the monitoring distance is increased; and meanwhile, the detection frequency range of the disturbance event can be improved by N times by emitting detection light pulses with N frequencies and independently measuring the obtained intermediate frequency signals with multiple frequencies.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a COTDR method and system for synchronous monitoring of loss and disturbance events. Background technique [0002] Optical fiber has been widely used in the field of communication because of its advantages such as large transmission bandwidth, small attenuation, and strong anti-interference ability. Therefore, optical fiber communication technology has become one of the main methods of modern communication. The global optical fiber laying mileage has reached billions of kilometers. However, due to human factors, the use environment, the decay of optical device performance, and the natural aging of optical cables, etc., failures in optical fiber transmission systems and communication interruptions occur frequently, and the number of failures continues to increase with time, making the failure rate of optical cable lines It is far greater than the equipment failure r...

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Application Information

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IPC IPC(8): G01M11/00G01H9/00
CPCG01M11/3109G01H9/004
Inventor 吴岩张益昕陈晓红张旭苹
Owner FENGHUO COMM SCI & TECH CO LTD