Optical fiber link detection system and method based on linear frequency modulation signal

Abstract

An optical fiber link detection system based on a linear frequency modulation signal relates to the field of optical fiber communication. The system comprises a laser, a linear frequency modulation transmitter, a circulator and a receiver, wherein the laser emits a continuous optical signal; the linear frequency modulation transmitter generates a repetitive pulse signal including a linear frequency modulation signal to act as a detection optical signal; the circulator inputs the detection optical signal into an optical fiber under test and receives a backscattered signal from the optical fiberunder test; and the receiver extracts the features of the optical fiber under test carried in the backscattered signal and outputs a curve track of the detection signal. By adopting the scheme of theinvention, the dynamic range of measurement and the range resolution can be improved under the premise of the same time.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to an optical fiber link detection system and method based on chirp signals. Background technique [0002] Optical Time Domain Reflectometry (OTDR) technology is based on the principle of backscattering and reflection of light. It uses the backscattered light generated when light is transmitted in the optical fiber to obtain attenuation information. Understand the loss distribution of the fiber along the length, etc. Due to the uneven density of the fiber material, the uneven doping composition and the defects of the fiber itself, when the light pulse is transmitted in the fiber, it will be scattered due to the nature of the fiber itself, connectors, joints, bending or other similar events. reflection. A part of the scattered and reflected light will return to the optical time domain reflectometer (Optical Time Domain Reflectometer, OTDR), and the returned useful informa...

AI Technical Summary

Problems solved by technology

Oversampling increases the dynamic range of the measurement, but takes more time

Due to the limited power of the laser, to increase the energy of the incident signal, the only way to increase the pulse width of the transmitted signal is to reduce the distance resolution.

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