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A method and device for measuring optical fiber backscattering based on spread spectrum technology

A technology of backscattering and optical fiber, which is applied in the field of photoelectric detection, can solve the problems that light backscattering measurement cannot take into account the measurement accuracy and dynamic range, etc., and achieve the effects of performance improvement, dynamic range improvement and cost reduction

Active Publication Date: 2017-01-04
李卫
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Problems solved by technology

[0007] Existing light backscattering measurements cannot balance measurement accuracy and dynamic range well
The application of spread spectrum technology in these fields has good prospects in theory, but it faces the technical problem of how to realize bipolar codes in the optical domain and despreading in the optical domain

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  • A method and device for measuring optical fiber backscattering based on spread spectrum technology
  • A method and device for measuring optical fiber backscattering based on spread spectrum technology
  • A method and device for measuring optical fiber backscattering based on spread spectrum technology

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a light backscattering measurement based on spread spectrum technology, and the implementation cost is low.

[0032] The purpose of the present invention is to achieve through the following technical measures:

[0033] First, the transmission sequence is modulated into optical phase information by using the optical differential phase-shift key modulation format (DPSK), and sent to the optical path to be tested.

[0034] Optical differential phase shift keying modulation format is a new type of transmission technology in optical communication. The modulation principle of optical DPSK is to transmit information by using the optical carrier phase difference of adjacent bits. The transmission sequence is differentially precoded first, and then phase modulated. ...

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Abstract

The invention provides a method and device for measuring optical fiber backscattering based on spread spectrum technology. The method includes: phase-modulating the light source signal by using DPSK modulation in the sending sequence; the phase-modulated DPSK optical signal enters the optical path to be tested; the DPSK optical signal reflected or backscattered from the optical path to be measured passes through the first optical directional coupler or The optical circulator enters the delay interferometer to realize the demodulation of the DPSK optical signal; the photoelectric conversion is performed on the demodulated DPSK optical signal; the local sequence is used to despread the photoelectrically converted signal to measure the optical backscatter. The invention combines the optical DPSK modulation technology with the spread spectrum technology, realizes the bipolarity of the optical domain spread spectrum code, and improves the accuracy and dynamic range of the optical fiber backscattering measurement; realizes by modulating the phase of the delay interferometer The symbol multiplication operation in correlation despreading overcomes the electronic bottleneck in electric domain correlation despreading.

Description

technical field [0001] The invention relates to photoelectric detection technology, in particular to a method and device for measuring optical fiber backscattering based on spread spectrum technology. Background technique [0002] Scattering signals in optical fibers mainly include Rayleigh scattering, Raman scattering and Brillouin scattering. Optical fiber backscattering measurement is a method of measuring various scattering and Fresnel reflections at the light emitting end when light is transmitted in the optical fiber through certain positioning technology. [0003] Fiber optic backscatter measurements have two major application areas in the market today. One is to measure the link loss, insertion point loss and fault point location of the optical fiber, which is mainly realized by measuring the back Rayleigh scattering and Fresnel reflection of each point in the optical fiber; the second is mainly by measuring the back Raman scattering or back Brillouin scattering, u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/04G01J5/08H04B10/071H04B10/556
Inventor 李卫
Owner 李卫
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