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Method for producing probe pulse and coherent light time-domain reflector

A technology of time domain reflectometer and detection pulse, applied in the field of communication transmission, can solve the problems of deteriorating the working performance of COTDR, broadening the output light wave spectrum of the light source, failing to improve the resolution of optical fiber faults and positioning accuracy, etc., so as to improve the resolution and positioning accuracy. Accuracy, reduce coherent fading noise, avoid superposition effects

Active Publication Date: 2011-08-03
HUAWEI TECH CO LTD
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Problems solved by technology

[0005] However, the above-mentioned prior art will lead to broadening of the spectrum of the output light wave of the light source, which does not meet COTDR’s requirements for a narrow linewidth of the light source. When it is applied to COTDR, it will not only fail to improve the resolution and positioning accuracy of COTDR for fiber faults, Deterioration of the working performance of COTDR

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  • Method for producing probe pulse and coherent light time-domain reflector
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  • Method for producing probe pulse and coherent light time-domain reflector

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[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making an inventive step fall within the protection scope of the present invention.

[0027] An embodiment of the present invention provides a coherent optical time domain reflectometer, the structure of which is as follows figure 1 As mentioned above, the device includes: a control unit 10 , a drive unit 11 , a continuous light laser 12 , and a detection pulse generation unit 13 .

[0028] The control unit 10 is configured to generate a first pulse signal and a second pulse signal with the same period T, and the second pulse signal lags beh...

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Abstract

The invention relates to the field of communication transmission, in particular to a method for producing a probe pulse and a coherent light time-domain reflector. The coherent light time-domain reflector comprises a control unit, a drive unit, a continuous light laser and a detection pulse generating unit, wherein the control unit is used for generating a first pulse signal and a second pulse signal with same period T, the second pulse signal is lag behind the first pulse signal, the period T of the first pulse signal and the second pulse signal is not less than t+2L / C; the drive unit is used for generating a frequency change drive signal according to the first pulse signal; the continuous light laser is used for generating continuous light with unchangeable frequency change spectrum width under the drive of the frequency change drive signal; and the detection pulse generating unit is used for modulating the continuous light according to the second pulse signal to generate a detection pulse. The coherent light time-domain reflector provided by the embodiment of the invention has higher optical fiber failure resolution ratio and positioning accuracy.

Description

technical field [0001] The invention relates to the field of communication transmission, in particular to a method for generating detection pulses and a coherent optical time domain reflectometer. Background technique [0002] COTDR (Coherent Optical Time Domain Reflectometer, Coherent Optical Time Domain Reflectometer) and OTDR are generally used to locate faults (for example, broken fibers) of optical fiber and cable lines. Both OTDR and COTDR periodically send detection pulses to the optical fiber, and the detection pulses will undergo Rayleigh scattering at various points in the optical fiber. COTDR and OTDR receive the Rayleigh scattering signal from the optical signal scattered back from the optical fiber, and then Analyze the Rayleigh scattering signal to realize fiber fault location. Compared with ordinary OTDR, COTDR has the advantages of long positioning distance and so on. However, because it uses coherent technology to receive and process Rayleigh scattering sig...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/08H04B10/12H04B10/071
CPCH04B10/071G01M11/3127
Inventor 冯志勇邱少峰韦逸嘉
Owner HUAWEI TECH CO LTD
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