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Single mode fiber length measuring system

A single-mode optical fiber and length measurement technology, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of optical fiber length measurement errors, errors in adjusting output light frequency, etc., and achieve the effect of improving measurement resolution and ensuring accuracy

Inactive Publication Date: 2012-06-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Since the acousto-optic modulator is based on the Doppler effect, there is an error in adjusting the frequency of the output light, which brings errors to the measurement of the fiber length

Method used

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Embodiment Construction

[0020] figure 1 The structure diagram of the single-mode optical fiber length measurement system is given. The output light of the pulse light source 1 is divided into two paths through the first fiber coupler 2. One path of light is converted into an electrical signal by the high-speed photoelectric conversion module 3 and then connected to the spectrum analyzer 4. , real-time dynamic scanning pulse light source 1 longitudinal mode interval. The other optical path is connected to the input end of the passive optical fiber ring cavity 5 composed of the second and third optical fiber couplers and the optical fiber to be tested, and the output end of the passive optical fiber ring cavity is connected to the spectrometer 6 . By adjusting the cavity length of the light source 1, when the cavity length of the passive fiber ring cavity 5 is close to an integer multiple of the cavity length of the light source 1, a series of transmission peaks can be observed on the spectrometer 6, a...

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Abstract

The invention relates to a single mode fiber length measuring system. The single mode fiber length measuring system is characterized in that a pulse light source is connected with a first optical fiber coupler by an optical fiber, an output end of the first optical fiber coupler is connected with a high-speed photoelectric conversion module which is connected with a spectrum analyzer; another output end of the first optical fiber coupler is connected with a passive optical fiber ring cavity consisting of a second optical fiber coupler, a third optical coupler and a single mode optical fiber with the length to be measured, and the passive optical fiber ring cavity is connected with a spectrometer. Compared with the traditional OTDR (Optical Time Domain Reflectometry) measuring method, the optical vernier effect is utilized, so that the measurement resolution is improved greatly. The single mode fiber length measuring system ensures the measuring precision by tracking the measurement drifting caused by unstable intervals between longitudinal modes of the tracking light source of the spectrum analyzer.

Description

technical field [0001] The invention relates to a single-mode optical fiber length measuring system. Background technique [0002] Accurate fiber length measurement is important in fiber optic communication and fiber optic sensing systems. [0003] The most commonly used optical fiber length test method is OTDR (Optical Time Domain Reflectometer). Its principle is to detect the backscattered light and Fresnel reflected light at the incident end face of the light, and perform signal processing to obtain the breakpoint, joint position and Fiber length and other information. OTDR has errors caused by many factors, as well as the measurement blind area caused by the response time of the detector, the resolution is not high, and the accuracy is limited. The common commercial OTDR has a measurement accuracy of about 1m. [0004] Optical fiber testing methods based on the Michelson interferometer structure mainly include OLCR (Low Coherent Optical Reflectometer), OFDR (Optical F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02
Inventor 鲁平张亮刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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