A system for measuring the beat length of single-mode fiber based on an autocoherent otdr system
A single-mode optical fiber and system measurement technology, which is applied in the direction of testing optical performance, etc., can solve the problems of changing cycle difficulties and affecting the coupling ability of optical fibers, and achieve the effects of improved detection accuracy, low cost, and simple and easy methods
Inactive Publication Date: 2016-01-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
Using the lateral pressure method, it is difficult to obtain a stable change period because the magnitude, direction and position of the applied compressive stress will affect the coupling ability of the fiber
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[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0019] Such as figure 1 As shown, it is a schematic diagram of the structure of the optical fiber beat length measurement system based on self-coherence OTDR, in which the light source is a narrow linewidth laser. The working wavelength is 1540nm-1560nm, the typical value is 1550nm. The line width is less than 0.1nm. The narrow linewidth laser generated by the narrow linewidth laser passes through the modulator to generate pulsed laser, then passes through the isolator and the polarization controller in turn, after passing through the polarization controller, the optical power of the x and y direction components is roughly equal, and then coupled into the single laser through the circulator mode test fiber. The single-mode test fiber diameter is 125 μm. Different linearly polarized light will be back Rayleigh scattered somewhere in the op...
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The invention discloses a system for measuring the beat length of a single-mode optical fiber based on a self-coherent OTDR system, comprising a narrow line width laser, a pulse modulator, an isolator, a polarization controller, a circulator, a single-mode test optical fiber, a data acquisition unit, and a In the information processing system, the narrow-line-width laser generated by the narrow-line-width laser generates pulsed laser light through the modulator, and then passes through the isolator and the polarization controller in turn. The circulator is coupled into the single-mode test fiber, the 1 port of the circulator is connected to the polarization controller through the connecting fiber as the input end, the 2 port is connected to the single-mode test fiber, and the 3 port is connected to the photodetector in the data acquisition unit through the connecting fiber. The beat length of the test fiber is calculated by detecting the interference light output from the circulator port. The system is novel in design and simple in experimental equipment. It can efficiently and accurately measure the beat length of the test fiber, so as to study the stress birefringence effect in the fiber, and measure the stress or strain and temperature of the fiber.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to a system for measuring optical fiber beat length based on an OTDR system and adopting the principle of self-coherence. Background technique [0002] With the development of optical fiber technology, the research of distributed optical fiber sensor has become one of the most representative emerging technologies, and its application has gradually developed from the military field to various industrial fields such as electric power, petroleum, petrochemical, transportation and construction. So far, it has been proved that fiber optic sensors can be applied to the measurement of more than 70 physical quantities such as displacement, vibration, rotation, pressure, bending, strain, speed, acceleration, current, magnetic field, voltage, temperature, sound field, flow rate, concentration, and pH value. Among them, stress or strain has become one of the most meas...
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IPC IPC(8): G01M11/02
Inventor 欧中华陈玉卢磊岳慧敏李剑锋刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA