Self-correlation-based system for optical time domain reflectometry (OTDR) system to measure single-mode optical fiber beat-length
A single-mode optical fiber and system measurement technology, which is applied in the direction of testing optical performance, can solve the problems affecting the fiber coupling ability and the difficulty of changing cycle, and achieve the effects of low cost, improved detection accuracy, and controllable operation
Inactive Publication Date: 2013-05-01
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 light, then passes through the isolator and 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 beam through the circulator mode test fiber. Singlemode test fiber diameter is 125 μm. Different linearly polarized light will be back Rayleigh scattered somewhere in the ...
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The invention discloses a self-correlation-based system for an optical time domain reflectometry (OTDR) system to measure single-mode optical fiber beat-length, and the system comprises a narrow line-width laser, a pulse modulator, an isolator, a polarization controller, a circulator, a single-mode test optical fiber, a data collection unit and an information processing system, wherein the narrow line-width laser generated by the narrow line-width laser is modulated by the pulse modulator to produce pulse laser, the pulse laser sequentially passes through the isolator and the polarization controller, the optical power of components in an x direction and a y direction is generally equivalent to each other after the pulse laser passing through the polarization controller, then the pulse laser enters the single-mode test optical fiber through the circulator, a port I of the circulator is used as an input end to be connected with the polarization controller through a connection optical fiber, a port 2 of the circulator is connected with the single-mode test optical fiber, and a port 3 of the circulator is connected with a photovoltaic detector in the data collection unit through a connection optical fiber. The beat-length of the test optical fiber is calculated by detecting the interference light outputted by the port of the circulator. The self-correlation-based system is novel in design, simple in experimental equipment and capable of high efficiently and accurately measuring the beat-length of the test optical fiber to research the stress double-refraction effect in the optical fiber and measure the stress or strain and temperature of the optical 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