Single-mode fiber birefringence measurement device and method

A single-mode optical fiber and birefringence technology, which is applied in the direction of measuring devices, optical instrument testing, testing optical fiber/optical waveguide equipment, etc., can solve the problems of expensive polarization analysis instruments, complex signal demodulation equipment, and restrictions on wide application, etc., to achieve The effect of simple structure, good application prospect and high measurement accuracy

Active Publication Date: 2017-05-17
HEILONGJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

People have proposed a variety of methods for measuring fiber birefringence, such as measuring fiber mode birefringence based on interferometry, but this type of method requires complex signal demodulation equipment; there are also methods based on manually rotating the polarizer to measure the change of the polarization state of the fiber, However, this method requires manual operation, and the measurement is inconvenient; in addition, the polarization analyzer can also be used to directly measure the birefringence of the fiber, but the price of the polarization analysis instrument is relatively expensive, usually hundreds of thousands or even millions, which limits its wide application

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  • Single-mode fiber birefringence measurement device and method
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  • Single-mode fiber birefringence measurement device and method

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specific Embodiment approach 1

[0022] Specific implementation mode 1. Combination figure 1 Describe this embodiment, a device for measuring the birefringence of a single-mode optical fiber described in this embodiment, which includes a pump light source, an optical isolator, a wavelength division multiplexer, a ring cavity fiber laser, a photodetector, and a spectrum acquisition module and data processing module; the ring cavity fiber laser includes fiber grating, erbium-doped fiber, fiber coupler, fiber ring structure, fixed platform and variable micro-displacement platform;

[0023] The optical signal of the pump light source passes through the optical fiber through the optical isolator to eliminate the reflected light and then transmits to the optical signal input end of the wavelength division multiplexer through the optical fiber. The optical signal output end of the wavelength division multiplexer is connected to one end of the fiber grating, and the grating fiber The other end of (104) is connected ...

specific Embodiment approach 2

[0025] Specific embodiment two, a kind of method for measuring the birefringence of single-mode optical fiber described in the present embodiment, the concrete steps of this method are:

[0026] Step 1, using the pumping light source to send the pumping light signal to the wavelength division multiplexer through the optical fiber, and the optical signal is input to the optical fiber ring structure through the optical fiber coupler after passing through the optical fiber grating and the erbium-doped optical fiber;

[0027] Step 2. Use the fixed platform to fix one end of the erbium-doped fiber, and use a variable micro-displacement platform to achieve axial stretching of the erbium-doped fiber, so that the length of the erbium-doped fiber, the effective refractive index of the laser mode and the birefringence of the fiber Produce changes; obtain laser signals with birefringence changes;

[0028] Step 3: Use the optical fiber ring structure to reflect the incoming optical signal...

specific Embodiment approach 3

[0031] Specific embodiment three. This embodiment is a further description of a method for measuring the birefringence of a single-mode optical fiber described in the second specific embodiment. The specific method for obtaining the birefringence information of the optical fiber caused by the axial strain described in step five is as follows: :

[0032] Step 51. According to the laser mode theory, the frequency of the qth order longitudinal mode signal in the ring cavity fiber laser is obtained; the frequency of the qth order longitudinal mode signal in the ring cavity fiber laser is expressed as:

[0033] f=qc / (nL) (1)

[0034] Among them, q is the order of the laser longitudinal mode, c is the speed of light propagation in vacuum, n is the effective refractive index of the laser mode, and L is the effective cavity length of the ring cavity fiber laser;

[0035] Step 52: After the multi-longitudinal mode laser output by the ring cavity fiber laser is detected by the photodet...

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Abstract

The invention provides a single-mode fiber birefringence measurement device and method, belongs to the technology of fiber sensing, and relates to a single-mode fiber birefringence measurement method. The device and method aim to achieve single-mode fiber birefringence measurement. An optical signal of a pump light source is transmitted to an optical signal input end of a wavelength division multiplexer through an optical fiber after passing an optoisolator, an optical signal output end of the wavelength division multiplexer is connected with one end of a fiber grating, the other end of the fiber grating is connected with one end of an erbium-doped fiber, the other end of the erbium-doped fiber is connected with one signal end of an optical fiber coupler, the other two signal ends of the optical fiber coupler are connected with two signal ends of a fiber annular structure respectively, a sensing signal output end of the wavelength division multiplexer outputs a laser signal to a light sensing face of a photoelectric detector, and a signal output end of a frequency spectrum acquisition module is connected with a frequency spectrum signal input end of a data processing module. The device and method are used for measuring birefringence changes of a single-mode fiber.

Description

technical field [0001] The invention belongs to optical fiber sensing technology, in particular to a method for measuring single-mode optical fiber birefringence. Background technique [0002] Optical fiber birefringence is an important characteristic parameter of optical fiber. It determines some polarization characteristics of optical fiber, such as polarization mode dispersion, polarization state control and nonlinear polarization rotation, etc., which affects the performance of optical fiber devices and optical fiber communication. Therefore, the birefringence of optical fiber The research and measurement of the effect is of great significance in the fields of optical fiber communication, optical fiber sensing, and optical device fabrication. People have proposed a variety of methods for measuring fiber birefringence, such as measuring fiber mode birefringence based on interferometry, but this type of method requires complex signal demodulation equipment; there are also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/00
CPCG01M11/30
Inventor 于秀娟陈雪峰刘盛春张金涛胡蕴薪
Owner HEILONGJIANG UNIV
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