Sagnac interferometer-based method and Sagnac interferometer-based device for testing beat length of polarization maintaining optical fiber
A polarization-maintaining optical fiber and testing device technology, applied in the direction of testing optical performance, etc., can solve the problem of low spatial resolution and achieve the effects of strong anti-interference ability, easy implementation, and simple principle
Inactive Publication Date: 2011-01-12
BEIHANG UNIV
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This method has simple equipment, is convenient and easy to implement, but it can only measure visible light, and the spatial resolution is low.
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[0024] like figure 1 As shown, the polarization-maintaining fiber beat length test device based on Sagnac interferometer of the present invention. The light source 1 is connected to the first input end of the fiber coupler 3 through the first optical fiber 2, that is, the A end, and the two ends of the polarization-maintaining fiber 5 to be tested are respectively connected to the fiber coupler through the second fiber 4 and the third fiber 6. The first input end of 3, that is, terminal C, is connected to the second output end, that is, terminal D, and the spectrum testing device 8 is connected to the second input end of fiber coupler 3, that is, terminal B, through the fourth optical fiber 7. Use optical fiber length measuring device 16 to measure the length value of the polarization-maintaining fiber to be tested, after spectrum measuring device 8 tests, obtain the wavelength difference Δλ between two adjacent maximum values or two minimum values in the transmission spec...
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The invention discloses a method and a device for testing the beat length of a polarization maintaining optical fiber, which establish a numerical model for the test of the beat length of the polarization maintaining optical fiber according to the spectrum modulation property of a transmission spectrum of a Sagnac interferometer consisting of an optical fiber coupler and a to-be-tested polarization maintaining optical fiber and the extreme point property of the transmission spectrum to test the wavelength difference between the adjacent extreme points of the transmission spectrum obtained by using a spectrum test device to realize the test of the beat length. The method and the device optimize the length parameters of the to-be-tested polarization maintaining optical fiber, establish a mathematical model for acquiring the optimal test length of the optical fiber and precisely test the beat length of the optical fiber at the optimal test length. The method for testing the beat length of the polarization maintaining optical fiber of the invention is simple in theory and achieves a precision of 0.01 millimeter of the beat length test performed at the optimal test length. The test device adopts a full optical fiber structure, and is low in cost, high in adaptability, strong in interference resisting capability and free from limitation on the beat length of the to-be-test optical fiber. The test method and the test device are suitable for the tests of beat lengths in various ranges of the polarization maintaining optical fibers. The device is simple in structure and convenient in operation.
Description
technical field [0001] The invention relates to a polarization-maintaining optical fiber testing method and testing device, more particularly to a polarization-maintaining optical fiber beat length testing method and testing device based on a Sagnac interferometer, belonging to the field of polarization-maintaining optical fiber testing and optical fiber sensing. Background technique [0002] Polarization-maintaining fiber has been widely used in the field of optical fiber sensing technology and optical fiber communication because of its strong polarization-maintaining ability for linearly polarized light and excellent compatibility with general single-mode optical fiber. The polarization-maintaining ability of polarization-maintaining fiber is obtained by generating a strong birefringence in the fiber. Birefringence is the basic characteristic of polarization-maintaining fiber, and it needs to be accurately measured and controlled during the development, production and appli...
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IPC IPC(8): G01M11/02
Inventor 杨远洪徐春娇杨明伟段玮倩杨巍张萍萍
Owner BEIHANG UNIV