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Polarization-preserving type fiber integrated Michelson interferometer

An interferometer and polarization-maintaining fiber technology, applied in the field of fiber-optic interferometers, can solve the problems of low-noise, high-sensitivity, large polarization fluctuation and noise of the interferometer without considering the polarization state of the fiber, and achieve stable polarization state, high resistance to Strong interference ability and good temperature stability

Inactive Publication Date: 2012-10-31
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polarization state in the fiber is not considered, and there are large polarization fluctuations and noise in the system, which makes it difficult to meet the requirements for low noise and high sensitivity of the interferometer

Method used

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  • Polarization-preserving type fiber integrated Michelson interferometer
  • Polarization-preserving type fiber integrated Michelson interferometer
  • Polarization-preserving type fiber integrated Michelson interferometer

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specific Embodiment approach 2

[0025] combine figure 2 , The second embodiment of the present invention is a polarization-maintaining fiber-integrated Michelson interferometer with a polarization circulator. On the basis of the first embodiment, the polarization circulator 9 is used to replace the optical isolator 2 and the micro beam splitter 3 .

specific Embodiment approach 3

[0026] combine image 3 , the third embodiment of the present invention, compared with the first embodiment, is to replace the mirror 8 with a pair of fiber grating I 10 and fiber grating II 11 with the same reflection spectrum, and can also realize two coherent The optical arm is integrated into a single optical fiber with a polarization-maintaining fiber-integrated Michelson interferometer, and the fiber grating is written using phase mask technology. This structure can use broadband light as a light source due to the wavelength selectivity of the fiber grating.

specific Embodiment approach 4

[0027] combine Figure 4 , the fourth specific embodiment of the present invention, compared with the first specific embodiment, the light source and photodetector adopt separate light source 1 and photodetector 4, through the pigtail fiber 13 of light source pigtail 12 and photodetector and coupling device 14 connection. Both the light source pigtail 12 and the photodetector pigtail 13 are polarization maintaining fibers, and the coupler 14 is a polarization coupler.

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Abstract

The invention provides a polarization-preserving type fiber integrated Michelson interferometer comprising a light source, a light splitting device, an optical detector, a single-core polarization-preserving optical fiber, a double-core polarization-preserving optical fiber and reflecting ends. The single-core polarization-preserving optical fiber is connected with the double-core polarization-preserving optical fiber by a tapered coupling zone, two interference arms with the reflecting ends are both integrated in one double-core polarization-preserving optical fiber, a light beam emitted by the light source is injected to the single-core polarization-preserving fiber after passing through the light splitting device, and then divided into two beams after passing through the tapered coupling zone, the two light beams are respectively coupled to two respectively independent fiber cores of the double-core polarization-preserving optical fiber, reflected back by the reflecting ends, interfered by the coupling zone again and then return to a common optical path part formed from the single-core polarization-preserving optical fiber to become the light beams containing interference signals; and the light beams containing the interference signals are reflected to the optical detector for receiving after passing through the light splitting device. The polarization-preserving type fiberintegrated Michelson interferometer has the characteristics of good polarization-preserving performance and high temperature stability.

Description

technical field [0001] The invention relates to an optical fiber interferometer in the field of optical fiber communication or sensor field. Background technique [0002] Optical fiber Michelson interferometer is a fiber optic interferometer commonly used in optoelectronic technology. It has flexible structure, anti-electromagnetic interference, and strong adaptability. Acoustic detection and underground nuclear explosion verification tests. It is an important physical basis for many high-sensitivity fiber optic sensors. Since the light transmission characteristics in the two reflection arms of the optical fiber can be affected by external conditions such as temperature and pressure, the optical fiber Michelson interferometer can realize the measurement of physical quantities such as optical fiber strain and temperature. The traditional optical fiber Michelson interferometer is composed of two independent and separated optical fiber interference arms. For example, in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/28G02B6/024G02B6/255
Inventor 关春颖苑立波张涛戴强田凤军
Owner HARBIN ENG UNIV
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