Control system of Mach-Zehnder optical fiber interferometer polarization decline and phase decline

A technology of optical fiber interferometer and polarization fading, which is applied in optics, instruments, nonlinear optics, etc., to achieve the effect of reducing the problems of phase fading and polarization fading
CN101324441AInactive Publication Date: 2008-12-17BEIJING JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING JIAOTONG UNIV
Publication Date
2008-12-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a polarization fading and phase fading control system of a Mach-Zehnder interferometer, which comprises a closed-loop phase fading control system consisting of a first laser (1), a polarization modulator (8), a phase controller (10), a first photodetector (3) and a digital signal processor (11), and a closed-loop polarization fading control system consisting of a second laser (2), a polarization controller (7), a phase modulator (9), a second photodetector (4) and a digital signal processor (11). The first laser (1) and the second laser (2) simultaneously output laser in an interference path through a wavelength division multiplexer (5) and a wavelength division demultiplexer (6), the comprehensive utilization of the two laser beams with different wavelengths can simultaneously eliminate polarization fading and phase fading of the Mach-Zehnder interferometer, and the wavelengths of the output laser beams of the first laser (1) and the second laser (2) are finally stabilized on an arbitrary wave crest or in the trough position of an interference light power spectrum.
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Description

technical field

[0001] The invention relates to the fields of optical fiber communication and optical fiber sensing, and is especially suitable for the field of long-distance optical fiber sensing. Background technique

[0002] The Mach-Zehnder fiber optic interferometer is widely used in Interleaver technology and fiber optic sensing technology. The Mach-Zehnder fiber optic interferometer has two optical paths: an interference arm and a reference arm. The coherent light emitted by the light source enters the two arms from one end of the Mach-Zehnder fiber interferometer, and is coherently coupled out from the other end. Due to a certain length difference between the two arms, the coherent light in the two arms has a phase When the polarization state of the two coherent lights does not change, the output optical power has the following relationship with the wavelength:

[0003] P out = P ...

Claims

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