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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

Inactive Publication Date: 2008-12-17
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The traditional way to resist these two types of fading is to manually adjust the two types of fading by introducing a polarization controller or a phase controller, but this is only suitable for short-distance interfering optical paths and environmental conditions that change slowly, and in the process of adjustment Had to temporarily stop working on the interferometer

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Select a device with the following parameters:

[0025] The first laser 1: the working wavelength is 980nm;

[0026] The second laser 2: the working wavelength is 1550nm;

[0027] Wavelength division multiplexer 5: 980 / 1550nm;

[0028] WDM6: 980 / 1550nm;

[0029] Polarization controller 7 and polarization modulator 8: OZ Optics EPC-300;

[0030] Phase controller 9 and phase modulator 10: PZ1-STD-FC / PC;

[0031] Digital signal processor 11: TMS320C6202 chip;

[0032] Ordinary single-mode optical fiber 15~18: the length is 5m;

[0033] The first photodetector 3 and the second photodetector 4 are common photodetectors.

[0034] The Mach-Zehnder fiber optic interferometer polarization fading and phase fading control system, the connections that make up the system:

[0035] An output end of the splitter 12 is connected with an end of the phase modulator 9 through a common single-mode fiber 15, and the other end of the phase modulator 9 is connected with an end of the c...

Embodiment 2

[0042] The Mach-Zehnder fiber optic interferometer polarization fading and phase fading control system, the connections that constitute the system are the same as those in Embodiment 1, and only the parameters of the following devices are different:

[0043] The first laser 1: the working wavelength is 1550nm;

[0044] The second laser 2: the working wavelength is 1310nm;

[0045] Wavelength division multiplexer 5: 1310 / 1550nm;

[0046] WDM6: 1310 / 1550nm;

[0047] Ordinary single-mode fiber 15-18: the length is 500m.

[0048] In the present invention, a wavelength division multiplexer 5 and a wavelength division multiplexer 6 with a working range of 980nm to 1570nm are used, and the minimum frequency interval between the output laser of the first laser 1 and the output laser of the second laser 2 is 100 GHz, both of which can realize the present invention beneficial effect.

[0049] Depend on figure 2 It can be seen that the wavelength of the laser output from the first ...

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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.

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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Application Information

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IPC IPC(8): G01D5/26G02F1/01G02F1/21
Inventor 赵瑞峰裴丽祁春慧阮乂马中秀宁提纲董小伟郭兰吴树强
Owner BEIJING JIAOTONG UNIV
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