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System for detecting polarization maintaining optical fiber beat length

A polarization-maintaining optical fiber and detection system technology, which is applied in optical instrument testing, machine/structural component testing, measuring devices, etc., can solve the problems of low cost of measuring instruments and the influence of the minimum value of the beat length, etc., and achieves a simple and easy measurement method. performance, improve measurement accuracy, and reduce vibration and noise

Inactive Publication Date: 2009-04-08
BEIHANG UNIV
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  • Description
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Problems solved by technology

This method has low cost of measuring instruments and simple measurement method, but the minimum value of the beat length that can be measured is affected by the magnetic gap width of the applied magnetic field

Method used

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  • System for detecting polarization maintaining optical fiber beat length
  • System for detecting polarization maintaining optical fiber beat length
  • System for detecting polarization maintaining optical fiber beat length

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027]Please refer to shown in Fig. 2, the present invention is a kind of detection system to the beat length of polarization-maintaining optical fiber, by wide-spectrum light source 1, optical fiber polarizer 2, photodetector 9, Michelson interferometer, signal generator 12, lock It consists of a phase amplifier 13, a computer and a beat length detection device stored in the computer. Described Michelson interferometer comprises coupling lens 4, analyzer mirror 5, spectroscope 6, reference mirror 7 and measurement mirror 8, and the optical path relation of these five mirrors is: (A) the light that couples through coupling lens 4 enters detector On the polarizer 5, the light after the analyzer 5 is incident on the beam splitter 6; (B) the light incident on the beam splitter 6 is transmitted to the reference mirror 7, and the light reflected by the reference m...

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Abstract

The present invention discloses a detection system for detecting beat length of polarization-holding optic fibre. Said system includes the following several portions: wide-spectrum light source, fibre polarizer, Michelson interferometer, photoelectric detector, preamplification circuit, phase-locked amplifier, signal generator, computer and beat length detection device, etc. Besides, said invention also provides the working principle of said detection system and its operation method and steps.

Description

technical field [0001] The invention relates to a beat length detection system for measuring the measured polarization maintaining optical fiber. The beat length detection system is composed of a hardware part and a software part. Background technique [0002] Polarization-maintaining fiber uses the shape birefringence or stress birefringence of the waveguide to maintain polarization. Stress is now widely used to achieve birefringence, that is, an additional material with a thermal expansion coefficient larger than quartz is used to generate stress in the optical fiber. When making a strained polarization-maintaining fiber, a fiber preform is made by placing two highly doped silica rods (usually boron, phosphorus, or aluminum) on either side of the core. The fiber is drawn into an optical fiber at high temperature. After the fiber is drawn, the two highly doped rods shrink when cooling, but their heat shrinkage is affected by the surrounding quartz, so that the highly doped...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/00
Inventor 杨远洪贾岩蒋大钢牛清红
Owner BEIHANG UNIV
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