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System for analyzing polarization characteristics of full-automatic optical fiber

A characteristic analysis and fully automatic technology, applied in the field of signal system, can solve problems such as complex structure, unfavorable system practicality and integration, poor stability of rotating motor, etc., and achieve the effect of improving resolution and detection accuracy

Inactive Publication Date: 2012-06-27
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor stability of the rotating motor and the overly complicated structure, it is not conducive to the practicality and integration of the system

Method used

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  • System for analyzing polarization characteristics of full-automatic optical fiber
  • System for analyzing polarization characteristics of full-automatic optical fiber
  • System for analyzing polarization characteristics of full-automatic optical fiber

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0031] Figure 2a Shown is an embodiment of a linearly polarized light output device for the system. The laser light input by the laser 101 is converted into parallel light after passing through the fiber adapter 102 and the self-focusing lens 103 , and then passes through the YIG crystal 104 . According to the Faraday effect, the direction of the main polarization axis of the outgoing light is adjusted to be consistent with the direction of the polarization axis of the polarizer 106 . In order to realize the fully automatic measurement of the polarization characteristic parameters of the optical fiber to be tested, the linearly polarized light passing through the polarizer 106 passes through the YIG crystal 107, the self-focusing lens 109 and the fiber adapter 110, and then is connected to the optical fiber system to be tested. By adjusting the direct current flowing through the electromagnetic coil 108, the polarization direction of the outgoing linear polarization of the Y...

Embodiment 2

[0037] The polarized light generating device in embodiment 2 is the same as that in embodiment 1, but the structure of the polarizing device is different. Figure 2c It is a schematic diagram of the structure of the polarization analyzer in this embodiment. In this embodiment, a 1 / 4 glass slide is added, and the angle between the main axis of the glass slide and the polarization direction of the analyzer is adjusted to 0° and 45° respectively by using a magnetic rotation device. The change of the output light intensity in these two states is measured, and the complete polarization information of the incident light is analyzed.

[0038] The device is composed of the following components: an optical fiber adapter 301 at the input end, self-focusing lenses 302, 309 at both ends, YIG crystals 303, 306, electromagnetic coils 304, 307, drive signal synthesizers 311, 312, 1 / 4 slide 305, and Polarizer 308 , photodetector 310 , data acquisition card 313 , and computer analysis system 3...

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Abstract

The invention discloses a system for analyzing polarization characteristics of a full-automatic optical fiber, belonging to the field of signal systems. The system consists of a polarized light generating device and a polarization analyzer, wherein the polarized light generating device comprises a laser, a first optical fiber adapter, a first self-focusing lens, a first magnetic rotation device, a polarizer, a second magnetic rotation device, a second self-focusing lens and a second optical fiber adapter which are sequentially arranged in the light transmission direction. The first magnetic rotation device and the second magnetic rotation device both comprise electromagnetic coils and crystals arranged in the coils. According to the invention, the magnetic rotation characteristics of the YIG (yttrium iron garnet) crystals are utilized, and the strength of a magnetic field generated by the electromagnetic coils is controlled through signals, so that the deflection angle of a polarization plane of the incident light can be accurately controlled; and meanwhile, the countershaft error possibly generated by mechanical rotation can be avoided.

Description

technical field [0001] The invention relates to the field of signaling systems. Specifically, it is a fully automatic optical fiber polarization characteristic analysis system for optical signal processing, laser output laser polarization characteristic analysis or polarization maintaining fiber polarization characteristic test. Background technique [0002] The polarizers or analyzers used in the current optical automatic polarization analysis system products are structures that use mechanical devices to rotate polarizers, analyzers or wave plates to analyze the polarization characteristics of incident light. For the automatic polarization analysis system, the components of the rotating polarizer, analyzer or wave plate are realized by stepping motors or servo motors with angle resolution devices. For the manual polarization analysis system, the components of the rotating polarizer, analyzer or wave plate are realized by manual rotation and fixed angle resolution disc. On...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
Inventor 延凤平李琦彭万敬陶沛琳刘鹏冯亭孟涛谢燕平
Owner BEIJING JIAOTONG UNIV