Method and device for measuring distributed-type polarization maintaining optical fiber double refraction based on Brillouin dynamic grating

A polarization-maintaining optical fiber and dynamic grating technology, which is applied in the direction of testing optical performance, can solve the problems that long distance and high spatial resolution cannot be satisfied at the same time, and the measurement time is long, so as to achieve the effect of short measurement time and high spatial resolution

Inactive Publication Date: 2012-07-18
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing measurement time of polarization maintaining fiber birefringence is very long, and the long distance and high spatial resolution cannot be satisfied at the same time, and provides a distributed polarization maintaining fiber birefringence based on Brillouin dynamic grating. Refraction measurement method and device

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  • Method and device for measuring distributed-type polarization maintaining optical fiber double refraction based on Brillouin dynamic grating
  • Method and device for measuring distributed-type polarization maintaining optical fiber double refraction based on Brillouin dynamic grating
  • Method and device for measuring distributed-type polarization maintaining optical fiber double refraction based on Brillouin dynamic grating

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specific Embodiment approach 1

[0042] Specific implementation mode one: the following combination image 3 Describe this embodiment, the Brillouin dynamic grating-based distributed polarization-maintaining fiber birefringence measurement method described in this embodiment, inject pump pulse light at one end of the polarization-maintaining fiber to be tested, and follow the incident detection pulse light, the The pump pulse light is incident on one optical main axis of the polarization-maintaining fiber to be tested, and the detection pulse light is incident on the other optical main axis of the polarization-maintaining fiber to be tested,

[0043] Continuous pumping light is incident on the other end of the polarization-maintaining fiber to be tested, and the continuous pumping light and the pumping pulse light are incident on the same optical axis, and the continuous pumping light and the pumping pulsed light are in the same optical axis. Meet and stimulate Brillouin scattering in the polarization-maintai...

specific Embodiment approach 2

[0047] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the incident directions of the continuous pump light and the pump pulse light are opposite, and the propagation direction of the two light beams is the same as that of the polarization-maintaining fiber to be tested. The central axes are parallel. Others are the same as the first embodiment.

specific Embodiment approach 3

[0048] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the incident direction of the probe pulse light is the same as the incident direction of the pump pulse light, and the propagation direction of the probe pulse light is the same as that of the pump pulse light to be The central axis of the measured polarization maintaining fiber is parallel. Others are the same as the first or second embodiment.

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Abstract

The invention discloses a method and device for measuring distributed-type polarization maintaining optical fiber double refraction based on Brillouin dynamic grating, belonging to the field of optics and aiming at solving the problems that in the traditional technology for measuring the polarization maintaining optical fiber double refraction, the measuring time is very long, and the long distance resolution and the high spatial resolution cannot be met at the same time. The method disclosed by the invention comprises the following steps of: incoming a pumping pulsed light from one end of the polarization maintaining optical fiber to be tested, incoming a continuous pump light from the other end of the polarization maintaining optical fiber to be tested after incoming a probe pulse light, incoming the continuous pump light and the pumping pulsed light to the same optical principal axis, incoming the probe pulse light to the other optical principal axis, and generating the Brillouin dynamic grating as the continuous pump light and the pumping pulsed light are met in the polarization maintaining optical fiber to be tested and are simulated by Brillouin scattering; and reflecting the probe pulse light by the grating, injecting pumping pulsed light and the probe pulse lights with different frequencies repeatedly, obtaining the reflection light intensity of the polarization maintaining optical fiber to be tested in each position point in different frequencies, and thus obtaining the double refraction of the polarization maintaining optical fiber to be tested in each position point.

Description

technical field [0001] The invention relates to a distributed polarization-maintaining optical fiber birefringence measurement method and device based on a Brillouin dynamic grating, and belongs to the field of optics. Background technique [0002] Polarization-maintaining optical fiber has attracted great attention and extensive research because of its wide application in the field of optical fiber communication and optical fiber sensing. figure 1 Shown is a cross-sectional view of a widely used panda-type polarization-maintaining fiber. It has two optical principal axes, namely the fast axis and the slow axis. The refractive index of the fast axis is n f , the refractive index of the slow axis is n s , the difference between the refractive index of the fast axis and the slow axis is the birefringence of the polarization maintaining fiber, and the birefringence of the polarization maintaining fiber is one of the most important parameters in its application. Due to the inh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
Inventor 董永康吕志伟
Owner HARBIN INST OF TECH
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