Double-port Faraday rotating mirror and circulator

A technology of Faraday rotating mirror and Faraday rotator, which can be used in instruments, light guides, optics, etc., and can solve problems such as inability to apply

Inactive Publication Date: 2016-11-23
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patents CN20141046502, CN201310646181, CN105589135A and other Faraday rotating mirrors are all designed based on the single-port principle, which solves the dispersion and temperature characteristics of Faraday rotating mirrors. This type of Faraday rotating mirror can only be used at the end of the optical path design system, and For fiber optic gyroscopes and sensing systems based on the wavelength reflection of Bragg gratings, fiber optic rings and Bragg gratings are single-port access devices, and the Faraday rotating mirror needs to be placed in the middle of the optical path. The traditional single-port Faraday rotating mirror cannot be applied.

Method used

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  • Double-port Faraday rotating mirror and circulator
  • Double-port Faraday rotating mirror and circulator
  • Double-port Faraday rotating mirror and circulator

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 2 As shown, the dual-port Faraday rotator of this embodiment includes a first polarization-maintaining fiber head 201, a first collimator 202, a Faraday rotator 203, a second collimator 204, and a second polarization-maintaining fiber head connected in sequence. 205; light is incident from the first polarization-maintaining fiber head 201; wherein, the first polarization-maintaining fiber head 201 and the second polarization-maintaining fiber head 205 are used to transmit the light beam and ensure that its polarization direction remains unchanged, the first collimator 202 and the second polarization-maintaining fiber head The two collimators 204 are used to converge the divergent light beams into parallel light beams; the rotation angle of the Faraday rotator 203 to the polarization direction of the light is 45 degrees, and the main optical axis direction of the first polarization-maintaining fiber head 201 is the same as that of the first polarization-ma...

Embodiment 2

[0024] Such as image 3 As shown, the dual-port Faraday rotator of this embodiment includes a first polarization-maintaining fiber head 301, a first collimator 302, a Faraday rotator 303, a second collimator 304, and a second polarization-maintaining fiber head connected in sequence. 305; light is incident from the second polarization-maintaining fiber head 305; wherein, the first polarization-maintaining fiber head 301 and the second polarization-maintaining fiber head 305 are used to transmit light beams and ensure that the polarization direction thereof remains unchanged, the first collimator 302 and the second polarization-maintaining fiber head 305 The two collimators 304 are used to converge the divergent light beams into parallel light beams; the rotation angle of the Faraday rotator 303 to the polarization direction of the light is 45 degrees, and the main optical axis direction of the first polarization-maintaining optical fiber head 301 is the same as that of the firs...

Embodiment 3

[0027] Such as Figure 4As shown, the circulator based on the dual-port Faraday rotator of this embodiment includes a first polarization-maintaining fiber head 401, a first collimator 402, a Faraday rotator 403, a second collimator 404, and a second Polarization maintaining fiber head 405, Bragg fiber grating 406. Wherein, the first polarization-maintaining fiber head 401 and the second polarization-maintaining fiber head 405 are used to transmit the light beam and ensure that its polarization direction remains unchanged, and the first collimator 402 and the second collimator 403 are used to converge the divergent light beam into For a parallel beam, the Faraday rotator 403 is used to rotate the polarization direction of the beam by 45 degrees, and the Bragg fiber grating 406 is used to reflect polarized light of a certain wavelength.

[0028] In this embodiment, the polarization direction of the incident light beam is only the vertical polarization direction. The light beam ...

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Abstract

The invention relates to the field of optical fiber communication, in particular to a double-port Faraday rotating mirror and a circulator. A light beam enters one end of a double-port Faraday rotating mirror, emerges from the other end after the polarization direction deflects for 45 degrees, is transmitted to a following reflection-type light path system, is reflected, then enters the double-port Faraday rotating mirror and emerges from an original incidence port after the polarization direction deflects again for 45 degrees, 90-degree deflection can be conducted on the polarization direction of the light beam, and the working effect same as a single-port Faraday rotating mirror is achieved. The light path of the double-port Faraday rotating mirror is symmetrically designed, light path transmission has no direction selectivity, two ends can serve as light beam incidence ends, the influence on the Faraday rotating mirror of chromatic dispersion and temperature characteristics is eliminated, the working effect same as the single-port Faraday rotating mirror is achieved is achieved, and the double-port Faraday rotating mirror can be installed in a middle light path section and is suitable for different light path systems.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a dual-port Faraday rotating mirror and a circulator. Background technique [0002] Optical fiber sensing technology is widely used in aerospace, navigation and inertial navigation and other fields. A large number of polarization-maintaining devices are used in sensors made by the principle of polarization interference, such as fiber optic gyroscopes and fiber-optic hydrophones. The Faraday rotator is the key polarization-maintaining device, which mainly deflects the polarization direction of the beam by 90 degrees. [0003] Basically, the polarization-maintaining Faraday rotating mirrors in the single-port mode are basically on the market. The schematic diagram of its structure and optical path is shown in figure 1 As shown, it includes a fiber optic head 101, a collimator 102, a Faraday rotator 103, and a mirror 104. The incident light enters from the fiber optic hea...

Claims

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Application Information

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IPC IPC(8): G02B6/27G02B6/26
CPCG02B6/264G02B6/2766
Inventor 战丽丽
Owner SHANDONG UNIV OF SCI & TECH
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