Optical isolator

An optical isolator and isolator technology, applied in optics, instruments, optical components, etc., can solve the problems of high cost and large volume, and achieve the effect of cost reduction, good isolation effect, and elimination of polarization mode dispersion.

Inactive Publication Date: 2008-12-31
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide an optical isolator, whic

Method used

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Embodiment Construction

[0019] see figure 1 One end of the housing 7 of the present invention is the input fiber optic head 1, the other end is the output fiber optic head 5, and the spacer 2, the first self-focusing lens 3 and the The second self-focusing lens 4 , wherein the fiber head 1 at the input end, the isolator 2 , the first self-focusing lens 3 and the second self-focusing lens 4 are fixed in the glass sleeve 6 .

[0020] The isolator 2 is composed of a displacement crystal 201, a 45° Faraday rotator 202, a half-wave plate 203, and a displacement crystal 204 that are sequentially arranged in one piece. The angle between the optical axes is 90°, the walk-off planes of the first shifted crystal 201 and the second shifted crystal 204 are parallel, the walk-off amounts are the same, and the walk-off directions are opposite. 4 The angle between the optical axis between the half-wave plate 203 and the first displacement crystal 201 is 22.5°. The 45° Faraday rotator 202 is a magnetic rotator, or...

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Abstract

The invention provides an optical separator, consisting of an inlet optical fibre head, a separation body, two self-focus lenses and an outlet optical fibre head which are sequentially arranged; the separation body consists of a displacement-typed crystal, 45DEG Faraday rotary plate, a half-wave plate and a displacement-typed crystal which are sequentially arranged and fixedly connected with each other; the separated surfaces of the two displacement-typed crystals are parallel to each other, with the same separation quantity and reverse separation directions. The facing surfaces of the inlet optical fibre head and the first self-focus lens are parallel to each other and the facing surfaces of the outlet optical fibre head and the second self-focus lens are parallel to each other; the optical axes of the two self-focus lenses are parallel to each other, with the same focal length and coincident adjacent focal surfaces; the internal end surface of the inlet optical fibre head and the internal end surface of the outlet optical fibre head are arranged at an object/image conjugation position. The optical separator solves the technical problems of large volume and high cost in the background technique, and has the advantages of good separation effect and eliminating the polarization mode dispersion.

Description

technical field [0001] The invention relates to an optical isolator applied in the field of optical fiber communication. Background technique [0002] An optical isolator is an optical passive device that only allows one-way transmission of light. It is used to protect light-emitting devices such as lasers and optical amplifiers from interference from returning light. Optical isolators are divided into two types according to the dependence of polarization: polarization-dependent type and polarization-independent type. Since the polarization state of the light wave in the optical fiber is randomly changed in the optical fiber communication, a polarization-independent optical isolator is often used. [0003] There are many ways to implement polarization-independent optical isolators, and there are two main types: displacement (Displacer) optical isolators and wedge optical isolators. These two types are described in detail in the document "Polarization-Independent Optical Is...

Claims

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Application Information

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IPC IPC(8): G02B6/26G02F1/09G02B6/32G02B1/10G02B1/11
Inventor 张文松赵卫
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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