Optical isolator

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...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide an optical isolator, which solves the technical problems of large volume and high cost in the background art

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