Optical fiber isolator

Abstract

The invention provides an optical fiber isolator. The optical fiber isolator comprises a glass encapsulating tube, a first tail-fiber capillary tube, a second tail-fiber capillary tube, a first lens, a second lens and a rotary optical component, wherein the rotary optical component, the first lens and the second lens are all mounted in the glass encapsulating tube, and the first lens and the second lens are located at the two sides of the rotary optical component and are fixed; the first tail-fiber capillary tube extends into a first open end of the glass encapsulating tube and is fixed, and the second tail-fiber capillary tube extends into a second open end of the glass encapsulating tube and is fixed. According to the optical fiber isolator, structurally, after the conventional collimator glass tube is omitted, an adhesive layer between the collimator glass tube and a capillary tube is omitted, the water vapor permeation resistance of the device is improved, the gas tightness is improved, and a structural stress resulting from different coefficients of thermal expansion and non-uniform thickness of media is reduced, so that the global stability and reliability of the device are improved.

Description

technical field [0001] The invention relates to an optical fiber isolator, in particular to a low-cost new structure miniature optical fiber online isolator, which belongs to the field of optical fiber communication. Background technique [0002] Miniature fiber optic in-line isolators are usually packaged by two fiber optic collimators, Faraday rotation cores, and glass tubes with all-glue technology. figure 1 Shown is the existing conventional miniature optical fiber in-line isolator, which uses a pigtail capillary 11 and a lens 12 with an outer diameter of 1.0 mm, and puts them into a glass tube 13 with an outer diameter of 1.8 mm to make the first fiber collimator. A 1.0mm pigtail capillary 32 and a lens 31 are put into a glass tube 33 with an outer diameter of 1.8mm to make a second fiber collimator, and the cost of the two collimators is high. The Faraday rotation core 2 is made by using the crystal prism 22, the crystal prism 24 and the Faraday optical rotation plate...

AI Technical Summary

Problems solved by technology

figure 1 Shown is the existing conventional miniature optical fiber in-line isolator, which uses a pigtail capillary 11 and a lens 12 with an outer diameter of 1.0 mm, and puts them into a glass tube 13 with an outer diameter of 1.8 mm to make the first fiber collimator. 1.0mm pigtail capillary 32 and lens 31 are packed into a glass tube 33 with an outer diameter of 1.8mm to make a second fiber collimator, and the cost of the two collimators is high

Use the crystal prism 22, crystal prism 24 and Faraday optical rotation plate 23 with a light-passing surface of 0.68mm×0.68mm to be placed in the magnetic ring 21 to make the Faraday rotation optical core 2, and the cost of the optical rotation core is high.

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