Novel optical fiber docking device

Abstract

The invention relates to a novel optical fiber docking device which comprises a tubular structure made of memory alloy, wherein the tubular structure is formed by three pipes with different inner diameters and thicknesses; the inner diameter of the second pipe is minimum, and the relation among the initial inner diameter DT1 and the inner diameter DT2 after low-temperature expansion of the second pipe and optical fiber is (1) [1-(1-S)*K]*DF<DT1<DF and (2) DF<DT2<DF*(1+S*K), wherein the DF is the outer diameter of the optical fiber during docking, the K is a shape memory strain coefficient of the tubular structure made of the memory alloy, and the S is a selected proportionality coefficient; and the inner diameter of the first pipe and the third pipe of the tubular structure is larger relative to that of the second pipe, and the relation among the initial inner diameter DC1 and the inner diameter DC2 after low-temperature expansion of the first pipe and the third pipe and the coated outer diameter DS of the optical fiber is (3) [1-(1-S)*K]*DS<DC1<DS and (4) DS<DC2<DS*(1+S*K). The device has the characteristics of low cost, simplicity and convenience in use and good long-term stability.

Description

technical field [0001] The invention relates to a device for connecting optical fibers, in particular to a device for connecting ends of optical fibers by using memory alloy tubes. Background technique [0002] Optical fiber has been widely used in various regions of the world as a communication line, and it also has great application prospects as a new type of sensing device. Since most of the optical fibers currently used in practice are silica fibers, their core diameters are generally in the range of 4-80 microns, so the requirements for optical fiber joints are very high, such as single-mode optical fibers. The core diameter is generally between 8-10 microns Between two optical fibers, there will be a large loss if the joint deviation of the two optical fibers is one micron. The Chinese patent application No. 201020519978.6 "An Optical Fiber Docking Device" discloses an optical fiber docking device processed by a memory alloy material, which has a simple structure, is ...

AI Technical Summary

Problems solved by technology

However, the optical fiber docking device disclosed in this patent still has problems in actual use. The optical fiber docking device can only clamp the bare fiber part of the optical fiber and align the optical fiber, but there will be a gap between the bare fiber and the optical fiber that has not removed the coating layer. Leave a gap. Anyone who knows a little about optical fibers knows that without the protection of the coating layer, the strength of the bare fiber is very low, which will cause the bare fiber in the gap to break easily, resulting in the failure of the fiber connection.

Of course, this defect can also be filled with adhesives such as heat-shrinkable sleeves or epoxy resin to make up the gap, which will lead to problems such as increased volume, complicated operation, and reduced long-term reliability.

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