Optical fiber connecting method

Abstract

The invention provides an optical fiber connecting method comprising the following steps of: respectively removing small sections of coating layer on the respective ends to be connected of two sections of optical fibers to be connected to expose optical fiber cladding layers, and cutting end surfaces at the same inclined angle; placing the cut inclined end surfaces of the optical fibers to be connected in a way of clinging to complementing positions and welding the cut inclined end surfaces of the optical fibers to be connected together to finish angle welding of the optical fibers to be connected. The optical fiber connected by using the connecting method provided by the invention has the advantages that the optical feedback surface at a melting point is an inclined surface, so that reflected light returning along the original path is reduced, the optical feedback surface at the melting point hardly forms a laser resonant cavity together with other optical feedback surfaces in a system, oscillation of parasitic laser initiated by optical feedback of a low melting point can be reduced, the output power of ASE (airborne support equipment) is increased, the introduction of an optical isolator is even avoided, the loss and the cost are reduced, and the optical fiber connecting method is effectively applied to systems such as optical fiber laser and wideband superfluorescent optical fiber light source.

Description

technical field [0001] The invention relates to the technical field of optical fiber lasers, in particular to an optical fiber connection method. Background technique [0002] In various systems containing optical fibers, it is almost inevitable to have a low-loss, high-quality connection point between fibers, but due to the change in the refractive index of the fiber material on both sides of the connection point, formed at the connection point In the optical feedback surface, the feedback light may easily cause damage to the device or reduce the performance of the system in many cases. Optical fiber connectors widely used in communication systems, according to the different contact methods of pigtail end faces, there are two types: PC and APC. The coupling surface of the former is vertical, and the influence of echo reflection cannot be ignored in many cases; the latter The coupling surface of the connector is generally an end face with an angle of 8 degrees, so the echo ...

AI Technical Summary

Problems solved by technology

In order to achieve low-loss high-quality fusion splicing, it is generally necessary to treat the end face of the optical fiber to be vertical and flat, but this also introduces echo reflection at the melting point and various adverse effects it brings

[0004] For example, as an ideal broadband light source for fiber optic gyroscopes, optical tomography, medical diagnosis, and many other systems such as fiber optic sensing, fiber detection, and WDM optical communication, superfluorescent fiber light sources can directly achieve spontaneous emission by pumping high energy into doped fibers. Radiation amplification to obtain fiber optic superfluorescence seed source, but due to the existence of discrete optical elements or optical feedback at the melting point in this system, it is very easy for the gain to be greater than the loss in the cavity formed by the gain fiber to self-oscillate (P.Wang, J.K.Sahu, and W.A.Clarkson, "110W double-ended ytterbium-dopedber super-fluorescent source with M2=1.6", Opt.Lett.31, 3116-3118 (2006); Qirong Xiao, Ping Yan, Yaping Wang, Jinping Hao, and Mali Gong, "High-power all-fiber super-fluorescent source with fused angle-polishedside-pumping configuration", Appl.Opt., 50, 1164-1169(2011)), is extremely sensitive to the isolation of optical signals, and the output power is therefore severely restricted

But even if it is an all-fiber structure, the return loss at each melting point cannot be avoided. This part of the feedback will cause laser oscillation, reduce the laser threshold, and limit the maximum output power of ASE. It is necessary to introduce an optical isolator, which increases loss and cost. (Cao Yi, Liu Jiang, Wang Ke, Wang Pu, "All-Fiber Hundred-Watt-Level Broadband Ytterbium-Doped Double-Cladding Fiber Superfluorescent Source", Chin.J.Lasers., 39, 0802008(2012))

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