Soft glass optical fiber splicing method

Abstract

The invention discloses a soft glass optical fiber splicing method. The method is performed in two stages, namely preheating treatment and heating splicing, by adding a preheating link in a splicing heating process and adopting a unidirectional pushing way, by virtue of a preheating process, the end face of a soft glass optical fiber is almost softened, and then the soft glass optical fiber is unidirectionally pushed into a to-be-spliced optical fiber having a relatively high softening temperature, thus splicing of the optical fibers is completed. Therefore, a too high splicing temperature isnot required, the soft glass optical fiber can be avoided from being excessively softened, and splicing efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of mid-infrared fiber lasers, and in particular relates to a soft glass fiber fusion splicing method. Background technique [0002] In recent years, the mid-infrared supercontinuum laser source (SC-MIR), which has unique application advantages in the fields of infrared directional jamming technology and ultra-long-distance communication, has become a research hotspot in the direction of fiber laser. Due to the limitation of intrinsic absorption loss, the loss of traditional silica fiber increases sharply when transmission is higher than 2.5 μm, so it is not suitable for SC-MIR generation. Fluoride (ZrF 4 -BaF 2 -LaF 3 -AlF 3 -NaF(ZBLAN) and InF 3 ), sulfide (As 2 S 3 and As 2 Se 3 ) and tellurite (TeO 2 and TeO 2 -BaF 2 -Y 2 o 3 ), represented by special soft glass fiber (SGF), which has a wide infrared transmission window and a large nonlinear refractive index, is one of the most ideal mid-inf...

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Problems solved by technology

[0004] 1. When the end face of the high softening temperature fiber can soften the end face of the low softening temperature fiber, the temperature of the end face of the high softening temperature fiber is higher, directly pushing the two kinds of fibers into each other, and the softening area of ​​the end face of the low softening temperature fiber will increase rapidly, resulting in The softening area of ​​the low softening temperature optical fiber is longer than the distance required for fusion splicing, and the accumulation distance of the two types of optical fibers after splicing is too large, which affects the splicing efficiency

[0005] 2. When mechanical force is used to push the softened low softening temperature fiber to the unsoftened high softening temperature fiber, it is easy to cause the deviation of the core of the low softening temperature fiber and the angle inclination between the two fibers, etc., thereby increasing the splice loss

[0006] 3. In the prior art, the discharge electrode is placed on the side of the high softening temperature optical fiber. Due to the high instantaneous temperature of the electrode discharge, in order to accurately control the softening degree of the fusion end of the low softening temperature optical fiber, the electrode needs to be offset by a large distance, which increases the complexity of the experiment. , reducing the precision of the propulsion

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