Method for low loss welding and end face treatment of photonic crystal optical fiber

Abstract

The invention discloses a method for low loss welding and end face treatment of a photonic crystal optical fiber, and belongs to the technical field of photonic crystal optical fiber post-treatment. The method comprises the following steps of: cutting the photonic crystal optical fiber and another optical fiber to be welded with the photonic crystal optical fiber by using an optical fiber cutter; performing tapering treatment on the optical fiber which has a large diameter not matched with the diameter of a model field according to specific parameters of the two optical fibers so that the optical fiber is matched with the model field of the optical fiber to be welded; placing the two optical fibers of which the end faces are treated into an optical fiber welding machine and welding the two optical fibers; performing collapse treatment on one side end face of the welded photonic crystal optical fiber in accordance with the requirement through welding loss measurement and flattening the end face of the welded optical fiber at the other end by using the cutter; and grinding and polishing the two ends by using a grinder so as to obtain flat and smooth solid end faces. By the method, model field matching of butted optical fibers is realized; and the method is suitable for low loss welding among photonic crystal optical fibers as well as between the photonic crystal optical fiber and a common optical fiber.

Description

technical field [0001] The invention belongs to the technical field of subsequent processing of photonic crystal optical fibers, and in particular relates to a method for low-loss fusion splicing and end face processing of photonic crystal optical fibers. technical background [0002] Since the advent of photonic crystal fiber in 1996, with its unique properties and design freedom, it has become a new bright spot in the field of optical fiber, effectively expanding the research direction and scope of optical fiber. This kind of fiber has many singular characteristics that cannot be compared with traditional fibers, such as infinite cut-off single-mode, controllable dispersion, high nonlinearity, high birefringence, etc., and is currently widely used in optical communications, photonic crystal fiber lasers, high-performance optical fibers device field. However, the unique "air hole-quartz" structure of photonic crystal fiber also brings many problems. If the untreated fiber...

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Problems solved by technology

Both methods have the problems of complex system and high cost, and the application occasions are often limited

CO 2 Although the laser welding method has obvious advantages in dealing with the problem of small hole collapse, many research and development institutions do not have CO 2 Laser welding equipment is still not easy to promote

However, traditional commercial fusion splicers can be used to perform simple fusion splicing operations, and the requirements for the environment are not very strict. However, in the processing of photonic crystal fibers, which is different from ordinary optical fibers, there are still many problems in direct fusion splicing, especially when the mode field is not good. Matching will introduce a lot of loss

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