Preparation method for heat diffusion optical fiber and device thereof

Abstract

The invention discloses a manufacturing method and a device for a thermal diffusion optical fiber. The manufacturing method comprises the following procedures: (1) optical fiber array is fixed in a clamp, and gaps are retained between the optical fibers; (2) at least one strip-shaped object of good high-temperature endurance ability and heat-conducting performance is fixed at each of the two edges of the fiber array; (3) the fiber array and the clamp are fixed between two micro heaters faced to each other; (4) by heating optical fibers by the micro heaters, the heating time is about 30 to 60 minutes, and at the same time, the part of the optical fiber array which is needed to be diffused can move forth and back between the micro heaters. The key point of the device to realize the above manufacturing method is the special design of the clamp. The method of the invention is of simple technique, easy operation, and can manufactures a plurality of TEC optical fibers once; the diameter of the largest mode field can reach up to 55um, the diameter error of mode field is less than 5 percent in the same manufacturing process.

Description

technical field [0001] The invention relates to a method and a device for preparing a thermal diffusion optical fiber. Background technique [0002] In recent years, with the development of optical communication technology, higher and higher requirements have been put forward for optical devices. When these devices are coupled and connected, especially in the coupling of large-scale waveguide arrays, ordinary optical fibers are used to realize all channels in the array. Fast and precise coupling alignment is difficult. Moreover, the coupling between optical fibers and between optical fibers and other waveguide devices is also relatively difficult. [0003] When a single-mode fiber is heated, germanium (Ge) in the core diffuses to the cladding, thereby changing the mode field diameter of the fiber. Such a fiber is called a thermal diffusion fiber (TEC), which is a fiber that increases coupling efficiency. In 1988, S. Kawakami of Tohoku University in Japan proposed a method ...

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Problems solved by technology

O.Hanaizumi and S.Kawakami of Tohoku University in Japan used a resistance heating furnace. Although multiple TEC fibers can be prepared at the same time, the heating time of this method is long (about 45 hours), and the mode field diameter is not uniform. no practical application

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