Double-M-shaped electric heating device for multicore fiber fusion

Abstract

The invention relates to a double M-shaped electric heating device for multi-core optical fiber fusion, which is used in a fusion tapered system to prepare optical passive devices. A double M-shaped electric heating device for multi-core optical fiber melting, the double M-shaped heating device is composed of two identical M-shaped graphite heating elements and a ceramic cover, the first M-shaped graphite heating element and the second M-shaped graphite heating element The concave structure in the middle of the body forms a ring-shaped area as a heating area. The M-shaped heating element should be placed in a ceramic cover, and the internal structure of the ceramic cover is closely matched with the M-shaped graphite heating element. The invention can conveniently control the heating power, as long as one or more of the three parameters of current, voltage or the resistance of the heating body itself can be changed arbitrarily, the heating power can be changed, and an ideal temperature field can be easily obtained.

Description

Technical field [0001] The invention relates to a double M-shaped electric heating device used for fusion of multi-core optical fibers, which is used in a fusion tapering system for preparing optical passive devices. Background technique [0002] Optical passive devices are important devices in the field of optical fiber communication. They are usually produced by the fusion tapering method, that is, a section of bare optical fiber of two (or more) optical fibers is melted at a high temperature, and at the same time, tension is applied in the molten area to make the optical fiber form a double cone. The shape is usually called a taper. The degree of tapering of optical fiber devices in different melting areas is different. To maintain the consistency of the performance of the optical fiber devices in each zone, a suitable temperature field distribution must be matched with the tapering process. [0003] At present, the cone-drawing equipment usually adopts flame heating generated ...

AI Technical Summary

Problems solved by technology

[0004] (1) Hydrogen-oxygen flame will produce [OH] in the optical fiber - , when it enters the optical fiber, it will increase the loss of the optical fiber device and reduce the reliability of the optical fiber device;

[0005] (2) The flame heating is unstable, and it is easy to drift due to the influence of the environment, resulting in poor performance consistency of optical fiber devices;

[0006] (3) There are potential safety hazards in the gas combustion system;

[0007] (4) The temperature adjustment range of the flame is narrow and difficult to control;

[0008] (5) Usually each gas combustion flame can only complete the production of one optical fiber device at a time, and the output is low;

[0009] (6) It is difficult for a gas flame to effectively heat a small area or a super large area, and it cannot meet the needs of small-sized or large-sized areas of certain optical fiber devices for melting and tapering

[0010] Electric heating is the improvement direction of flame heating. Patent application number: 200610032235.4; 200510031609.6; 200420035981.5 belongs to the resistance heating method in electric heating. Due to the limitation of materials, the heating element is easy to break during use and has a short life.

During the heating process, the optical fiber is placed in the resistance slot of the heater, and there is a gap above the resistance slot, which cannot make the optical fiber uniformly heated in all directions, and it is difficult to meet the heating requirements of multi-core optical fibers and various microstructure optical fibers

[0011] Another electric heating method is electromagnetic induction heating, patent application number: 2011110298960.7, which overcomes the problem of short service life of the existing resistance heating method, but its heating element is a groove structure, and there is a gap on the top, which also cannot make the optical fiber uniform in all directions. heated

[0012] Chinese patent CN102147499A describes a fiber fusion tapering method using a high-frequency carbon dioxide laser as a heat source. This heating method can provide the continuous heat required for melting the fiber, but this heating method requires precise alignment between the laser and the fiber, and belongs to the Point heating, the temperature field is not uniform, it is difficult to provide a uniform and stable temperature field for various micro-structured optical fibers, and it is also impossible to heat multiple optical fibers at the same time

Images