Manufacture of optical fiber by the double crucible with 20 nozzles

Yao-Ming Chang

doi:10.1117/12.22975

1 November 1990 Manufacture of optical fiber by the double crucible with 20 nozzles

Yao-Ming Chang

Proceedings Volume 1338, Optoelectronic Devices and Applications; (1990) https://doi.org/10.1117/12.22975
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

The double crucible with 20 nozzles contains two separate concentric crucibles with 20 nozzles on the bottom of each. Upper-side crucible is used to melt core glass and bottom-side crucible to melt cladding glass. There is a space between the two crucibles. Nozzles are welded on the bottom of each crucible. They are formed into 20 couples correspondingly and each couple of nozzles are assembled in the manner of transition fit. In order to get even thickness of cladding the tolerances between each couple of nozzles should be controlled minus 0.025mm along the direction of axis of each nozzle. The bulk glass ( F-13 and N-2 ) is heated in crucibles until it is soft enough to flow through the nozzles and meet together just on the end of nozzles. Then it is drawn directly onto a cylindrical drum of approprite diameter. Considering the fluctuate of the fiber diameter caused by the variation of temperature in crucibles and hight of the melted glass, two premelting chambers were designed. After bulk glass is melted in the premelting chambers, the melted glass flows through a hole into the double crucible. The flow should be stable and even if the diameter of the hole has been chosen correctly.

Citation Download Citation

Yao-Ming Chang "Manufacture of optical fiber by the double crucible with 20 nozzles", Proc. SPIE 1338, Optoelectronic Devices and Applications, (1 November 1990); https://doi.org/10.1117/12.22975

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KEYWORDS

Glasses

Cladding

Optical fibers

Refractive index

Liquids

Optoelectronic devices

Interfaces

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