Method of producing optical wave guide fibers

Details Method of producing optical wave guide fibers Method of producing optical wave guide fibers

H - Electricity

01

P

49/9

H01P 11/00 (2006.01)

Patent

CA 1042666

METHOD OF PRODUCING OPTICAL WAVE GUIDE FIBERS ABSTRACT OF THE DISCLOSURE: Procedures are disclosed for producing both core-clad- ding optical fibers and self-focusing optical fibers from porous germanite and/or silicate glasses obtained after phase separation and removal of the soluble phase. A glass which is separable into at least two phases one of which is soluble, is heated to cause phase separation. The soluble phase is leached out removing un- desired impurities. The pores are collapsed and this glass is used to produce cores and/or cladding layers, or self focusing fibers. Preforms of the porous glass have their interconnected pores stuffed with a dopant. In the production of core-cladding optical fibers, the dopant modifies the index of refraction of the core and/or cladding so that the index of refraction of the core is greater than that of the cladding. The control of this index of refraction can be accomplished by addition of non sili- cate network formers such as GeO2 to the original melt before phase separation. These network formers will stay in the inso- luble phase. In producing self-focusing fibers, the dopant may be non-uniformly deposited in order to produce a radial gradient in the index of refraction, or sodium or potassium ions may be ion exchanged into the glass for a portion of a dopant containing lithium or thallium to produce such an index of refraction gra- dient.

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