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Disclosed is a method of manufacturing a preform for an asymmetric optical fiber which comprises the steps of (a) fixing plural transparent glass rods involving at least one core-mother rod functioning as the core in said optical fiber in parallel relationship, (b) depositing glass soot around an as

Disclosed is a method of manufacturing a preform for an asymmetric optical fiber which comprises the steps of (a) fixing plural transparent glass rods involving at least one core-mother rod functioning as the core in said optical fiber in parallel relationship, (b) depositing glass soot around an assembly of said plural parallel fixed glass rods, thereby providing a single porous cladding bearing the predetermined shape, and (c) vitrifying the porous cladding by thermal fusion, thereby providing the entirely integral transparent preform. The above method does not involve any process of perforating a drilled-pore which is needed inevitably in conventional method. Therefore, it is possible to obtain a long preform with high dimensional precision, and to fabricate the optical fiber with low transmission loss.

대표청구항 ▼

A method of manufacturing a preform for an asymmetrical optical fiber which comprises the steps of: (a) fixing and assembling a plurality of transparent glass rods in parallel relationship in a pair of jigs, to form a rod assembly, said plurality of glass rods including at least one core-mother rod

A method of manufacturing a preform for an asymmetrical optical fiber which comprises the steps of: (a) fixing and assembling a plurality of transparent glass rods in parallel relationship in a pair of jigs, to form a rod assembly, said plurality of glass rods including at least one core-mother rod functioning as a core in said optical fiber and including stress rods; (b) depositing glass soot around said rod assembly of said plurality of fixed glass rods by rotating said rod assembly and spraying the glass soot on said rod assembly while it is rotated, thereby forming a single porous glass cladding which surrounds all the glass rods and has a predetermined shape; and (c) removing said pair of jigs from said transparent glass rods and vitrifying said porous glass cladding to a single transparent cladding by thermal fusion, thereby forming an entire integral transparent preform which can be drawn into an asymmetrical optical fiber, said transparent cladding having a smaller refractive index than said at least one core-mother rod.