초록 ▼

Disclosed is an optical fiber capable of preventing an increase in an optical loss from occurring during fabrication and extraction of a single mode fiber preform and enhancement of an optical transmission efficiency, a method of producing the same comprising the steps of forming a first quartz robe

Disclosed is an optical fiber capable of preventing an increase in an optical loss from occurring during fabrication and extraction of a single mode fiber preform and enhancement of an optical transmission efficiency, a method of producing the same comprising the steps of forming a first quartz robe having a first thermal conductivity, said first quartz tube being used as a clad; depositing a core layer and a clad layer inside the first quartz robe to form a preliminary perform by heating of the fist quartz robe; forming a second quartz tube having a second thermal conductivity lower than the first thermal conductivity; and depositing the second quartz tube to said preliminary preform by heating to produce the optical fiber preform. On embodiment, uses N overclad layers having thermal conductivites Kx such that K0>K1>K2 . . . >KN and coefficients of viscosity m0m1m2 . . . mN.

대표청구항 ▼

A method of producing an optical fiber preform, the optical fiber preform being used to form a single-mode optical fiber, said method comprising the steps of: forming a first quartz tube having a first thermal conductivity, said first quartz tube being used as a clad; depositing a core layer and a c

A method of producing an optical fiber preform, the optical fiber preform being used to form a single-mode optical fiber, said method comprising the steps of: forming a first quartz tube having a first thermal conductivity, said first quartz tube being used as a clad; depositing a core layer and a clad layer inside said first quartz tube; forming a preliminary preform by heating said first quartz tube having said core layer and said clad layer deposited therein; forming a second quartz tube having a second thermal conductivity lower than said first thermal conductivity; and over-cladding said second quartz tube over said preliminary preform by heating to produce said optical fiber preform.