Method of making optical fiber having depressed index core...

Details Method of making optical fiber having depressed index core... Method of making optical fiber having depressed index core...

C - Chemistry, Metallurgy

03

B

C03B 37/018 (2006.01) C03B 37/012 (2006.01) C03B 37/014 (2006.01) G02B 6/036 (2006.01) G02B 6/18 (1995.01)

Patent

CA 2161939

Disclosed is a method of making an optical fiber preform having at least one annular region of depressed refractive index. A tube of silica doped with fluorine and/or boron is overclad with silica soot. A core rod is inserted into the overclad tube and the resultant assembly is heated while chlorine flows between the tube and the core rod to clean the adjacent surfaces. When the soot consolidates, the tube collapses onto and fuses to the rod. The resultant tubular structure is provided with cladding and drawn to form an optical fiber which exhibits low attenuation as a result of the low seed count at the interface between the inner core and the region that is doped with florine and/or boron.

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