The invention provides a step index optical fiber which presents cladding having an index lower than the index of silica and a core with an index higher than the index of silica. The fiber is obtained by drawing a preform made by chemical vapor deposition using a deposition tube of index lower than the index of silica. Inner cladding of index substantially equal to the index of the deposition tube, and then a core of index higher than the index of the inner cladding are deposited in succession therein. The invention makes it possible to obtain a fiber having a large effective area, reduced attenuation, and suitable for being fabricated at low cost by chemical vapor deposition.

Title
Step index optical fiber with doped cladding and core, a preform, and a method of fabricating such a fiber
Application Number
10/136297
Publication Number
20020168162
Application Date
May 2, 2002
Publication Date
November 14, 2002
Inventor
Christine Labatut
Jean Florent Campion
Pascale Nouchi
Maxime Gorlier
Pierre Sillard
Florent Beaumont
Louis Anne de Montmorillon
Ludovic Fleury
Agent
Sughrue Mion Pllc
DC, US
Assignee
Alcatel
IPC
G02B 06/16
C03B 37/18
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