Method of producing optical fiber preforms

• US 20040109942A1
• Filed: 11/25/2003
• Published: 06/10/2004
• Est. Priority Date: 12/05/2002
• Status: Abandoned Application

• Current Assignee: Draka Comteq BV (Prysmian SPA)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Offre, Nathalie, Glemot, Marie-Pierre, Jolly, Jacques, Campion, Jean-Florent, Decaux, Isabelle
• Application Number:
  US10/720,670
• Publication Number:
  US 20040109942A1
• Time in Patent Office: Days
• US Class Current: 427/163.2
• CPC Class Codes: C03B 2201/28 doped with phosphorus
• CPC Class Codes: C03B 2203/23 Double or multiple optical cladding profiles
• CPC Class Codes: C03B 2203/36 Dispersion modified fibres, e.g. wavelength or polarisation shifted, flattened or compensating fibres (DSF, DFF, DCF)
• CPC Class Codes: C03B 37/01807 Reactant delivery systems, e.g. reactant deposition burners
• CPC Class Codes: Y02P 40/57 Improving the yield, e-g- reduction of reject rates

Abstract

In an FCVD process for producing preforms for dispersion shifted optical fiber or dispersion compensating optical fiber having a core comprising a central portion, an inner cladding, a ring, and an outer cladding by depositing layers, the layers of the preform corresponding to the inner cladding and to the ring of the optical fiber have a phosphorus content not greater than 0.1 wt %.

Claims

1. A CVD process for producing preforms for dispersion shifted optical fiber or dispersion compensating optical fiber having a core comprising a central portion, an inner cladding, a ring, and an outer cladding, by depositing layers, in which process the layers of said preform corresponding to said inner cladding and to said ring of said optical fiber have a phosphorus content not greater than 0.1 wt %.

3. The optical fiber preform production process claimed in claim 1 wherein said layers of said preform corresponding to said outer cladding of said optical fiber have a phosphorus content in the same range of values as said layers of said preform corresponding to said inner cladding and to said ring of said optical fiber.

4. The optical fiber preform production process claimed in claim 1 wherein said layers are deposited at a pressure within 20% of atmospheric pressure.

5. The optical fiber preform production process claimed in claim 1, when said optical fiber is intended to be integrated into a submarine cable.

2. The optical fiber preform production process claimed in 1 wherein said layers of said preform corresponding to said inner cladding and to said ring of said optical fiber have a phosphorus content from 0.03 wt % to 0.1 wt %.