Single mode optical fibers and modular method of making same

US8472770B2 · kind B2 · utility

Assignee

• OFS Fitel, LLC · US

Inventors

• John Fini · Metuchen, US
• Robert Lingle, Jr. · Norcross, US
• Yi Sun · San Jose, US

Key dates

• Filing date: Sep 28, 2010
• Grant date: Jun 25, 2013
• Expiry date: Jun 8, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/14
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Optical fiber comprises core and a cladding configured to support and guide a fundamental transverse mode, the cladding including (i) an outer cladding having an index nout less than the index n1 of the core, (ii) an inner cladding having an index n2<nout, (iii) a pedestal having an index n4˜nout, (iv) an inner trench disposed between the inner cladding and the pedestal, the inner trench having an index n3<<n4, and (iv) an outer trench disposed between the pedestal and the outer cladding, the outer trench having an index n5<n4 and relatively close to nout. To suppress unwanted HOMs the pedestal is configured to resonantly couple at least one unwanted transverse mode of the core (other than the fundamental mode) to at least one transverse mode of the pedestal. Also described is a modular method of making the optical fiber of silica glass.