Optical fiber for single-mode operation

Details Optical fiber for single-mode operation Optical fiber for single-mode operation

Filed on

2005-01-04

Date issued

2005-01-04

Examiner

Font, Frank G. (Department: 2883)

Patent Class

Optical waveguides

SubClass

With optical coupler

SubSubClass

Particular coupling function

Other Related Categories

C385S124000

Type

Reexamination Certificate

Status

active

Patent number

06839484

Description

ABSTRACT:
A single-mode fiber of increased core size consists of a “few-mode” fiber, of core size sufficient for guiding up to three high-order modes in addition to the fundamental mode, by interposing perturbations of such spacing along the fiber, as to selectively couple any such high-order modes to (unguided) cladding modes, thereby rejecting all but the fundamental mode. Unwanted coupling of the fundamental mode, leading to added fiber loss, is minimized by appropriate refractive index profile design.

REFERENCES:
patent: 3966446 (1976-06-01), Miller
patent: 4038062 (1977-07-01), Presby
patent: 4641914 (1987-02-01), Sheem
patent: 6131415 (2000-10-01), Chang
patent: 6205268 (2001-03-01), Chraplyvy

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