US 5,351,323 A · Optical fiber for coupling to elliptically-shaped source

Abstract

An optical system for coupling a laser radiation source to a circularly symmetric single-mode optical fiber. The laser radiation source produces a beam of light having an elliptical mode field. The input end of a coupling fiber, which has a core that is elliptically-shaped in cross-section, is situated in light receiving relationship with respect to the source. The coupling fiber is oriented with respect to the source such that the mode field of the source is aligned with the coupling fiber core to provide the most efficient coupling of light from the source to the fiber. Means such as an evanescent coupler couples light from the output end of the fiber to the circularly symmetric fiber.

Claims11

Dependent claims

An optical system for efficiently coupling light from a source to a circularly symmetric fiber, said system comprising

a radiation source for generating a beam of light having an elliptical mode field,
an optical fiber having a core that is elliptically-shaped in cross-section, said optical fiber having input and output ends, said input end being situated in light receiving relationship with respect to said source, said fiber being oriented with respect to said source such that the mode field of said source is aligned with said fiber core to provide maximum overlap of the mode field of said elliptical core fiber with the mode field of said source,
a single-mode circularly symmetric fiber, and
means for coupling light from the output end of said elliptical core fiber to said circularly symmetric fiber without coupling through an intermediate fiber.

1 more element

Dependencies are inferred from the claim text.

Optical fiber for coupling to elliptically-shaped source

Life of this patent

Optical fiber for coupling to elliptically-shaped source

Life of this patent

Abstract

Claims11