Method for coupling of semiconductor lasers into optical fibers

Details Method for coupling of semiconductor lasers into optical fibers Method for coupling of semiconductor lasers into optical fibers

1997-01-03

1998-05-12

Ngo, John

Optical waveguides

With optical coupler

Input/output coupler

385 38, 385385, 385 43, 385 36, 385146, 65387, G02B 632

Patent

active

057518718

ABSTRACT:
A method for efficiently coupling beams from semiconductor lasers into optical fibers is presented which provides optical fibers with a modified end surface for efficient coupling. The method comprises a combination of shaping of the fiber end face and of axially varying the refractive index of the fiber end face material as a function of the distance from fiber end face surface. One preferred embodiment employs an axial gradient-index lens (AGRIN lens) fabricated directly on the fiber end face to improve coupling a laser beam into the fiber. The method can also be used in other applications where optical fibers having spherical or more complicated surfaces of their end faces need to be fabricated.

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K. Mathyssek et al. "Fabrication and Investigation of Drawn Fiber Tapers with Spherical Microlenses" J. Opt. Comm 6, 142-146 (1955).
U.C. Paek & A.L. Weaver "Formation of a Spherical Lens at Optical Fiber Ends with a CO.sub.2 Laser" Appl. Opt. 14, 294-298 (1975).
P.K. Manhart, "Macro AGRIN Lenses for Optical Design Applications" Optics & Photonics News 6 44-47 (1995).

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