Method for coupling of semiconductor lasers into optical fibers
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United States of America Patent
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May 12, 1998
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N/A
app pub date -
Jan 3, 1997
filing date -
Jan 5, 1996
priority date (Note) -
Expired
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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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