Cylindrical fiber coupling lens with biaspheric surfaces
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United States of America Patent
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Sep 12, 1995
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N/A
app pub date -
Dec 18, 1992
filing date -
Dec 18, 1992
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Abstract
A cylindrical lens for coupling light from a line of emitting facets of laser diodes to a line of entrance faces of respective fiber waveguides. The lens is biaspheric, i.e., it includes two aspheric refractive surfaces which, in planes transverse to the lens axis, have (curvatures that are other than of a conic in cross-section. The surfaces are shaped to correct for spherical aberrations, coma, and other off-axis aberrations. A system places the lens to image the emitting facets of the laser diode line onto the entrance facets of the fiber waveguides so that coupling efficiency between the two is relatively insensitive to lateral misalignment.
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