Light source-optical fiber coupler
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United States of America Patent
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Aug 17, 2004
Grant Date -
Jun 20, 2002
app pub date -
Oct 24, 2001
filing date -
Oct 26, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A light source-optical fiber coupler using a gradient index rod lens 12 by which a diffused luminous flux emitted from a light source (for example, a semiconductor laser 10) is coupled onto an end surface of an optical fiber (for example, a single-mode optical fiber 14). The gradient index rod lens has a planar end surface facing the light source, and a convex spherical end surface facing the optical fiber. The gradient index rod lens has a light source side numerical aperture NA.sub.2 in a range of from 0.40 to 0.75, an effective lens radius r.sub.0 in a range of from 0.3 to 1.0 mm, and a spherical curvature radius R.sub.1 in a range of from 1.2 to 2.0 mm.
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