Termination interface structure and method for joining an optical fiber to a graded index rod lens
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United States of America Patent
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Oct 16, 1990
Grant Date -
N/A
app pub date -
Jul 10, 1989
filing date -
Jul 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order to make possible the provision of a good fusion joint with low losses between an optical fiber and a graded index (GRIN) glass rod lens with considerably larger diameter, the end of the GRIN lens to which the optical fiber is to be joined is tapered down radially the extent of at least one third the radius of the cylindrical lens at an angle approximately 45.degree.. It is then possible to make a mechanically good fused joint with low transmission losses in the mid portion of the reduced-diameter end of the lens by heating the butt joint with an electric arc. The taper may be frusto-conical, convex or concave.
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