Optical fiber with an integral lens at its end portion
Johnson, Bertrand H
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Citation (published version)Greg Blonder, Bertrand H Johnson. "Optical fiber with an integral lens at its end portion." U.S. Patent 5,101,457-A.
An optoelectronic assembly is described which comprises an optoelectronic device (e.g. laser, photodiode or another fiber), an end portion of an optical fiber coupled to the device, and an integral lens formed on the end portion. The lens comprises a frustum of a first cone having a cone angle θ1, and, on top of the frustum, a second cone having a cone angle θ2 <θ1, thus forming a double conical lens which requires no further operations (such as fire polishing) to provide coupling efficiencies of about 80% with a standard deviation of less than ±2%.