Coupling of optical devices to optical fibers by m

专利名称：Coupling of optical devices to optical fibers

by means of microlenses

发明人：Edwards, Christopher A.,Presby, Herman M.申请号：EP90312594.6申请日：19901120公开号：EP0430532A3公开日：19920318

摘要：This invention is concerned with coupling optical energy efficiently by means ofa microlens at an end of an optical fiber, the microlens being capable of improvedcoupling efficiency exceeding 55 percent (-2.5dB), with coupling efficiencies of about 90percent or more (less than 0.45dB and as low as 0.22dB loss) for uncoated lenses and of95 percent or more for antireflection coated lenses being obtainable. An optimal

microlens shape is substantially a hyperboloid of revolution having a relatively short focallength, f, e.g., for a mode radius of the optical device ω₀=1µm and a mode radius of theoptical fiber ω₁=5µm, f≃12µm. The microlens having the substantially hyperboloid ofrevolution shape may be produced by laser micromachining technique. The optical fiberwith the novel microlens at its end may be used in optical communication packagescomprising the fiber and an optical device. The latter may be selected from

semiconductor lasers and amplifiers, fiber amplifiers, pump sources for fiber amplifiers,and may include light receiving devices such as photodetectors.

申请人：AT&T Corp.

地址：32 Avenue of the Americas New York, NY 10013-2412 US

国籍：US

代理机构：Johnston, Kenneth Graham

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