Microlenses for coupling optical fibers to elliptical light beams
CA 2085498 C · Owner: American Telephone And Telegraph Company · Inventors: Presby, Herman Melvin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An asymmetric hyperbolic microlens on the end of a single-mode optical fiber enhances the fiber's coupling to elliptical laser beams. The lenses with, controlled eccentricity ratios, are made by micromachining the end of the fiber with a pulsed CO2 laser as the fiber is directed preferably by computer control, about the focused laser beam. Coupling effiencies of 90 percent (-0.75 dB) have been realized with single transverse mode transverse mode lasers at a wavelength of 0.98 µm having an approximately 3 to 1 beam ellipticity. With multimode lasers at 1,48 µm having similar elliptical beams, the asymmetric lenses demonstrate an almost 2 dB increase in coupling efficiency over symmetric …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 16, 1992 and granted February 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 16, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.