Integrated acousto-optic filters and switches
CA 2004998 C · Owner: Cheung, Kwok-Wai · Inventors: Cheung, Kwok-Wai; Smith, David Arthur; Heffner, Brian Lee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An acousto-optic converter fabricated on x-cut LiNbO3 and having an optical waveguide extending along the y-direction. AD interdigital transducer is oriented at 5° with respect to the y-direction in order to compensate for the acoustic walk-off on such an orientation. Such an integrated acousto-optic converter allows multiple stages of such converters so as to provide for (1) two-stage zero-frequency shifted converters and filters, (2) lasers using an acousto-optic filter as a tuning element (3) polarization-independent converters in which the modes are divided separately, polarization converted, and recombined according to frequency (4) and wavelength, division multiplexing routing …
Read the whole patent
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 8, 1989 and granted October 12, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 8, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2011.
- 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.