Generation of radio frequency modulated optical radiation
CA 2185132 C · Owner: Nesset, Derek · Inventors: Wake, David; Nesset, Derek; Moodie, David Graham
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the generation of radio frequency modulated optical radiation in particular for use in a radio over fibre communications system. It has been found that a semiconductor electroabsorption modulator can efficiently modulate an input optical signal at harmonics of the electrical modulation frequency applied to the electroabsorption modulator. A low frequency design and thus low cost, electroabsorption modulator can be utilised to generate higher order harmonics of an electrical drive signal for use in a radio over fibre communications system.
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 March 17, 1995 and granted September 26, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 17, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2017.
- 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.