Optical duobinary single sideband modulator
CA 2415910 A1 · Owner: Telecommunications Research Laboratories · Inventors: Davies, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for modulating information bearing symbols onto an optical carrier includes, a polybinary coder that operates on a binary information signal to produce an envelope, compatible polybinary signal; and an optical single sideband modulator that modulates an, optical carrier with the envelope compatible polybinary signal to produce a single, sideband optical signal. This provides an improvement over both polybinary signaling, and optical single sideband. This action combines the chromatic dispersion advantages of, SSB modulation with the DC level and bandwidth reduction of duo-binary coding.
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 January 8, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 8, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 2025.
- 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.