Passive optical telecommunication system
CA 2120116 A1 · Owner: Neidlinger, Stephan · Inventors: Neidlinger, Stephan; Bolze, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a passive optical telecommunication system having a central station communicating via respective optical waveguides with a number of decentralized stations an electrical carrier signal is DPSK-modulated in the upstream transmission after which, the electrical signal modulated in this way effects the intensity modulation of the emitted light; in the downstream signal transmission the emitted light is intensity-modulated by a preferably scrambled NRZ baseband signal. The carrier signal is derived by frequency multiplication from the regenerated reception clock signal of the decentralized station.
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 28, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2016.
- 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.