Optical transmission systems
CA 2423622 A1 · Owner: Nortel Networks Limited · Inventors: Fells, Jullian A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical transmission system comprises a transmitter 1 having an optical source 2, adapted to emit light, a modulator 4 operable to modulate the light to produce a, modulated optical signal and a dispersion element 8 adapted to apply dispersion to the, modulated optical signal. The optical signal being modulated by the application of, predetermined chirp thereto and the modulated optical signal having predetermined, dispersion applied thereto such that the signal is discernible at a point along either a, positive or negative dispersion fibre 16 in a range between a minimum and a , maximum distance relative to the transmitter 1.
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, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 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.