L-band amplifier with distributed filtering
CA 2381650 A1 · Owner: Minelly, John D. · Inventors: Minelly, John D.; Yadlowsky, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An L-band optical amplifier has a rare earth doped gain medium including a filter distributed over a finite physical portion of the gain medium. The filter is distributed over between about 25 % to substantially the entire length of the gain medium. The distributed filter substantially eliminates outof-band light emission (C-band ASE, 1520nm-1565nm) and thus improves the performance of L-band amplification (1565nm-1620nm). Examples of distributed filters include discrete type filters such as long period gratings or , continuous type filters such as rare earth doped twin core fibers, non-, adiabatically tapered fibers and coaxial resonant ring fibers.
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 July 10, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 10, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 10, 2022.
- 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.