Optical amplification system
CA 2110191 C · Owner: Saito, Tomoki · Inventors: Saito, Tomoki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an optical amplification system of the present invention, an ASE (amplified spontaneous emission) light included in a signal light band is removed to provide low noise characteristics. The signal light is amplified by an optical amplification unit, and is supplied to an ASE removal unit. In the ASE unit, the signal light is transmitted therethrough and the ASE light is reflected in the orthogonal direction to the light propagation direction. Consequently the optical amplification system having low noise characteristics is obtained.
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 November 29, 1993 and granted November 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2015.
- 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.