Optical amplifier
CA 2074813 A1 · Owner: Alcatel N.V. · Inventors: Heidemann, Rolf; Pfeiffer, Thomas; Kaiser, Manfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Known optical amplifiers which are used in a light transmis-, sion path to amplify the light signals to be transmitted have, the disadvantage that the semiconductor lasers used as pump, lasers therein, are very sensitive to feedback. According to the invention the operating current of such pump, lasers (4) is modulated at a high frequency which causes the, pump laser to operate in a multi-mode thereby making it in-, sensitive to feedback. For example the operating current is, DC, on which AC is superimposed. In the event the optical amplifier has two pump lasers their, operating current is also modulated. Both pump lasers are then advantageously alternately switched on and off at a …
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 December 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2013.
- 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.