Variable-gain and constant passband optical amplifier and system for automatic compensation for loss variations in an optical link comprising such an amplifier
CA 2222268 A1 · Owner: Alcatel Alsthom Compagnie Generale D'Electricite · Inventors: Bayart, Dominique
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Its gain is regulated by a gain-control signal (G) capable of taking m discrete values. According to one manufacturing mode it comprises: m amplifiers (G¿1?,... G¿m?) each having a gain that is fixed and different from the gains of the other amplifiers and a passband identical to that of the others; an optical switch (SW1) having an input (E) coupled with the input (EA) of the variable-gain amplifier (AVG1) m outputs (S¿1?,... S¿m?) coupled respectively with the inputs of the m fixed-gain amplifiers (G¿1?,... G¿m?) and a control input that receives the gain-control signal (G); and an optical switch (SW2) having m inputs (E¿1?,... E¿m?) coupled respectively with the outputs of the fixed-gain …
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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 April 14, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 14, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 2019.
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