Apparatus and method providing a balancing load to a laser differential drive circuit
CA 2441090 A1 · Owner: Finisar Corporation · Inventors: Tatum, Jim; Guenter, James K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A die having a semiconductor laser driven by a differential drive circuit is provided. The die provides a matched load to the drive circuit by also having a balancing load with an impedance, including both resistive and reactive components, substantially identical to the load impedance of the semiconductor laser fabricated on the die. With the balancing load and semiconductor laser pair, the die prevents impedance-mismatch-induced drive problems that occur in high frequency operation, e.g. above about 1 GHz. The semiconductor laser may be a vertical cavity surface emitting laser (VCSEL) for example, as are used , in high bandwidth applications like Gigabit Ethernet and Fibre Channel …
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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 March 12, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 12, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2024.
- 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.