Automatic power shut-down arrangement for optical line systems
CA 2287656 A1 · Owner: Israel, John G. · Inventors: Ng, Chu; Israel, John G.; Czarnocha, William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An arrangement is provided which detects the loss of a high power signal in an optical transmission path and the loss of supervisory signal power and in , response, thereto, automatically invokes a procedure which causes an optical signal source, connected to the fiber to reduce the power level at which it is transmitting optical signals, over the fiber to a safe level. More specifically reduction of optical signal , power, supplied by an upstream network element by a prescribed amount is achieved by automatically controlling the output power level of the upstream network element in, response to the detection of both loss of signal power and loss of supervisory signal, power 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 October 27, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 27, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2021.
- 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.