Method and arrangement for optical switching
CA 2096965 C · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Johansson, Sonny
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an optical switch by means of which wavelength multiplexed optical signals (.lambda. i-.lambda. n) can be switched in an optically uninterrupted fashion through the switch. The switch is transparent to the bit rate and code format of the optical signals and comprises groups of a number (n) of tunable optical wavelength filters (39A1- 39An...39n1-39nN), preferably tunable laser amplifiers. Control means control the setting of the tunable wavelength filters as well as the settings of optical switching elements (45A-45N) so as to prevent two identical wavelengths from appearing simultaneously at the input and output links.
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 20, 1991 and granted February 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 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.