Optical signal modulation device
CA 1290435 C · Owner: Cunningham, David George · Inventors: Daymond-John, Barbara Elizabeth; Beaumont, Alan Roy; Booth, Richard Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical signal modulation device comprises first and second optical waveguides (1,2) fabricated on Z cut lithium niobate. The waveguides (1,2) are connected at one end to an optical signal splitter (7) and at the other end to a Y coupler (11). The output of the Y coupler (11) is connected to a single mode optical fibre (13). A first pair of modulator electrodes (3,4) are positioned across the waveguides (1,2) to cause relative phase shifts between signals in the two optical waveguides (1,2) in response to a first control signal V1. These relative phase shifts are caused in both TM mode and TE mode signals. The device also includes a second pair of bias electrodes (14, 15) arranged to …
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
- Granted October 8, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 8, 2008.
- 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.