Integrated optical beam spread transformer
CA 2250505 A1 · Owner: Weinert, Carl Michael · Inventors: Weinert, Carl Michael; Heidrich, Helmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Beam spread transformers are required for chip-fibre couplings and must be polarisation-independent, show low losses and be economically produced. In a beam spread transformer (1) with an integrated structure having several buffer layers (5) mutually separated by conductive layers (6) an uncladded rib , waveguide (7, 8) with a tapering area (9) is arranged on the top buffer layer (5). A section (11) over which the rib (8) extends is located between the interface (2) with the fibre and the tapering area (9). The waveguide layer (7) is completely removed from this section and the exposed buffer layer (5) is reduced to a width w2 which exceeds the width w1 of the continuous rib (8) in …
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 March 27, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2019.
- 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.