Tunable, mechanically induced long-period fiber grating with enhanced polarizing characteristics
CA 2292974 A1 · Owner: Shaw, H. John · Inventors: Shaw, H. John; Kino, Gordon S.; Savin, Silviu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A new type of fiber filter is useable in optical communication systems. In particular, the fiber filter may be used to flatten the gain of erbium-doped fiber, amplifiers (EDFAs). Such gain flattening is important for long-haul dense, (wavelength dependent multiplexed) WDM communication systems. The filter includes a periodic mechanical structure pressed against the side of a singlemode, fiber to induce a wavelength-dependent loss in a signal propagating in the fiber core, by coupling the signal to fiber cladding modes. The mechanical structure is a periodic, comb of small ridges. Each ridge induces a local index change in the fiber via the, photoelastic effect. For coupling to the right …
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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 December 21, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.