Method for configuring air-core photonic-bandgap fibers free of surface modes
CA 2538750 C · Owner: Digonnet, Michel J. F. · Inventors: Shin, Jonghwa; Digonnet, Michel J. F.; Fan, Shanhui
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Coupling of core modes to surface modes in an air core photonic-bandgap fiber (PBF) can cause large propagation losses. Computer simulations analyze the relationship between the geometry and the presence of surface modes in PBFs having a triangular hole pattern and identify ranges of core characteristic dimensions (e.g. radii) for which the fiber supports no surface modes (i.e. only core modes are present) over the entire wavelength range of the bandgap. In particular, for a hole spacing and a hole radius = 0.47 the core , supports a single mode and supports no surface modes for core radii between about 0.7 and about 1.05 , which suggests that such fibers should exhibit a …
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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 September 10, 2004 and granted March 27, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 10, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 2026.
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