Method of measuring polarization and birefringence in single mode optical fibres
CA 1313055 C · Owner: Coppa, Gianni · Inventors: Coppa, Gianni; Calvani, Riccardo; Cisternino, Francesco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method of measuring the local polarization state within a fibre, or measuring the beat length characterizing the birefringence of an optical fibre a, constant force is applied to the fibre perpendicular to, its axis, to cause a coupling of energy from the fundamental radiation propagation mode of the fibre into a secondary mode which is radiated. The intensity of the scattered radiation associated with the secondary mode is then measured. This intensity is a function of the local state of polarization of radiation in the fibre. By displacing the point at which the force is applied stepwise along the axis of the fibre and by measuring at each point the intensity of the scattered …
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 January 26, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 26, 2010.
- 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.