The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 2026
Filed:
Sep. 02, 2022
Smart Digital Optics Pty Ltd, Eveleigh, AU;
Matar Mamdouh, Eveleigh, AU;
Andrew Mark Michie, Eveleigh, AU;
John Ingram, Eveleigh, AU;
Jose Miguel Lazaro Urrutia, Eveleigh, AU;
Andoni Gallastegi Uriarte, Eveleigh, AU;
SMART DIGITAL OPTICS PTY LTD, Eveleigh, AU;
Abstract
Passive optical Sagnac interferometers for current sensing, method of using the same and method of constructing the same. In one embodiment, the passive optical Sagnac interferometer for current sensing comprises an N×N fibre coupler, wherein N>=3; and a fibre coil disposed on a first side of the N×N fibre coupler, a first port of the N×N fibre coupler coupled to a first end of the fibre coil via a first linear polariser and a second port of the N×N fibre coupler coupled to a second end of the fibre coil via a second linear polariser; wherein the fibre coil is configured to support only one elliptical polarisation state in counter-propagating light signals in the fibre coil.