Polarimetric Current Sensor Using an In-Line Faraday Rotator

Fabien BRIFFOD  Luc THEVENAZ  Pierre-Alain NICATI  Alain KUNG  Philippe A. ROBERT  

IEICE TRANSACTIONS on Electronics   Vol.E83-C   No.3   pp.331-335
Publication Date: 2000/03/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Sensors)
Category: Sensors for Electromagnetic Phenomena
fiber optic,  current sensor,  Faraday rotator,  polarimetric sensor,  

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A novel polarimetric fiber optics current sensor configuration using an in-line 22.5 degree Faraday rotator is proposed on this paper. The introduction of the 22.5 degree Faraday rotator allows to obtain a sensor configuration that does not require adjustment on most optical elements, resulting in an accuracy immune to manufacturing issues. Two prototypes are presented in this paper that are designed to measure AC current, yielding in an excellent accuracy over more than 3 decades.