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Proceedings Paper

Integrated compact optical current sensors with high sensitivity
Author(s): Duanni Huang; Paolo Pintus; Sudharsanan Srinivasan; John E. Bowers
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Paper Abstract

We demonstrate a Sagnac based fiber optic current sensor using only 10cm of terbium doped fiber with a high Verdet constant of 15.5 rad/Tm at a wavelength of 1300nm. Measurements of the fiber inside a solenoid show over 40dB of open loop dynamic range as well as a minimum detectable current of 0.1mA. In order to decrease size while increasing sensitivity even further, we consider integrated magneto-optic waveguides as the sensing element. Using silicon waveguides alongside magneto-optic material such as cerium doped yttrium iron garnet (Ce:YiG), we model the Verdet constant to be as high as 10,000 rad/Tm. This improvement by three orders of magnitude shows potential for magnetooptic waveguides to be used in ultra-high sensitivity optical magnetometers and current sensors. Finally, we propose a fully integrated optical current sensor using heterogeneous integration for silicon photonics.

Paper Details

Date Published: 24 February 2016
PDF: 8 pages
Proc. SPIE 9744, Optical Components and Materials XIII, 97440D (24 February 2016); doi: 10.1117/12.2214499
Show Author Affiliations
Duanni Huang, Univ. of California, Santa Barbara (United States)
Paolo Pintus, Univ. of California, Santa Barbara (United States)
Scuola Superiore Sant'Anna (Italy)
Sudharsanan Srinivasan, Univ. of California, Santa Barbara (United States)
John E. Bowers, Univ. of California, Santa Barbara (United States)

Published in SPIE Proceedings Vol. 9744:
Optical Components and Materials XIII
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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