24 February 2016 Integrated compact optical current sensors with high sensitivity
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Proceedings Volume 9744, Optical Components and Materials XIII; 97440D (2016) https://doi.org/10.1117/12.2214499
Event: SPIE OPTO, 2016, San Francisco, California, United States
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.
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Duanni Huang, Duanni Huang, Paolo Pintus, Paolo Pintus, Sudharsanan Srinivasan, Sudharsanan Srinivasan, John E. Bowers, John E. Bowers, "Integrated compact optical current sensors with high sensitivity", Proc. SPIE 9744, Optical Components and Materials XIII, 97440D (24 February 2016); doi: 10.1117/12.2214499; https://doi.org/10.1117/12.2214499
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