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Design and analysis of ARROW-based racetrack resonator vibration sensor for inertial navigation application

Malathi, Sathish and Srinivas, Talabatulla (2008) Design and analysis of ARROW-based racetrack resonator vibration sensor for inertial navigation application. In: Conference on Optical Design and Engineering III, SEP 02-05, 2008, Glasgow.

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In this paper we propose and analyze a novel racetrack resonator based vibration sensor for inertial grade application. The resonator is formed with an Anti Resonance Reflecting Optical Waveguide (ARROW) structure which offers the advantage of low loss and single mode propagation. The waveguide is designed to operate at 1310nm and TM mode of propagation since the Photo-elastic co-efficient is larger than TE mode in a SiO2/ Si3N4/ SiO2. The longer side of the resonator is placed over a cantilever beam with a proof mass. A single bus waveguide is coupled to the resonator structure. When the beam vibrates the resonator arm at the foot of the cantilever experiences maximum stress. Due to opto-mechanical coupling the effective refractive index of the resonator changes hence the resonance wavelength shifts. The non uniform cantilever beam has a dimension of 1.75mm X 0.45mm X 0.020mm and the proof mass has a dimension of 3mm X 3mm X 0.380mm. The proof mass lowers the natural frequency of vibration to 410Hz, hence designed for inertial navigation application. The operating band of frequency is from DC to 100Hz and acceleration of less than 1g. The resonator has a Free Spectral Range (FSR) of 893pm and produces a phase change of 22.4mrad/g.

Item Type: Conference Paper
Publisher: The International Society for Optical Engineering
Additional Information: Copyright of this article belongs to The International Society for Optical Engineering.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 11 Mar 2010 07:31
Last Modified: 11 Mar 2010 07:31
URI: http://eprints.iisc.ac.in/id/eprint/26097

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