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Proceedings Paper

Coupled resonator optical waveguide sensors: sensitivity and the role of slow light
Author(s): Matthew A. Terrel; Michel J. F. Digonnet; Shanhui Fan
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Paper Abstract

We compare the sensitivity of two configurations of coupled resonator optical waveguide (CROW) gyroscopes proposed by others to conventional optical gyroscopes. In both cases, we demonstrate that for equal device footprint and loss, neither of these CROW gyroscopes configurations is more sensitive than its conventional counterpart. In all cases, loss ultimately limits the maximum rotation sensitivity. The fact that light travels more slowly (i.e., with a greater group delay) in a CROW than in a fiber therefore has no effect on sensitivity. The only benefit slow light does have is that it reduces the device length requirement, or equivalently it increases the sensitivity per unit length. However, we show that this improvement is quantitatively the same as in an RFOG. These conclusions are not limited to these two CROW configurations or to rotation sensing, but applicable to any measurand that modifies the phase of the signal(s) traveling in the resonators.

Paper Details

Date Published: 27 April 2009
PDF: 8 pages
Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 73160I (27 April 2009); doi: 10.1117/12.833477
Show Author Affiliations
Matthew A. Terrel, Stanford Univ. (United States)
Michel J. F. Digonnet, Stanford Univ. (United States)
Shanhui Fan, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 7316:
Fiber Optic Sensors and Applications VI
Eric Udd; Henry H. Du; Anbo Wang, Editor(s)

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