Frequency-domain displacement sensing with a fiber ring-resonator containing a 
variable gap

Vollmer, Frank; Fischer, Peer

doi:10.1016/j.sna.2006.06.022

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Frequency-domain displacement sensing with a fiber ring-resonator containing a variable gap

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Fischer, Peer
Optical Nanoscopy, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Vollmer, F., & Fischer, P. (2007). Frequency-domain displacement sensing with a fiber ring-resonator containing a variable gap. Sensors and Actuators A-Physical, 134(2), 410-413. doi:10.1016/j.sna.2006.06.022.

Cite as: https://hdl.handle.net/21.11116/0000-000B-00CB-0

Abstract

Ring-resonators are in general not amenable to strain-free (non-contact) displacement measurements. We show that this limitation may be overcome if the ring-resonator, here a fiber-loop, is designed to contain a gap, such that the light traverses a free-space part between two aligned waveguide ends. Displacements are determined with nanometer sensitivity by measuring the associated changes in the resonance frequencies. Miniaturization should increase the sensitivity of the ring-resonator interferometer. Ring geometries that contain an optical circulator can be used to profile reflective samples.