Musical instrument pickup based on a laser locked to an optical fiber resonator

Year: 2011

Authors: Avino S., Barnes J. A., Gagliardi G., Gu X., Gutstein D., Mester J. R., Nicholaou C., Loock H. P.

Autors Affiliation: CNR Istituto Nazionale di Ottica, Via Campi Flegrei 80078 Pozzuoli (Napoli), Italy;
Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6, Canada;
Department of Electrical and Computer Engineering, Ryerson University, Toronto, ON, M5B 2K3, Canada

Abstract: A low-noise transducer based on a fiber Fabry-Perot (FFP) cavity was used as a pickup for an acoustic guitar. A distributed feedback (DFB) laser was locked to a 25 MHz-wide resonance of the FFP cavity using the Pound-Drever-Hall method. The correction signal was used as the audio output and was preamplified and sampled at up to 96 kHz. The pickup system is largely immune against optical noise sources, exhibits a flat frequency response from the infrasound region to about 25 kHz, and has a distortion-free audio output range of about 50 dB. (C) 2011 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 19 (25)      Pages from: 25057  to: 25065

More Information: HPL, JM, CN, DG and JB thank the Canadian Institute for Photonic Innovations and PARTEQ Innovations for funding this work. JM and JB also thank Queen\’s University and the Natural Sciences and Engineering Research Council (NSERC) of Canada for financial support. SA thanks CNR-INO for supporting his visit at Queen\’s University. XG acknowledges support through an NSERC Discovery Grant. We also thank Steve Adolph (PARTEQ) for his advice on the electronic design, Peter Swanson (Dagmar Guitars) for building the guitar, Paul Langlois (guitar) and Wolfgang Rau (cello) for recording some of the music files as well as Lucas Agosta, and Ron Elbaz for assistance with the experiments.
KeyWords: Acoustic noise; Fabry-Perot interferometers; Frequency response; Locks (fasteners); Optical fibers; Pickups, Acoustic guitar; Distortion-free; Fiber Fabry-Perot; Fiber resonator; Flat frequency response; Infrasound region; Optical noise; Pound-Drever-Hall; Audio acoustics; Glass fiber; Acoustics; Article; Equipment; Equipment design; Instrumentation; Laser; Music; Transducer; Acoustics; Equipment Design; Equipment Failure Analysis; Lasers; Music; Optical Fibers; Transducers
DOI: 10.1364/OE.19.025057

Citations: 21
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