An implementation of non-contact optical fiber displacement sensor using bidirectional modulation of a Mach-Zehnder electro-optical modulator

Hyeon-Ho Kim; Sang-Jin Choi; Keum-Soo Jeon; Jae-Kyung Pan

doi:10.1117/12.2184397

1 July 2015 An implementation of non-contact optical fiber displacement sensor using bidirectional modulation of a Mach-Zehnder electro-optical modulator

Hyeon-Ho Kim, Sang-Jin Choi, Keum-Soo Jeon, Jae-Kyung Pan

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Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 96550H (2015) https://doi.org/10.1117/12.2184397
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of

Abstract

We propose and demonstrate experimentally a non-contact optical fiber displacement sensor based on bidirectional modulation of a Mach-Zehnder electro-optical modulator (MZ-EOM), which consists mainly of a tunable laser, MZEOM, optical collimator, specular object, and photodetector. The relationship between the free spectral range (FSR) and the displacement variation for the proposed scheme is given. The FSR is determined by the dip frequencies with the transfer function of the bidirectional modulation of an MZ-EOM and depends on the travel time. As a result, the FSRs according to the displacement variation are presented via both simulation and experiments. The experimental results for the several displacements using micro-stage and piezo-stack in the frequency range of 100 MHz to 300 MHz show a good agreement with the theoretical analysis. The measured sensitivities for the proposed scheme by using the FSR and the dip frequency shift show 437 kHz/mm and 1203 kHz/mm, respectively.

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Hyeon-Ho Kim, Sang-Jin Choi, Keum-Soo Jeon, and Jae-Kyung Pan "An implementation of non-contact optical fiber displacement sensor using bidirectional modulation of a Mach-Zehnder electro-optical modulator", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96550H (1 July 2015); https://doi.org/10.1117/12.2184397

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KEYWORDS

Optical fibers

Sensors

Modulation

Electro optics

Electro optical sensors

Electrooptic modulators

Modulators

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