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Open AccessArticle

An Analytical Model for Describing the Power Coupling Ratio between Multimode Fibers with Transverse Displacement and Angular Misalignment in an Optical Fiber Bend Sensor

1
Optical Fibre Sensors Research Centre (OFSRC), Dept. of Electronic and Computer Engineering, University of Limerick, V94 T9PX Limerick, Ireland
2
Center of Research in Optoelectronics, Communication and Computational Systems (BU-CROCCS), School of Engineering, Bangkok University, Pathumthani 12120, Thailand
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(22), 4968; https://doi.org/10.3390/s19224968
Received: 19 September 2019 / Revised: 27 October 2019 / Accepted: 8 November 2019 / Published: 14 November 2019
(This article belongs to the Special Issue Optical Fiber Sensors for Biomedical Applications)
The power coupling ratio between step-index multimode fibers caused by combined transversal and angular misalignment is calculated. A theoretical description of the coupling efficiency between two optical fibers based on geometrical optics is provided. The theoretical calculations are collaborated by experiments, determining the power coupling ratio between three output fibers with an axial offset and angular misalignment with a single input fiber. The calculation results are in good agreement with experimental results obtained using a previously fabricated optical fiber sensor for monitoring physiological parameters in clinical environments. The theoretical results are particularly beneficial for optimizing the design of optical fiber bending sensors that are based on power coupling loss (intensity) as the measurement interrogation requires either axial displacement, angular misalignment, or both. View Full-Text
Keywords: optical coupling efficiency; axial displacement; angular misalignment; fiber optic sensor; geometrical optics optical coupling efficiency; axial displacement; angular misalignment; fiber optic sensor; geometrical optics
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MDPI and ACS Style

Kam, W.; Ong, Y.S.; O’Keeffe, S.; Mohammed, W.S.; Lewis, E. An Analytical Model for Describing the Power Coupling Ratio between Multimode Fibers with Transverse Displacement and Angular Misalignment in an Optical Fiber Bend Sensor. Sensors 2019, 19, 4968.

AMA Style

Kam W, Ong YS, O’Keeffe S, Mohammed WS, Lewis E. An Analytical Model for Describing the Power Coupling Ratio between Multimode Fibers with Transverse Displacement and Angular Misalignment in an Optical Fiber Bend Sensor. Sensors. 2019; 19(22):4968.

Chicago/Turabian Style

Kam, Wern; Ong, Yong S.; O’Keeffe, Sinead; Mohammed, Waleed S.; Lewis, Elfed. 2019. "An Analytical Model for Describing the Power Coupling Ratio between Multimode Fibers with Transverse Displacement and Angular Misalignment in an Optical Fiber Bend Sensor" Sensors 19, no. 22: 4968.

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