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Sensors 2017, 17(10), 2240; https://doi.org/10.3390/s17102240

Improved Numerical Calculation of the Single-Mode-No-Core-Single-Mode Fiber Structure Using the Fields Far from Cutoff Approximation

1,2,3,†
,
1,2,†
,
1,2
,
1,2
,
3
,
3
and
1,2,*
1
Institute of Laser and Optoelectronics, College of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China
2
Key Laboratory of Optoelectronic Information Science and Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
3
Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems, Tianjin Polytechnic University, Tianjin 300387, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 22 August 2017 / Revised: 24 September 2017 / Accepted: 26 September 2017 / Published: 29 September 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1200 KB, uploaded 29 September 2017]   |  

Abstract

Multimode interferometers based on the single-mode-no-core-single-mode fiber (SNCS) structure have been widely investigated as functional devices and sensors. However, the theoretical support for the sensing mechanism is still imperfect, especially for the cladding refractive index response. In this paper, a modified model of no-core fiber (NCF) based on far from cut-off approximation is proposed to investigate the spectrum characteristic and sensing mechanism of the SNCS structure. Guided-mode propagation analysis (MPA) is used to analyze the self-image effect and spectrum response to the cladding refractive index and temperature. Verified by experiments, the performance of the SNCS structure can be estimated specifically and easily by the proposed method. View Full-Text
Keywords: single-mode-no-core-single-mode fiber; guided-mode propagation analysis; numerical calculation; transmission spectra single-mode-no-core-single-mode fiber; guided-mode propagation analysis; numerical calculation; transmission spectra
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Xu, W.; Shi, J.; Yang, X.; Xu, D.; Rong, F.; Zhao, J.; Yao, J. Improved Numerical Calculation of the Single-Mode-No-Core-Single-Mode Fiber Structure Using the Fields Far from Cutoff Approximation. Sensors 2017, 17, 2240.

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