Fiber loop ring-down cavity integrated U-bent single-mode-fiber for magnetic field sensing

Yaofei Chen; Tiegen Liu; Qun Han; Wenchuan Yan; Lin Yu

doi:10.1364/PRJ.4.000322

Photonics Research, Volume. 4, Issue 6, 322(2016)

Fiber loop ring-down cavity integrated U-bent single-mode-fiber for magnetic field sensing

Yaofei Chen^1,2, Tiegen Liu^1,3,4, Qun Han^1、*, Wenchuan Yan¹, and Lin Yu¹

Author Affiliations

¹College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China

²Department of Mechanical Engineering, Columbia University, New York 10027, USA

³Key Laboratory of Opto-electronics Information Technology (Tianjin University) Ministry of Education, Tianjin 300072, China

⁴e-mail: tgliu@tju.edu.cn

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Figures & Tables(8)

Fig. 1. Schematic diagram of the sensing system.

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Fig. 2. Schematic of the sensing head based on an MF-coated U-bent fiber structure.

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Fig. 3. Schematic diagrams for measuring (a) the gain characteristic of the EDFA module depending on wavelength and (b) the transmission spectrum of the sensing head in the MF under 0 Oe. OPM, optical powermeter; BBS, broadband source (Lightcomm Tecnologia Ltd.); OSA, optical spectrum analyzer (Advantest Q8384).

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Fig. 4. Measured transmittance spectrum of the sensing head and the gain characteristic curve of the EDFA module.

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Fig. 5. (a) Spectral response of the sensing head to the applied magnetic field. (b) The transmittance change at 1575 nm depending on H.

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Fig. 6. Output decay trains and the corresponding exponent fittings of the peaks under H of (a) 0 and (b) 250 Oe.

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Fig. 7. Measured ring-down time depending on H. Inset: the statistics and fitting results.

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Table 1. Values of $G_{nor}$ , $V$ , $N$ , and $Q$ at Different Wavelengths
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Table 1. Values of $G_{nor}$ , $V$ , $N$ , and $Q$ at Different Wavelengths
$λ$ (nm) 1555 1560 1565 1570 1575 1580
$G_{nor}$ 0.90 0.95 0.98 1.00 0.98 0.94
$V$ (dB) 10.41 9.04 7.13 5.87 5.49 5.78
$N$ 1 2 7 $> 35$ $> 35$ 14
$Q$ 0.49 0.59 0.77 0.96 1.00 0.91

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Yaofei Chen, Tiegen Liu, Qun Han, Wenchuan Yan, Lin Yu, "Fiber loop ring-down cavity integrated U-bent single-mode-fiber for magnetic field sensing," Photonics Res. 4, 322 (2016)

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