Investigation on a compact in-line multimode-single-mode-multimode fiber structure

Yin, Bin; Li, Yang; Liu, Zhibo; Shen, Feng; Bai, Ya; Xu, Yao; Jian, Shuisheng

doi:10.1016/j.optlastec.2015.12.018

Cited by 51 publications

(20 citation statements)

References 20 publications

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“…The transmission losses of the first dip in Figures (a) and (b) are −22.3 dB ( R = 99.4%) and −21.1 dB ( R = 99.2%), respectively, the estimated laser induced refractive index modulation Δ n m are 6.4 × 10 −4 and 6.1 × 10 −4 according to the expression for maximum reflectivity R = tan h 2 ( κL ), where the coupling coefficient κ =π m Δ n m /(2 n eff Λ m ), and L is grating length. We can also see that the interference effect induced by the SMS structure is not obvious, it's perhaps the low reflection at the interfaces of SMF and MMF compared with MFBG.…”

Section: Resultsmentioning

confidence: 96%

Investigation of the fiber Bragg grating inscribed in multimode fiber by femtosecond laser

Jiang

Yang

Yuan

et al. 2016

Micro & Optical Tech Letters

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Multimode fiber Bragg grating (MFBG) is inscribed in graded‐index multimode fiber using infrared femtosecond laser and phase mask. Multiple dips are observed in the transmission spectrum of MFBG. There is not only self‐coupling effect between the forward and backward principal modes, but also the mutual coupling effect between the neighbor modes. The induced refractive index modulation of 6.4 × 10 −4 is achieved for a peak power density of 4.1 × 1013 W/cm2 without any fiber sensitization. Thermal experiment results show that the MFBG belongs to type I grating. The transmission spectrum of MFBG shifts linearly with the strain and pressure at sensitivities of 1.27 ± 0.002 pm/με and −3.3 ± 0.06 pm/MPa, respectively. The MFBGs are expected to be used for multichannel filters, multiwavelength fiber lasers, and multiparameter sensing. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:214–219, 2017

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Section: Resultsmentioning

confidence: 96%

Investigation of the fiber Bragg grating inscribed in multimode fiber by femtosecond laser

Jiang

Yang

Yuan

et al. 2016

Micro & Optical Tech Letters

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“…Generally, each optical path difference induced by the combination of these modes could generate either interference weak or strong interference (depending on the intensity of the involved modes). Here, we only consider the dominant interference caused by the optical path difference (OPD) induced by the central core mode and the surrounding core mode of the MCF [16], so this structure still can be regarded as an MZI model [17], then the transmission spectrum intensity of the proposed interferometer can be explained as…”

Section: Sensing Principlementioning

confidence: 99%

“…Compared with the early MZI structure [17][18][19], the proposed sensor in this paper has a shorter structure and deeper interference valley. In terms of the manufacturing process of different MZI structures, the proposed SMF-ball-SCF-ball-SMF sensor structure has a simpler manufacturing process and the length of the MZI is more controllable.…”

Section: Microdisplacement Experimentsmentioning

confidence: 99%

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Application of MZI Symmetrical Structure With Fiber Balls and Seven-Core Fiber in Microdisplacement Measurement

Zhao

Song

et al. 2018

Photonic Sens

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An optical fiber microdisplacement sensor based on symmetric Mach-Zehnder interferometer (MZI) with a seven-core fiber and two single-mode fiber balls is proposed. The rationality and manufacturing process of the MZI sensing structure are analyzed. The fabrication mechanism of the Mach-Zehnder sensor by CO2 laser is described in detail. Experimental results show that temperature sensitivities of the two dips are 98.65 pm/ and 89.72pm/ ℃ ℃ , respectively. The microdisplacement sensitivities are 2017.71 pm/mm and 2457.92 pm/mm, respectively. The simultaneous measurement of temperature and microdisplacement is demonstrated based on the sensitive matrix. The proposed Mach-Zehnder interference sensor exhibits the advantages of compact structure, simple manufacturing process, and high reliability.

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“…Different types of optical fibre sensor structures have been developed including fibre Bragg gratings (FBG) [1,2], long period gratings (LPG) [3], special fibres such as D-shaped fibres and photonic crystal fibres [4,5], multimode fibres (MMF) [6,8], and multi-core fibres [9]. Grating-based temperature sensors are the most popular sensor type but they provide sensitivity in the range of only a few tenths of pm/ o C [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

High sensitivity temperature sensor based on a polymer filled hollow core optical fibre interferometer

Kumar

et al. 2017

SPIE Proceedings

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) High sensitivity temperature sensor based on a polymer filled hollow core optical fibre interferometer ABSTRACTA high-sensitivity temperature sensor based on a singlemode-multimode-polymer filled hollow core fibre-multimodesinglemode (SMHMS) fibre structure is proposed. This sensor was made from a short section of hollow core fibre filled with a high thermo-optic coefficient (TOC) polymer with a refractive index close to that of the fibre cladding, fusion spliced between two singlemode-multimode (SM) fibre structures. This sensor effectively improves the temperature sensitivity by over 200 times by comparison to a conventional singlemode-multimode-singlemode (SMS) fibre structure. In this report, we experimentally demonstrate that the proposed sensor provides a high temperature sensitivity of 2.16 nm/C.

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Investigation on a compact in-line multimode-single-mode-multimode fiber structure

Cited by 51 publications

References 20 publications

Investigation of the fiber Bragg grating inscribed in multimode fiber by femtosecond laser

Investigation of the fiber Bragg grating inscribed in multimode fiber by femtosecond laser

Application of MZI Symmetrical Structure With Fiber Balls and Seven-Core Fiber in Microdisplacement Measurement

High sensitivity temperature sensor based on a polymer filled hollow core optical fibre interferometer

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