In-fiber reflection mode interferometer based on a long-period grating for external refractive-index measurement

Kim, Dae Woong; Zhang, Yan; Cooper, Kristie L.; Wang, Anbo

doi:10.1364/ao.44.005368

Cited by 88 publications

(62 citation statements)

References 17 publications

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“…The silver film was thus formed very rapidly. Finally, the fiber was thoroughly cleaned with de-ionized water [11]. The rate of deposition was controlled by changing the strength of the Tollens' reagent, and as a result the fabrication process was very repeatable.…”

Section: Background and Experimentationmentioning

confidence: 99%

“All-fiber” tunable laser in the 2 μm region, designed for CO₂ detection

et al. 2012

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A stable and tunable thulium-doped "all-fiber" laser offering a narrow linewidth has been created specifically to act as a compact and simple laser source for gaseous CO 2 detection. This has been done through a careful design to match the laser output wavelengths to the CO 2 absorption lines at 1.875 and 1.997 μm, respectively. A sustainable output power of 11 mW over a tuning range of 7 nm has been obtained by using a combination of a high-reflective fiber Bragg grating with a low-reflective broadband mirror, fabricated at the end of the fiber through silver film deposition. The tuning was achieved using the relaxation-compression mechanism of the fiber Bragg grating, which formed an integral part of the laser resonant cavity. A fiber Bragg grating at 1.548 μm was utilized as a wavelength reference to monitor the tuning of the laser output over the 2 μm wavelength range with a simple and inexpensive interrogator, to avoid the use of an expensive optical spectrum analyzer and to facilitate "in-the-field" operation. This "all-fiber" laser resonator has been shown to be superior in terms of laser tuning range, output power, and linewidth compared to that created with a fiber Bragg grating pair, which was limited by the nonuniform strain transfer to both fiber Bragg gratings.

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Section: Background and Experimentationmentioning

confidence: 99%

“All-fiber” tunable laser in the 2 μm region, designed for CO₂ detection

et al. 2012

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“…In some published papers, unmodified LPG sensors have been used for non-selective analysis of very highly concentrated glucose solutions, e.g. 300mg/mL [17,18]. Recently, Akash Deep [19] has proposed an enzyme-modified standard LPG as the selective method for glucose detection.…”

Section: Introductionmentioning

confidence: 99%

Novel glucose sensor based on enzyme-immobilized 81° tilted fiber grating

Luo¹,

Yan²,

Sun³

et al. 2014

Opt. Express

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Abstract:We demonstrate a novel glucose sensor based on an optical fiber grating with an excessively tilted index fringe structure and its surface modified by glucose oxidase (GOD). The aminopropyltriethoxysilane (APTES) was utilized as binding site for the subsequent GOD immobilization. Confocal microscopy and fluorescence microscope were used to provide the assessment of the effectiveness in modifying the fiber surface. The resonance wavelength of the sensor exhibited red-shift after the binding of the APTES and GOD to the fiber surface and also in the glucose detection process. The red-shift of the resonance wavelength showed a good linear response to the glucose concentration with a sensitivity of 0.298nm·(mg/ml) −1 in the very low concentration range of 0.0~3.0mg/ml. Compared to the previously reported glucose sensor based on the GOD-immobilized long period grating (LPG), the 81° tilted fiber grating (81°-TFG) based sensor has shown a lower thermal cross-talk effect, better linearity and higher Q-factor in sensing response. In addition, its sensitivity for glucose concentration can be further improved by increasing the grating length and/or choosing a higher-order cladding mode for detection. Potentially, the proposed techniques based on 81°-TFG can be developed as sensitive, label free and micro-structural sensors for applications in food safety, disease diagnosis, clinical analysis and environmental monitoring.

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“…Two cascaded LPFGs construct an in-fiber Mach-Zehnder interferometer (MZI) [1,2] and one LPFG with a terminal reflector functions as an in-fiber Michelson interferometer (MI) [3,4]. Thus LPFG devices include LPFG, LPFGbased MZI, and MI.…”

Section: Introductionmentioning

confidence: 99%

“…LPFGs are often used for bandrejection filters, gain equalizers, or sensors in optical sensing and communication systems [5][6][7][8]. LPFGbased MZIs and MIs are usually employed for highly sensitive measurements and multi-wavelength filters [1][2][3][4]. Uniform LPFG can be easily fabricated, whereas it has undesirable sidebands that can cause cross talk among channels in wavelength-divisionmultiplexing systems.…”

Section: Introductionmentioning

confidence: 99%

Fast analyses and designs of long-period fiber grating devices with cosine-class apodizations by using Fourier mode coupling theory

Zeng

Wei

2013

Appl. Opt.

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This paper presents an analytical approach to fast analyzing and designing long-period fiber grating (LPFG) devices with cosine-class apodizations by using the Fourier mode coupling (FMC) theory. The LPFG devices include LPFGs, LPFG-based in-fiber Mach-Zehnder and Michelson interferometers, which are apodized with the cosine-class windows of cosine, raised-cosine, Hamming, and Blackman. The analytic models (AMs) of the apodized LPFG devices are derived from the FMC theory, which are compared with the preferred transfer matrix (TM) method to confirm their efficiencies and accuracies. The AM-based analyses are achieved and verified to be accurate and efficient enough. The AM-based analysis efficiency is improved over 1318 times versus the TM-based one. Based on the analytic models, an analytic design algorithm is proposed and then applied to designing these LPFG devices, which has the complexity of ON and is far faster than the existing design methods.

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In-fiber reflection mode interferometer based on a long-period grating for external refractive-index measurement

Cited by 88 publications

References 17 publications

“All-fiber” tunable laser in the 2 μm region, designed for CO₂ detection

“All-fiber” tunable laser in the 2 μm region, designed for CO₂ detection

Novel glucose sensor based on enzyme-immobilized 81° tilted fiber grating

Fast analyses and designs of long-period fiber grating devices with cosine-class apodizations by using Fourier mode coupling theory

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In-fiber reflection mode interferometer based on a long-period grating for external refractive-index measurement

Cited by 88 publications

References 17 publications

“All-fiber” tunable laser in the 2 μm region, designed for CO2 detection

“All-fiber” tunable laser in the 2 μm region, designed for CO2 detection

Novel glucose sensor based on enzyme-immobilized 81° tilted fiber grating

Fast analyses and designs of long-period fiber grating devices with cosine-class apodizations by using Fourier mode coupling theory

Contact Info

Product

Resources

About

“All-fiber” tunable laser in the 2 μm region, designed for CO₂ detection

“All-fiber” tunable laser in the 2 μm region, designed for CO₂ detection