Thinned Fiber Bragg Gratings as High Sensitivity Refractive Index Sensor

Iadicicco, Agostino; Cusano, A.; Cutolo, A.; Bernini, Romeo; Giordano, M.

doi:10.1109/lpt.2004.824972

Cited by 309 publications

(155 citation statements)

References 10 publications

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“…However, if fiber cladding diameter is reduced along the grating region to a certain extent, the n eff is significantly affected by external refractive index [45]. FBG refractive index sensors are based on the interactions between the evanescent field of the fundamental core mode and the surrounding materials.…”

Section: Optical Fiber Magnetic Filed Sensor Developmentmentioning

confidence: 99%

Review on optical fiber sensors with sensitive thin films

Yang

Dai

2011

Photonic Sens

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Abstract:The combination of fiber optics with nano-structure technologies and sensitive thin films offers great potential for the realization of novel sensor concepts. Miniatured optical fiber sensors with thin films as sensitive elements could open new fields for optical fiber sensor applications. Thin films work as sensitive elements and transducer to get response and feedback from environments, in which optical fibers are employed to work as signal carrier. This article presents some research work conducted at the National Engineering Laboratory for Optical Fiber Sensing Technologies in recent years. Concrete examples are: Pd/WO 3 co-sputtered coating as sensing material for optical hydrogen sensors shows robust mechanical stability and meanwhile good sensing performance; TbDyFe magnetostrictive coating directly deposited on fiber Bragg grating (FBG) demonstrates its possibility of miniature optical magnetic field/current sensors, and 40-pm shift of the FBG wavelength happens at a magnetic field order of 50 mT.

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Section: Optical Fiber Magnetic Filed Sensor Developmentmentioning

confidence: 99%

Review on optical fiber sensors with sensitive thin films

Yang

Dai

2011

Photonic Sens

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“…The behavior of the effective refractive index of the fundamental core mode as a function of the SRI in a cladding-etched single-mode FBG has been investigated by Iadicicco and Cusano [21]. They selected a SMF-28 fiber with a core diameter of 8.3 μm, an original cladding diameter of 125 μm, a core refractive index of 1.460, a refractive index difference of 0.36% for numerical analysis and experiment, and an effective refractive index n eff of the fundamental core mode of 1.4588 at an operating wavelength of 1550 nm.…”

Section: Characteristics Of the Fundamental Core Mode In The Claddingmentioning

confidence: 99%

“…A higher relative sensitivity ( λ B /λ B ) ( n out /n out ) was observed as well, since the fundamental core mode was less confined in the core region, leading to an increased interaction with the surrounding medium. The theoretical calculation for SRI sensitivity is shown in Table 1 [21], and the experimental curve of wavelength shift versus SRI in a SMF FBG with core diameter of 8.5 μm is shown in Fig. 2 [21].…”

Section: Characteristics Of the Fundamental Core Mode In The Claddingmentioning

confidence: 99%

Recent developments in microstructured fiber Bragg grating refractive index sensors

et al. 2010

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Abstract. Refractive index measurement by optical fiber sensors has proved to be effective in the research of biochemical and biomedical applications. The theoretical principles and technology underlying several microstructured fiber Bragg grating refractive index sensors developed over the past decade are classified and briefly summarized, and their future developments are considered. C 2010 Society of Photo-Optical Instrumentation Engineers.

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“…Single-mode fiber refractive index sensor with large lateral offset fusion splicing between two abrupt tapers 1 Introduction Optical fiber sensors have attracted great attention in refractive index (RI) sensing applications due to their compactness and high sensitivity. There are many methods for constructing in-fiber RI sensors, including fiber Bragg grating (FBG), 1 long-period grating (LPG), 2 photonic crystal fiber (PCF), 3 and single mode-multimode-single mode fiber structure.…”

mentioning

confidence: 99%

“…There are many methods for constructing in-fiber RI sensors, including fiber Bragg grating (FBG), 1 long-period grating (LPG), 2 photonic crystal fiber (PCF), 3 and single mode-multimode-single mode fiber structure. 4 Recently, many kinds of Mach-Zehnder interferometer (MZI) structures have been applied to the design and fabrication of in-fiber RI sensors, such as the two-taper MZI, 5 core-offset attenuators, 6 LPG pairs, 7,8 an improved sandwiched-taper MZI, 9 and PCF-based MZI structure.…”

mentioning

confidence: 99%

Single-mode fiber refractive index sensor with large lateral offset fusion splicing between two abrupt tapers

et al. 2012

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Abstract. We propose a novel refractive index (RI) sensor based on a fiber Mach-Zehnder interferometer formed by large lateral offset fusion splicing between two abrupt tapers. The cladding modes are efficiently excited by transmitted light in the large misalignment junctions. The RI sensitivity of the sensor to surrounding RI change is measured, and the sensitivity of 100 nm∕RIU is obtained, which is three to six times higher than that of fiber structures with only a pair of tapers or two offset junctions. Moreover, the sensor is made by a lowcost fabrication method. Thus, the proposed structure is beneficial to the RI sensing applications.

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Thinned Fiber Bragg Gratings as High Sensitivity Refractive Index Sensor

Cited by 309 publications

References 10 publications

Review on optical fiber sensors with sensitive thin films

Review on optical fiber sensors with sensitive thin films

Recent developments in microstructured fiber Bragg grating refractive index sensors

Single-mode fiber refractive index sensor with large lateral offset fusion splicing between two abrupt tapers

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