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Jacques Albert - One of the best experts on this subject based on the ideXlab platform.

  • absolute near infrared refractometry with a calibrated tilted fiber bragg grating
    Optics Letters, 2015
    Co-Authors: Wenjun Zhou, David J Mandia, Sean T Barry, Jacques Albert
    Abstract:

    The absolute refractive indices (RIs) of water and other liquids are determined with an uncertainty of ±0.001 at near-infrared wavelengths by using the tilted fiber Bragg grating (TFBG) Cladding Mode resonances of a standard single-Mode fiber to measure the critical angle for total internal reflection at the interface between the fiber and its surroundings. The necessary condition to obtain absolute RIs (instead of measuring RI changes) is a thorough characterization of the dispersion of the core Mode effective index of the TFBG across the full range of its Cladding Mode resonance spectrum. This technique is shown to be competitive with the best available measurements of the RIs of water and NaCl solutions at wavelengths in the vicinity of 1550 nm.

  • polarization dependent properties of the Cladding Modes of a single Mode fiber covered with gold nanoparticles
    Optics Express, 2013
    Co-Authors: Wenjun Zhou, David J Mandia, Sean T Barry, Matthew B E Griffiths, Aliaksandr Bialiayeu, Yang Zhang, Peter G Gordon, Jacques Albert
    Abstract:

    The properties of the high order Cladding Modes of standard optical fibers are measured in real-time during the deposition of gold nanoparticle layers by chemical vapor deposition (CVD). Using a tilted fiber Bragg grating (TFBG), the resonance wavelength and peak-to-peak amplitude of a radially polarized Cladding Mode resonance located 51 nm away from the core Mode reflection resonance shift by 0.17 nm and 13.54 dB respectively during the formation of a ~200 nm thick layer. For the spectrally adjacent azimuthally polarized resonance, the corresponding shifts are 0.45 nm and 16.34 dB. In both cases, the amplitudes of the resonance go through a pronounced minimum of about 5 dB for thickness between 80 and 100 nm and at the same time the wavelengths shift discontinuously. These effects are discussed in terms of the evolving metallic boundary conditions perceived by the Cladding Modes as the nanoparticles grow. Scanning Electron Micrographs and observations of Cladding Mode light scattering by nanoparticle layers of various thicknesses reveal a strong correlation between the TFBG polarized transmission spectra, the grain size and fill factor of the nanoparticles, and the scattering efficiency. This allows the preparation of gold nanoparticle layers that strongly discriminate between radially and azimuthally polarized Cladding Mode evanescent fields, with important consequences in the plasmonic properties of these layers.

  • enhanced axial strain sensitivity in plasmonic tilted fiber bragg gratings sensors
    OFS2012 22nd International Conference on Optical Fiber Sensors, 2012
    Co-Authors: Valerie Voisin, Christophe Caucheteur, Patrice Megret, Jacques Albert
    Abstract:

    This paper experimentally analyses the axial strain sensitivity of gold-coated tilted fiber Bragg gratings immersed in liquid. For the polarization Mode P (polarization parallel to the tilt plane), a strong attenuation of some Cladding Mode resonances appears in the transmitted spectrum due to the coupling with the Plasmon wave. When axially straining the grating, we report a unique behavior for the Cladding Mode resonance that presents the strongest attenuation. It presents an axial strain sensitivity (1.33 pm/μe) higher than the Bragg wavelength (1.28 pm/μe) and much higher than neighboring Cladding Modes (1.16 to 1.22 pm/μe), meaning that differential strain measurements can be achieved with such a sensing platform.

  • Directional bend sensor based on re-grown tilted fiber bragg grating
    Journal of Lightwave Technology, 2010
    Co-Authors: Li-yang Shao, Chengkun Chen, Lingyun Xiong, Albane Laronche, Jacques Albert
    Abstract:

    A novel fiber optic bend sensor is implemented by using a re-grown tilted fiber Bragg grating (TFBG) written in a small core single Mode fiber with UV overexposure. The spectrum of the re-grown TFBG contrasts with that of normal TFBG by exhibiting large differences in the amplitude between neighboring symmetric (LP0m) and asymmetric (LP1m) Cladding Mode resonances, moreover each asymmetric Cladding Mode resonance splits into two peaks (corresponding to two orthogonal polarization states). The differential response of the three individual resonances of such group provides quantitative information about the magnitude and directions of bends in the TFBG. Numerical simulations indicate that the changes in the Cladding-Mode profiles in a bent fiber are responsible for this behavior through their impact on coupling coefficients. A bend sensitivity of 0.4 dB. m (for the 18th order group of Cladding Modes) is experimentally demonstrated within a range of 0-10.6 m- 1.

  • Temperature Insensitive Refractometer Using Core and Cladding Modes in Open-Top Ridge Waveguide
    IEEE Sensors Journal, 2008
    Co-Authors: Robert B. Walker, Chengkun Chen, Stephen J. Mihailov, Chantal Blanchetiere, Claire L. Callender, Jacques Albert
    Abstract:

    In order to overcome the well-known limitation of temperature instability in Bragg grating waveguide sensors, a temperature insensitive open-top ridge waveguide refractometer is developed by using a Cladding Mode resonance as a temperature reference. The relative shift of the core Mode resonance to Cladding Mode resonance is used to measure the refractive index of substances under test. Specifically, the device fabricated here produces a relative resonance shift of 1 pm for every 5 times10-4 of measured index change, with a temperature sensitivity ~ 0.5 pm/degC.

Na Chen - One of the best experts on this subject based on the ideXlab platform.

  • Fiber Bragg grating Cladding Mode resonance liquid-level sensor
    20th International Conference on Optical Fibre Sensors, 2009
    Co-Authors: Na Chen
    Abstract:

    A Fiber-optic liquid-level sensor based on etched fiber Bragg grating (FBG) Cladding Mode resonance is proposed and demonstrated both theoretically and experimentally. The theoretical Model of the FBG Cladding Mode liquid-level sensor is built under a three-layer step-index fiber geometry. Response of Cladding Mode resonance spectra to the variation of ambient liquid level are studied and simulated numerically with couple Mode theory and transmission matrix method. In the experiments, a chemical etching method is adopted to diminish the fiber Cladding diameter and increase the sensitivity of Cladding Mode resonances to the ambient refractive index change. Dependences of FBG Cladding Mode resonance spectra on the liquid-level variation are measured and the experiments data match the Model well.

  • temperature insensitivity bending sensor based on Cladding Mode resonance of special optical fiber
    IEEE Photonics Technology Letters, 2009
    Co-Authors: Fufei Pang, Wenbin Liang, Zhenyi Chen, Na Chen, Wenchao Xiang, Xianglong Zeng, Tingyun Wang
    Abstract:

    A temperature-insensitive fiber bending sensor is demonstrated by using a special optical fiber with Cladding-Mode resonance. The special fiber with a pure silica core and a fluorine-doped silica inner Cladding shows strong Cladding-Mode resonance. The single-Mode fiber (SMF)-special fiber-SMF is proposed as a sensor head to monitor the Cladding-Mode resonance. The response of the resonant spectrum exhibits high sensitivity to bending curvature and inherent insensitivity to temperature. The proposed special fiber bending sensor is simple and inexpensive.

  • Cladding Mode Resonance Based Fiber for Temperature Measurement
    2008 China-Japan Joint Microwave Conference, 2008
    Co-Authors: Wenchao Xiang, Zhenyi Chen, Tingyun Wang, Na Chen, Fufei Pang
    Abstract:

    In this paper, we proposed and demonstrated a novel temperature sensor with high sensitivity based on special fibers. It works on the principle of strong resonance between core Mode and Cladding Mode. Through the thin thickness of inner Cladding, the Cladding Mode is strongly excited and the resonant center wavelength is very sensitive to the refractive index variation of coating material. By coating silicone around the special fiber, its temperature sensitivity was investigated experimentally. The results showed a high sensitivity and a good repeatability.

  • special optical fiber for temperature sensing based on Cladding Mode resonance
    Optics Express, 2008
    Co-Authors: Fufei Pang, Zhenyi Chen, Na Chen, Wenchao Xiang, Xianglong Zeng, Tingyun Wang
    Abstract:

    A fiber-optic temperature sensor by using a multi-Cladding special fiber is presented. It works on the basis of leaky Mode resonance from fiber core to outer Cladding. With the thin-thickness inner Cladding, the Cladding Mode is strongly excited and the resonant spectrum is very sensitive to the refractive index variation of coating material. By coating the special fiber with temperature-sensitive silicone, the temperature response was investigated experimentally from -20°C to 80°C. The results show high temperature sensitivity (240pm/°C at 20°C) and good repeatability.

  • A Micro-displacement sensor based on Cladding Mode resonance of optical special fiber
    Proceedings of 2008 China-Japan Joint Microwave Conference CJMW 2008, 2008
    Co-Authors: Wenbin Liang, Zhenyi Chen, Fufei Pang, Na Chen, Tingyun Wang
    Abstract:

    A novel micro-displacement sensor based on the special fiber Cladding Mode resonance is proposed and demonstrated experimentally. The special fiber with double Cladding was spliced into single Mode fiber which presented very strong resonant spectrum. Based on the high sensitivity to fiber curvature, the micro-displacement sensor was researched. As indicated by experimental results, the sensitivity is achieved to be about 0.1 nm/um. With the high sensitivity, the micro-displacement sensor can be found wide applications in fields of structure health monitor, aerospace, MEMS and so on.

Tingyun Wang - One of the best experts on this subject based on the ideXlab platform.

  • refractive index sensitivity enhancement of optical fiber Cladding Mode by depositing nanofilm via ald technology
    Optics Express, 2013
    Co-Authors: Ying Zhao, Zhenyi Chen, Fufei Pang, Yanhua Dong, Tingyun Wang
    Abstract:

    The atomic layer deposition (ALD) technology is introduced to enhance the sensitivity of optical fiber Cladding Mode to surrounding refractive index (SRI) variation. The highly uniform Al2O3 nanofilm was deposited around the double Cladding fiber (DCF) which presents Cladding Mode resonant feature. With the high refractive index coating, the Cladding Mode resonant spectrum was tuned. And the sensitivity enhancement for SRI sensor was demonstrated. Through adjusting the deposition cycles, a maximum sensitivity of 723 nm/RIU was demonstrated in the DCF with 2500 deposition cycles at the SRI of 1.34. Based on the analysis of Cladding Modes reorganization, the Cladding Modes transition of the coated DCF was investigated theoretically. With the high performance nanofilm coating, the proposed SRI sensor is expected to have wide applications in chemical sensors and biosensors.

  • temperature insensitivity bending sensor based on Cladding Mode resonance of special optical fiber
    IEEE Photonics Technology Letters, 2009
    Co-Authors: Fufei Pang, Wenbin Liang, Zhenyi Chen, Na Chen, Wenchao Xiang, Xianglong Zeng, Tingyun Wang
    Abstract:

    A temperature-insensitive fiber bending sensor is demonstrated by using a special optical fiber with Cladding-Mode resonance. The special fiber with a pure silica core and a fluorine-doped silica inner Cladding shows strong Cladding-Mode resonance. The single-Mode fiber (SMF)-special fiber-SMF is proposed as a sensor head to monitor the Cladding-Mode resonance. The response of the resonant spectrum exhibits high sensitivity to bending curvature and inherent insensitivity to temperature. The proposed special fiber bending sensor is simple and inexpensive.

  • Cladding Mode Resonance Based Fiber for Temperature Measurement
    2008 China-Japan Joint Microwave Conference, 2008
    Co-Authors: Wenchao Xiang, Zhenyi Chen, Tingyun Wang, Na Chen, Fufei Pang
    Abstract:

    In this paper, we proposed and demonstrated a novel temperature sensor with high sensitivity based on special fibers. It works on the principle of strong resonance between core Mode and Cladding Mode. Through the thin thickness of inner Cladding, the Cladding Mode is strongly excited and the resonant center wavelength is very sensitive to the refractive index variation of coating material. By coating silicone around the special fiber, its temperature sensitivity was investigated experimentally. The results showed a high sensitivity and a good repeatability.

  • special optical fiber for temperature sensing based on Cladding Mode resonance
    Optics Express, 2008
    Co-Authors: Fufei Pang, Zhenyi Chen, Na Chen, Wenchao Xiang, Xianglong Zeng, Tingyun Wang
    Abstract:

    A fiber-optic temperature sensor by using a multi-Cladding special fiber is presented. It works on the basis of leaky Mode resonance from fiber core to outer Cladding. With the thin-thickness inner Cladding, the Cladding Mode is strongly excited and the resonant spectrum is very sensitive to the refractive index variation of coating material. By coating the special fiber with temperature-sensitive silicone, the temperature response was investigated experimentally from -20°C to 80°C. The results show high temperature sensitivity (240pm/°C at 20°C) and good repeatability.

  • Cladding Mode resonance of special optical fiber for bending sensor with temperature insensitivity
    19th International Conference on Optical Fibre Sensors, 2008
    Co-Authors: Tingyun Wang, Wenbin Liang, Fufei Pang, Wenchao Xiang, Xianglong Zeng, Zhenyi Chen
    Abstract:

    In this paper, we fabricated and demonstrated a temperature-insensitive fiber bending sensor based on a special optical fiber with Cladding Mode resonance. The special fiber, with pure silica core and a fluorine-codoped inner Cladding, fabricated by using conventional MCVD technique exhibited strong Cladding Mode resonance. The bend curvature dependence of resonant spectrum was investigated with high sensitivity to be -10.15nm•m-1 and was found to possess an insensitivity to temperature. The proposed special fiber bending sensor is simple and low cost.

Bo Dong - One of the best experts on this subject based on the ideXlab platform.

  • Mode Division Multiplexing in a Fiber Modal Interferometer for Dual-Parameters Measurement
    IEEE Photonics Technology Letters, 2016
    Co-Authors: Bo Dong, Yuqi Peng, Yixin Wang, Changyuan Yu
    Abstract:

    We propose a novel scheme for simultaneous strain and temperature measurement by Mode division multiplexing (MDM) in a dual Cladding Modes fiber up-taper interferometer. The fiber interferometer, with a strong Cladding Mode and a weak Cladding Mode, can be constructed by fabricating two optimized adjacent fiber up-tapers along a single-Mode fiber. With the MDM method, the temperature and strain measurement resolutions reach ±0.05 °C and $\pm 3.14~\mu \varepsilon $ , respectively, which are much higher than those of the other proposed dual-parameters (temperature and strain) measurement solutions.

  • Mode Division Multiplexing in a Fiber Modal Interferometer for Dual-Parameters Measurement
    IEEE Photonics Technology Letters, 2016
    Co-Authors: Bo Dong, Yuqi Peng, Yixin Wang, Changyuan Yu
    Abstract:

    We propose a novel scheme for simultaneous strain and temperature measurement by Mode division multiplexing (MDM) in a dual Cladding Modes fiber up-taper interferometer. The fiber interferometer, with a strong Cladding Mode and a weak Cladding Mode, can be constructed by fabricating two optimized adjacent fiber up-tapers along a single-Mode fiber. With the MDM method, the temperature and strain measurement resolutions reach ±0.05 °C and ±3.14 με, respectively, which are much higher than those of the other proposed dual-parameters (temperature and strain) measurement solutions.

  • Cladding Mode resonance in polarization maintaining photonic crystal fiber based sagnac interferometer and its application for fiber sensor
    Journal of Lightwave Technology, 2011
    Co-Authors: Bo Dong, Chin-yi Liaw, Zhaowen Xu
    Abstract:

    A novel Cladding-Mode-resonance-based polarization-maintaining photonic-crystal-fiber Sagnac interferometer (PMPCF-SI) and its application for fiber sensor are demonstrated. By introducing a Mode field diameter mismatch at a splicing joint of an inbuilt single-Mode fiber (SMF)-PMPCF-SMF structure connected in an SI, an intermodal interference is constructed by the excited Cladding Modes and the polarization Modes of the PMPCF. With such a PMPCF-SI, simultaneous strain and temperature measurements are demonstrated. The SI behaves as a sensor and a filter simultaneously. By measuring the wavelength variation and transmissivity difference between two almost symmetrical resonance peaks in the spectral response of the SI, simultaneous strain and temperature measurements are achieved.

  • Low-splicing-loss polarization-maintaining photonic-crystal-fiber-based Sagnac interferometer and its Cladding-Mode effect
    Applied Optics, 2010
    Co-Authors: Bo Dong, Zhaowen Xu, Chin-yi Liaw, Yu Song Meng
    Abstract:

    A low-splicing-loss polarization-maintaining photonic-crystal-fiber (PMPCF)-based optical fiber Sagnac interferometer (OFSI) and its Cladding-Mode effect are demonstrated experimentally and analytically. An OFSI with minimum splicing loss of about 2.6 dB is achieved. The weak Cladding Modes induced by residual Mode field diameter mismatch at the fusion splice cause a filtering effect on the transmission spectra of the OFSIs. This is especially noticeable for short length PMPCF-based OFSIs. Experimental results show that the relatively maximum ripple fluctuation induced by the Cladding Mode can reach 5.7%. The Cladding-Mode effect can be eliminated by slightly bending the PMPCF, but this introduces additional insertion loss.

Fufei Pang - One of the best experts on this subject based on the ideXlab platform.

  • refractive index sensitivity enhancement of optical fiber Cladding Mode by depositing nanofilm via ald technology
    Optics Express, 2013
    Co-Authors: Ying Zhao, Zhenyi Chen, Fufei Pang, Yanhua Dong, Tingyun Wang
    Abstract:

    The atomic layer deposition (ALD) technology is introduced to enhance the sensitivity of optical fiber Cladding Mode to surrounding refractive index (SRI) variation. The highly uniform Al2O3 nanofilm was deposited around the double Cladding fiber (DCF) which presents Cladding Mode resonant feature. With the high refractive index coating, the Cladding Mode resonant spectrum was tuned. And the sensitivity enhancement for SRI sensor was demonstrated. Through adjusting the deposition cycles, a maximum sensitivity of 723 nm/RIU was demonstrated in the DCF with 2500 deposition cycles at the SRI of 1.34. Based on the analysis of Cladding Modes reorganization, the Cladding Modes transition of the coated DCF was investigated theoretically. With the high performance nanofilm coating, the proposed SRI sensor is expected to have wide applications in chemical sensors and biosensors.

  • temperature insensitivity bending sensor based on Cladding Mode resonance of special optical fiber
    IEEE Photonics Technology Letters, 2009
    Co-Authors: Fufei Pang, Wenbin Liang, Zhenyi Chen, Na Chen, Wenchao Xiang, Xianglong Zeng, Tingyun Wang
    Abstract:

    A temperature-insensitive fiber bending sensor is demonstrated by using a special optical fiber with Cladding-Mode resonance. The special fiber with a pure silica core and a fluorine-doped silica inner Cladding shows strong Cladding-Mode resonance. The single-Mode fiber (SMF)-special fiber-SMF is proposed as a sensor head to monitor the Cladding-Mode resonance. The response of the resonant spectrum exhibits high sensitivity to bending curvature and inherent insensitivity to temperature. The proposed special fiber bending sensor is simple and inexpensive.

  • Cladding Mode Resonance Based Fiber for Temperature Measurement
    2008 China-Japan Joint Microwave Conference, 2008
    Co-Authors: Wenchao Xiang, Zhenyi Chen, Tingyun Wang, Na Chen, Fufei Pang
    Abstract:

    In this paper, we proposed and demonstrated a novel temperature sensor with high sensitivity based on special fibers. It works on the principle of strong resonance between core Mode and Cladding Mode. Through the thin thickness of inner Cladding, the Cladding Mode is strongly excited and the resonant center wavelength is very sensitive to the refractive index variation of coating material. By coating silicone around the special fiber, its temperature sensitivity was investigated experimentally. The results showed a high sensitivity and a good repeatability.

  • special optical fiber for temperature sensing based on Cladding Mode resonance
    Optics Express, 2008
    Co-Authors: Fufei Pang, Zhenyi Chen, Na Chen, Wenchao Xiang, Xianglong Zeng, Tingyun Wang
    Abstract:

    A fiber-optic temperature sensor by using a multi-Cladding special fiber is presented. It works on the basis of leaky Mode resonance from fiber core to outer Cladding. With the thin-thickness inner Cladding, the Cladding Mode is strongly excited and the resonant spectrum is very sensitive to the refractive index variation of coating material. By coating the special fiber with temperature-sensitive silicone, the temperature response was investigated experimentally from -20°C to 80°C. The results show high temperature sensitivity (240pm/°C at 20°C) and good repeatability.

  • Cladding Mode resonance of special optical fiber for bending sensor with temperature insensitivity
    19th International Conference on Optical Fibre Sensors, 2008
    Co-Authors: Tingyun Wang, Wenbin Liang, Fufei Pang, Wenchao Xiang, Xianglong Zeng, Zhenyi Chen
    Abstract:

    In this paper, we fabricated and demonstrated a temperature-insensitive fiber bending sensor based on a special optical fiber with Cladding Mode resonance. The special fiber, with pure silica core and a fluorine-codoped inner Cladding, fabricated by using conventional MCVD technique exhibited strong Cladding Mode resonance. The bend curvature dependence of resonant spectrum was investigated with high sensitivity to be -10.15nm•m-1 and was found to possess an insensitivity to temperature. The proposed special fiber bending sensor is simple and low cost.