Long period grating Research Papers (original) (raw)

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- by Saurabh Tripathi
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- Mechanical Engineering, Refractive Index, Applied Optics, Optical physics
- by Liu bo
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- Optics, Medical Imaging, Fiber Optics, Telecommunications
- by Rosane Falate
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- Materials Engineering, Analytical Chemistry, Quality Control, Optical Sensor
- by Ralph Tatam
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- Engineering, Measurement Science and Technology, Physical sciences, Refractive Index
- by Kyunghwan Oh
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- Optical Communication, Silica, Dispersion Compensation, Optical physics

We present experimental results on the performance of a series of coated, D-shaped optical fiber sensors that display high spectral sensitivities to external refractive index. Sensitivity to the chosen index regime and coupling of the fiber core mode to the surface plasmon resonance (SPR) is enhanced by using specific materials as part of a multi-layered coating. We present strong evidence that this effect is enhanced by post ultraviolet radiation of the lamellar coating that results in the formation of a nano-scale surface relief corrugation structure, which generates an index perturbation within the fiber core that in turn enhances the coupling. We have found reasonable agreement when we modeling the fiber device. It was found that the SPR devices operate in air with high coupling efficiency in excess of 40 dB with spectral sensitivities that outperform a typical long period grating, with one device yielding a wavelength spectral sensitivity of 12000 nm/RIU in the important aqueous index regime. The devices generate SPRs over a very large wavelength range, (visible to 2 μm) by alternating the polarization state of the illuminating light.

- by Chengbo Mou
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- Optical fiber sensor, Surface plasmon resonance, Refractive Index, Optical physics
- by Jose Luis Santos
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- Fiber optic sensor, Strain Measurement, Optical physics, Long period grating
- by gopinath mudhana
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- Engineering, Technology, Electronics, Fiber Bragg grating
- by Kyunghwan Oh
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- Optical Waveguide, Optical physics, Optical fiber, Optical Fiber Communication
- by P. Caldas
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- Quantum Physics, Optical physics, Long period grating, Mach-zehnder Interferometer
- by Jose Luis Santos
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- Optical Communication, Optical Sensor, Fiber Bragg grating, Silica
- by Ralph Tatam
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- Functional Materials, Silica, Spectrum, Long period grating
- by F. Chiavaioli
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- Fiber Bragg grating, Refractive Index, Temperature measurement, Spectrum
- by Vlastimil Matějec and +1
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- Materials Engineering, Analytical Chemistry, Silica, Refractive Index
- by Vipul Rastogi
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- Optical Waveguide, Optical physics, Sensitivity, Temperature Control
- by Francisco Araujo
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- Fiber optic sensor, Strain Measurement, Optical physics, Long period grating

Using long-period gratings (LPG) inscribed in photonic crystal fiber (PCF) and coupling this structure with an optically aligned flow cell, we have developed an optofluidic refractive index transduction platform for label-free biosensing. The LPG-PCF scheme possesses extremely high sensitivity to the change in refractive index induced by localized binding event in different solution media. A model immunoassay experiment was carried out inside the air channels of PCF by a series of surface modification steps in sequence that include adsorption of poly(allylamine hydrochloride) monolayer, immobilization of anti-rat bone sialoprotein monoclonal primary antibody, and binding interactions with non-specific goat anti-rabbit IgG (H+L) and specific secondary goat anti-mouse IgG (H+L) antibodies. These adsorption and binding events were monitored in situ using the LPG-PCF by measuring the shift of the core-to-cladding mode coupling resonance wavelength. Steady and significant resonance chang...

- by Henry Du
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- Engineering, Analytical Chemistry, Biomedical Engineering, Finite Element Methods

A photoplotter, based on a digital micromirror device as real-time reconfigurable mask, is designed to direct-write microstructures in different photosensitive materials. Binary and multilevel elements, such as computer generated... more

- by K. Heggarty
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- Optical Waveguide, Optical Properties, Real Time, Optical physics
- by Vipul Rastogi
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- Mechanical Engineering, Integrated Optics, Sensors, Optical Waveguide
- by Jin YAN
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- Biosensors, Long-baseline optical interferometry, Optical fiber sensor, Refractive Index
- by James Heflin
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- Optical Sensor, Engineering Science, Long period grating, Experimental Measurement
- by Richard Oleschuk
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- Photonics, Refractive Index, Optical physics, Long period grating
- by Vladimir Sulimov
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- Technology, High Temperature, Optical physics, Long period grating
- by Romeo Selvas
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- Materials Science, Optics, Interferometry, Optical
- by Faramarz E. Seraji
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- Optical Fiber Communications, Optical physics, Total Length, Filter Design

We present an all-fiber Mach-Zehnder interferometer consisting of two consecutive fattened sections of dispersion-shifted fiber that act as in-series long period fiber gratings. The proposed Mach-Zehnder interferometer shows a broad fringe pattern ranging from 1000 to 1500 nm and is stable against changes in temperature and strain. By tapering a section of 5mm in length to 50% diameter between the fattened sections we observe an increased sensitivity to temperature changes. The measured temperature and strain sensitivities were in the range of 9–17 pm/°C and 1.44–2.9 pm/μɛ, respectively.

- by Julian Estudillo-ayala
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- Optical, Long period grating, Mach-zehnder Interferometer, Mach Zehnder
- by Luciano Mescia
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- Long period grating, Photonic crystal fiber, Single Mode
- by Emmanuel Marin
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- Fiber Bragg grating, Refractive Index, Optical physics, Optical fiber
- by Daniele Costantini and +1
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- Optical physics, Optical fiber, Long period grating, Electrical And Electronic Engineering
- by Rashmi Singh
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- Mechanical Engineering, Fiber Optics, Applied Optics, Optical physics
- by jose erick laguna cruz
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- Fiber Laser, Optical physics, Spectrum, Optical fiber
- by Ralph Tatam
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- Quantum Physics, Optical physics, Long period grating, Fiber Optic
- by Jose Luis Santos
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- Analytical Chemistry, Sensors, Optical fiber sensor, Refractive Index
- by Amita Kapoor
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- Mechanical Engineering, Refractive Index, Applied Optics, Optical physics
- by Marten de Vries
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- Civil Engineering, Structures and Fire Engineering, Smart Structure, Nondestructive Evaluation
- by Waleed Mohammed
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- Fiber Laser, Laser beam shaping, Beam shaping, Optical physics
- by Kyunghwan Oh
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- Optical physics, Optical fiber, Wavelength Division Multiplexing, Optical Fiber Communication
- by Hadi Haryono
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- Optics, Fiber Bragg grating, Refractive Index, Optical physics
- by Dimitrios Zografopoulos
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- Applied Mathematics, Optical physics, Microstructures, Long period grating
- by Ilda Abe
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- Analytical Chemistry, Food Analysis, Oils, Optical fiber sensor
- by O. Medvedkov and +2
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- Biomedical Engineering, Silica, Nitrogen, Radiation Effect
- by P. Caldas
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- Materials Engineering, Analytical Chemistry, Optical fiber sensor, Refractive Index
- by Ralph Tatam
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- Structural Integrity, Process Monitoring, Refractive Index, Optical Fibre
- by R. Kamikawachi
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- Engineering, Materials Science, Spectrum, Tunable Filter
- by Gaspar Rego
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- Optical physics, Long period grating, Electrical And Electronic Engineering
- by Wing-Ki Liu
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- Engineering, Mechanical Engineering, Composites, Fiber Bragg grating
- by frank davis
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- Materials Engineering, Analytical Chemistry, Functional Materials, Calixarene

Present study deals with analytical analysis of intensity dependent delay and higher order dispersion properties of long period fiber grating. A nonlinear coupled mode equation of grating has been utilized and solved in a very simple manner to obtain the mathematical expression of intensity dependent delay, group velocity, first, second and third higher order dispersion properties of long period grating under nonlinear Kerr regime. The results show that the intensity of the incident beam modifies the spectral properties of long period grating. It is found that overall dispersion of the grating shifts to another wavelength when intensity of the beam produce the Kerr effect inside the grating. Reported results of nonlinear grating in the paper can be useful for designing of dispersion compensator devices to compensate the broadening of the optical pulses in long haul optical communication link.

- by IAEME Publication
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- Dispersion, Delay, Long period grating, Iaeme Ijaret
- by Andrei Fotiadi
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- Photonic Crystals, Modulation, Photonic Crystal Fibre, Fabrication
- by AMPARO RODRIGUEZ
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- Engineering, Physics, Physical sciences, Long period grating

Long period grating Research Papers (original) (raw)

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