Showing papers in "Photonics in 2012"
TL;DR: PbI2 nano/micro crystals are obtained by environmentally-friendly, easily scaled up solvothermal route and subsequent Inorganic-Organic (IO) hybrid nano-micro crystals of (C12H25NH3)2Pb I4 (20nm to about 7μm) are produced by intercalation of organic moiety as mentioned in this paper.
Abstract: PbI2 nano/micro crystals are obtained by environmentally-friendly, easily scaled up solvothermal route and subsequent Inorganic-Organic (IO) hybrid nano/micro crystals of (C12H25NH3)2PbI4 (20nm to about 7μm) are produced by intercalation of organic moiety.
15 citations
TL;DR: In this paper, a CBD technique was used to synthesize CdS and Ag doped nanoparticles and thin film with an average particle size of 7nm, characterized by X-RD, Absorption Spectrum, Photoluminescence spectrum, Scanning Electron Microscopy (SEM).
Abstract: A novel and simple CBD Technique has been utilized to synthesize CdS and Ag doped CdS nanoparticles and thin film with an average particle size of 7nm, characterized by X-RD, Absorption Spectrum, Photoluminescence spectrum, Scanning Electron Microscopy (SEM).
12 citations
TL;DR: In this article, the performance of FSO system with DAPPM (A×L = 16) scheme has been analyzed and it has been shown that, at relatively low turbulence, increasing the number of amplitude levels improves the performance.
Abstract: In this paper, performance of FSO system with DAPPM (A×L = 16) scheme has been analysed. We find that, at relatively low turbulence, increasing the number of amplitude levels improves the performance of the DAPPM scheme. At relatively high turbulence, performance is improved initially and then it starts degrading.
12 citations
TL;DR: Optically pumped single ring resonator based clocked D flip flop is reported and numerically simulated in this article, and proposed design is simple, yet novel, and will be helpful for future all optical signal and information processing.
Abstract: Optically pumped single ring resonator based clocked D flip flop is reported and numerically simulated. Proposed design is simple, yet novel, and will be helpful for future all optical signal and information processing.
9 citations
TL;DR: An analytical model is developed to evaluate burst loss probability in optical-burst switching (OBS) network by considering the regimes of short and long FDLs.
Abstract: An analytical model is developed to evaluate burst loss probability in optical-burst switching(OBS) network by considering the regimes of short and long FDLs. The impact of different node non-idealities on network performance is also estimated.
7 citations
TL;DR: Graphene oxide-ZnO/TiO2 nanoparticles were synthesized for optical limiting in this paper, where they were successfully conjugated using UV-Vis and FTIR results.
Abstract: Graphene oxide-ZnO/TiO2 nanoparticles are synthesized for optical limiting. Micro Raman studies reveal that GO sheets are limited to 6-8 layers. UV-Vis and FTIR results demonstrated that GO with ZnO/TiO2 nanoparticles are successfully conjugated.
7 citations
TL;DR: Full-duplex multimedia signal over single mode fiber using wavelength-division-multiplexing and Mach-Zehnder-Modulator is proposed and demonstrated and suitable for 100 km SMF transmission with excellent BER and eye-opening.
Abstract: Full-duplex multimedia signal over single mode fiber using wavelength-division-multiplexing and Mach-Zehnder-Modulator is proposed and demonstrated. Our proposed scheme is suitable for 100 km SMF transmission with excellent BER and eye-opening.
7 citations
TL;DR: In this article, the long-period gratings (LPGs) in optical fibers for sensing are discussed, especially on strain and temperature sensing, and low-cost fabrication by a low-pressure mercury-lamp exposure was described.
Abstract: Long-period gratings (LPGs) in optical fibers for sensing are discussed, especially on strain and temperature sensing. Low-cost fabrication by a low-pressure mercury-lamp exposure was described. LPGs in high-birefringence fiber had high strain sensitivity.
6 citations
TL;DR: In this paper, the authors discuss the challenges of large-scale photonic-electronic co-integration, including signal handling, variability, and cointegration of photonic circuits.
Abstract: Silicon photonics is a fast-growing technology, but the design capability for large-scale photonic-electronic circuits is lacking. Challenges include signal handling, variability and photonic-electronic co-integration. We will discuss these and the tools we are developing.
5 citations
TL;DR: In this article, an optimized process to deliver rare-earth compounds in vapor phase for fabrication of large-core Yb-doped fibers with uniform dopant distribution and good reproducibility is presented.
Abstract: Presenting an optimized process to deliver rare-earth compounds in vapor phase for fabrication of large-core Yb-doped fibers with uniform dopant distribution and good reproducibility. Fibers exhibit good optical properties, suitable for high power laser applications.
5 citations
TL;DR: In this article, a high sensitive pressure sensor based on fiber Bragg grating (FBG) assembled with thin metal diaphragm is reported, with a sensitivity of 205 × 10-2 MPa-1, approximately 10,350 times higher than that measured with the bare FBG.
Abstract: High sensitive pressure sensor based on fiber Bragg grating (FBG) assembled with thin metal diaphragm is reported The sensitivity of the pressure sensor is found to be 205 × 10-2 MPa-1, approximately 10,350 times higher than that measured with the bare FBG
TL;DR: In this article, the design details of a tunable fiber ring laser emitting in the mid-IR was presented, and the laser was found to be tunable from 1845 nm to 1945 nm, with the appropriate choice of cavity parameters.
Abstract: The design details of a tunable fiber ring laser emitting in the mid-IR is presented. Thulium doped fiber is used as the gain medium, and laser is found to be tunable from 1845 nm to 1945 nm, with the appropriate choice of cavity parameters.
TL;DR: In this paper, two zero dispersion points are achieved by varying and optimizing the core shape that can be critically controlled during fiber drawing process, which can be used during fiber fabrication.
Abstract: Microstructured fibers with high nonlinearity and tailored dispersion are designed, optimized and fabricated. Two zero dispersion points are achieved by varying and optimizing the core shape that can be critically controlled during fiber drawing process.
TL;DR: A novel computational method for image recovery in digital holography is proposed, which does not mimic the physical hologram reconstruction process and suggests single shot image recovery without the need of removing the dc terms and with relaxation of the minimum reference beam angle condition.
Abstract: We propose a novel computational method for image recovery in digital holography, which does not mimic the physical hologram reconstruction process. The reconstruction of the complex object field in the hologram plane is modeled as a constrained optimization problem with a smoothness constraint on the complex object function. The illustrative simulations suggest single shot image recovery without the need of removing the dc terms and with relaxation of the minimum reference beam angle condition that is usually required for twin image separation.
TL;DR: In this paper, the authors investigate self-pulsing phenomena in Yb-doped fiber amplifiers operated in the Master Oscillator Power Amplifier (MOPA) configuration and find that pulsing happens due to saturable absorption in certain sections of the doped fiber.
Abstract: We investigate self-pulsing phenomena in Yb-doped fiber amplifiers operated in the Master Oscillator Power Amplifier (MOPA) configuration and find that the pulsing happens due to saturable absorption in certain sections of the doped fiber.
TL;DR: In this paper, a localized surface plasmon resonance based optical fiber humidity sensor is developed by chemically synthesizing gold nanoparticle film onto the etched core region of a multimode optical fiber.
Abstract: Localized Surface Plasmon Resonance based optical fiber humidity sensor is developed by chemically synthesizing gold nanoparticle film onto the etched core region of a multimode optical fiber. Linear response is observed with greatly enhanced sensitivity.
TL;DR: In this paper, the authors study Levy statistics at the critical excitation of a nanophotonic, random amplifying system and observe sub-unity exponents for weak scattering systems that are sensitive to pump fluctuations, in contrast to strong scattering systems.
Abstract: We study Levy statistics at the critical excitation of a nanophotonic, random amplifying system. We observe sub-unity exponents for weak scattering systems that are sensitive to pump fluctuations, in contrast to strong scattering systems.
TL;DR: In this article, the detailed characterization of optical frequency combs that can be employed in future supechannel Tbit/s transmission systems is presented, which can be used for the development of future photonics systems.
Abstract: Optical Frequency Combs are becoming increasingly important for the development of future photonics systems. In this work we present the detailed characterization of optical frequency combs that can be employed in future supechannel Tbit/s transmission systems.
TL;DR: In this paper, the authors used plasmon active metals (gold and silver) along with chalcogenide glass to enhance electric field intensity by 360% thereby significantly affecting the study of biomolecular interactions occurring in the vicinity of metal-analyte interface.
Abstract: Plasmon active metals (gold and silver) along with chalcogenide glass have been used to enhance electric field intensity by 360% thereby significantly affecting the study of biomolecular interactions occurring in the vicinity of metal-analyte interface.
TL;DR: In this article, the average strain, strain gradient and full spectrum measurements were obtained from the FBGs for the structural health monitoring of composites for damage progression, failure discrimination and analysis.
Abstract: Damage progression, failure discrimination and analysis have been undertaken by embedding FBG sensor arrays as strain sensors. Average strain, strain gradient and full spectrum measurements were obtained from the FBGs for the structural health monitoring of composites.
TL;DR: In this article, a measurement-device-independent polarization shift keying scheme using two state polarization encoding is presented for optical free space laser communications through the atmosphere, where the polarization seems to be the most stable characteristic of a laser beam.
Abstract: A practical scheme for measurement-device-independent polarization shift keying using two state polarization encoding is presented. Most of the previous work on optical free space laser communications through the atmosphere was concentrated on intensity modulated systems. However, polarization modulated systems may be more appropriate for such communication links, because the polarization seems to be the most stable characteristic of a laser beam while propagating through the atmosphere. Thus, a detailed comparison between intensity and polarization modulated systems is of big interest.
TL;DR: In this article, a hardware model of 4x4 data vortex switch fabric is proposed for multistage interconnection networks and the reliability and fault tolerance of the architecture is analyzed.
Abstract: Reliability and fault tolerance are the important factors for multistage interconnection networks. In this paper, we propose a hardware model of 4x4 data vortex switch fabric. Also, we analyse the terminal reliability of the architecture.
TL;DR: In this article, an optimum optical signal detection scheme is proposed for reducing the scintillation effect, which is based on BER analysis of the signals using the instantaneous fading coefficient determined by a reference continuous light, shows an improvement in the performance.
Abstract: An optimum optical signal detection scheme is proposed for reducing the scintillation effect. A BER analysis of the signals is made using the instantaneous fading coefficient determined by a reference continuous light, shows an improvement in the performance.
TL;DR: In this paper, a fiber optic current sensor (FOCS) based on Sagnac interferometer is designed and tested for monitoring of current up to 4000 amperes for electric power industry application.
Abstract: A prototype fiber optic current sensor (FOCS) based on Sagnac interferometer is designed and tested for monitoring of current up to 4000 amperes for electric power industry application. Sensor is tested for nominal current one ampere as well as current up to eight hundred amperes. The output of sensor has nonlinearity of ±0.5% is presented.
TL;DR: In this paper, the authors simulated infrared radiation as broad as 1000nm by nonlinear parametric amplification in step index Chalcogenide fiber of length 20cm with a single CW pump near zero-dispersion wavelength ~ 2.94 μm of power 20 W.
Abstract: Infrared radiation as broad as 1000nm is simulated by nonlinear parametric amplification in step index Chalcogenide fiber of length 20cm with a single CW pump near zero-dispersion wavelength ~ 2.94 μm of power 20 W.
TL;DR: Lower aspect ratio gratings were designed for 633nm and fabricated by e-beam lithography in this article, where the simplified modal method allows compromises between height and efficiency.
Abstract: Highly efficient polarization separation requires very high aspect ratio gratings. The simplified modal method allows compromises between height and efficiency. Lower aspect ratio gratings are designed for 633nm and fabricated by e-beam lithography.
TL;DR: In this paper, a fiber optic sensor for the detection and estimation total cholesterol has been designed and developed, which showed a linear response in the range of 500ppm to 4000ppm of cholesterol levels.
Abstract: A Fiber Optic sensor for the detection and estimation total cholesterol has been designed and developed. The Long Period Grating (LPG) sensor developed showed a linear response in the range of 500ppm to 4000ppm of cholesterol levels. This is highly desirable for a commercial cholesterol sensor as the level of cholesterol for normal humans ranges from 1400ppm to 2000ppm.
TL;DR: In this article, the authors review photonic and optoelectronic applications of carbon nanotube (CNT) and graphene to such as light emitting, nonlinear, photovoltaic, modulating, and transparently conducting devices.
Abstract: We review photonic and optoelectronic applications of carbon nanotube (CNT) and graphene to such as light emitting, nonlinear, photovoltaic, modulating, and transparently conducting devices. We also present our works on application to short-pulse fiber lasers.
TL;DR: Spectroscopic study of laser induced one-step conjugation of gold nanoparticles to egg-white protein shows shift in amide I β-sheet structure of protein and thermal denaturation of proteins due to localized heating of gold Nanoparticles.
Abstract: Spectroscopic study of laser induced one-step conjugation of gold nanoparticles to egg-white protein shows shift in amide I β-sheet structure of protein and thermal denaturation of proteins due to localized heating of gold nanoparticles.
TL;DR: In this paper, a review of recent progress based on photonic crystals and metamaterials concepts is presented, with a focus on bio-medicine, environment and gas detection.
Abstract: Nano-photonic device structures provide a promising technological base for reliable sensing in a variety of applications, including bio-medicine, the environment and gas detection. This presentation will review some recent progress based on photonic crystals and metamaterials concepts.