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We present a technique to determine the charge of a complex amplitude by extracting its Fourier-Bessel descriptors. The Cartesian signal is transformed to the polar frequency domain through the Fourier-Bessel Transform and analyzed.
We have studied the spatial intensity distribution of optical vortex beams both theoretically and experimentally. We show that the area of the bright ring present in optical vortex increases with its order along with the inner and outer radii of the vortex beams.
Propagation characteristics of a solid defect-core W-type photonic crystal fiber have been investigated by using finite element method. The proposed W-type photonic crystal fiber can perform as single-mode fiber with low dispersion and bend loss for large wavelength range and hence can be utilized for telecommunications as well as sensing.
The manufacturing process of flexible substrates develops the residual stress which leads to the birefringence. This birefringence can affect the polarization of the light passing through substrate along with the spectral changes in LCDs. We report that the effect of the birefringence of flexible substrate on the polarization state of the light passing through it. We observed that by aligning the...
Superposition of two optical vortex beams form composite vortex beam and the characteristics of the resultant depend on the separation and the relative phases of the interfering vortex beams. We analyze these composite vortex filters.
Present work reports the nonlinear refractive index of Se85−xTe15Bix thin films which depends upon linear refractive index. Increase in nonlinear refractive index is attributed to increased polarizability due to larger Bi radii.
Erbium doped fiber amplifier is a key device in WDM/DWDM technology. The task of modeling EDFA is computationally expensive. In this paper we investigate the application of multilayered feed-forward neural network to model an EDFA.
A continuous-wave thulium-doped fiber laser at around 1.9 µm has been demonstrated in all-fiber ring configuration. Single-wavelength and multi-wavelength lasing has been observed at different lengths of the doped fiber in the filterless configuration.
Light coupling into silicon wafer solar cells can be enhanced significantly using low cost aluminium nanoparticles embedded in antireflection coating, which is due to the increased forward scattering upon surface plasmon excitation.
Zinc oxide (ZnO) thin film is grown on glass substrate by the sol-gel spin coating technique. The prepared film annealed at 450 °C. X-ray diffraction shows that the ZnO Film is polycrystalline with (002) preferential orientation. We have found the Surface roughness was minimum (12.4 nm) by atomic force microscopy. The optical band gap is found to be 3.12±0.01 eV by UV-visible Spectroscopy. The Wave...
We present a survivable strategy named as global reservation based shared path protection (GR-SPP) to address the issue of single-link failure in multi-domain network. The proposed strategy provides least blocking probability and better resource utilization ratio.
A new technique for cavity ring down spectroscopy is demonstrated by utilising multipulsing in Q-switched fiber lasers. The ring down time is found to increase with absorption and the suggested scheme has improved detection sensitivity.
Multi-parameter sensing in the form of sensor arrays functionalized with multiple receptors, is an approach for attaining selectivity in sensing. We have demonstrated a novel fiber sensor based on an etched Bragg grating whose core is coated with materials such as polyelectrolytes, carbon nanotubes, and polyallylamine-amino-carbon nanotubes, and can be used for detecting gases, pH, humidity, refractive...
A coaxial fiber of chosen length, supporting two symmetric modes (LP01 and LP02), excited by periodic sequence of Gaussian temporal light pulses of chosen repetition rate, regenerates original pulse sequence -“Talbot Effect” in time domain.
Light trapping in the thin film solar cell has been studied for a while and is considered as among the most important parameter which may reduce the gap between the most efficient single junction thin film solar cell available till date and the theoretical Shockley-Queisser (SQ) Limit. Usually, metallic back reflectors are being used for the thin film solar cells. Here we are presenting an alternative...
The enhanced Goos-Hänchen (GH) shift due to surface plasmons excitation at the metal-dielectric interface is measured using Stokes polarimetry and is found to agree well with theoretical calculation and position-sensitive detector based measurement
Estimation of the blood oxygen saturation in human retina has been done by using FDOCT data. This was achieved by using 1060 nm as central wavelength, 120 nm as bandwidth, which is optimized wavelength for imaging biological samples. Least squares method was implemented for data analysis. The estimated results of blood oxygen saturation levels in an artery and the veins are well comparable with existing...
We demonstrate the fabrication of chemically etched 2×2 fiber-coupler using a real-time transmission monitoring setup. The transmission-signature provides adequate feedback to control the power-dividing process in attaining targeted specification towards realizing various all-fiber branching components.
We demonstrate a digital holographic microscope platform for phase imaging of micron scale samples. A method for quantitative phase visualization and compensation of the aberrations in coherence microscopic imaging is proposed. Preliminary results are presented as proof of concept for aberration corrections.
The erbium doped fiber amplifier gain spectrum has been equalized over a range of 33 nm within an accuracy of ± 0.39 dB by employing a novel all-fiber interferometric configuration.
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