A. Sivanantha Raja

Design and optimization of two dimensional photonic crystal based optical filter

In this paper, the channel drop filter based on two dimensional photonic crystal is proposed. The structure is made of silicon rods with the refractive index n1 = 3.4641 which are perforated in air with refractive index n2 = 1. The simulation results are obtained using 2D finite difference time domain (FDTD) method. The photonic band gap is calculated by plane wave expansion solver method. Resonant mode of the ring resonator and the filter transmission spectrum is calculated using 2D FDTD method. Full width half maximum (FWHM) bandwidth of the filter at the output transmission spectrum from 1.508 μm to 1.512 μm is 4 nm. The quality factor of the filter is 377.5 and the proposed filter design is around 21 × 15 μm which is suitable for photonic integrated circuits.

Design and optimization of photonic crystal fiber with improved optical characteristics

A highly birefringent photonic crystal fiber (PCF) with large nonlinearity, low dispersion and low confinement loss is designed by introducing a solid elliptical core structure with spiral lattice of circular air holes as a cladding. The dependence of different geometrical parameters, such as pitch size, diameter of air holes and arrangement of air holes are investigated. By optimizing the available parameters, the designed elliptical–spiral PCF offers high birefringence up to 0.005264, high nonlinearity up to 8683.59W−1km−1, low chromatic dispersion of − 9072.62ps/nm/km, and low confinement loss of 0.00305dB/km within a wide wavelength range of 1000–2000nm.

Parametric Analysis of Mobile Ad-Hoc Network Environment

ABSTRACT A mobile Ad-Hoc Network (MANET) is a collection of wireless nodes that communicate with each other without any infrastructure. Present day mobile ad hoc networks grow in size and the associated complexity warrant the need to explore the suitability of the various simulation parameters during scenario.their execution. This paper presents a study on the timing Analysis for common MANET (mobile ad hoc network) parameters. Index terms: AODV, DSR, MANET, Random waypoint mobility model, Mobile Node, Transmission Range and scalability I. INTRODUCTION Mobile ad hoc networks (MANETs) is a self-configuring network of mobile routers (and associated hosts) connected by wireless links. Communication must be set up and maintained on the fly over mostly by wireless links. Each node of a network can both route and forward data [1]. The exploding demand for computing and communication on the move has led to reliance for ad hoc networks. Although substantial attempts have been made on research towards design and development of ad hoc network parameters, there is relatively little understanding of their behaviour in terms of the performance by comparing execution times as the system is scaled up [2] & [8]. Figure 1 First, it is unclear whether any existing ad hoc application traffics can be used to successfully perform within the given terrain dimensions which will be necessary in large scale wireless networks. Second, it is also ambiguous that which of the preceding traffics is likely to perform better as the size of the network grows [3]. In this paper represents the execution time analysis by varying different MANET simulation parameters. Because execution time is a main parameter for analyzing the performance of mobile ad-hoc network. Here we are using the simulation tool GloMoSim for large scale scenarios to obtain execution time analysis by varying different simulation parameters. Because it is giving more accuracy while constructing large scale scenarios.

Performance analysis of a Colorimeter designed with RGB color sensor

The ldquoGold standardrdquo for testing blood glucose in Colorimeters is the measurement of glucose in a plasma sample obtained from a vein. This method involves a chemical reaction activated by an enzyme called Glucose Oxidase. Most of the Colorimeters used for the Glucose measurement in Clinical laboratories perform well in the 100-400 mg/dL range of blood glucose. Due to the requirement of highly monochromatic source and photo detector, an error of 5 to 20% is common in these Colorimeters. This paper aims to mitigate the error in measurement by modernizing the plasma glucose testing equipment i.e., Colorimeter with White Source and RGB Color Sensor through Color measurement technique for better clinical diagnosis. As presumed, experimental results show that this modified Colorimeter can perform well with better accuracy even above the Glucose concentration of 400 mg/dL.

Frequency quadrupling with improved OSSR and RFSSR for radio over fiber applications

A filterless and Tunable Optical Millimeter Wave Generation via frequency quadrupling with improved Unwanted Optical Sideband Suppression Radio (OSSR) and Radio Frequency Spurious Sideband Suppression Ratio (RFSSR) is demonstrated based on parallel Lithium Niobate Mach-Zehnder Modulator (LN-MZM). The biasing parameters of the MZMs are varied carefully to achieve quadrupling of the input local oscillator without involving optical filters. A simulation experiment has been conducted to generate 60 GHz MM-Wave by quadrupling 15 GHz RF Local Oscillator. The OSSR of 57.2 dB and the RFSSR of 52 dB are achieved.

Design of a dual-core liquid-filled photonic crystal fiber coupler and analysis of its optical characteristics

The photonic crystal fiber coupler (PCFC) is one of the peculiar devices that play a major role in the future of optical networks. Dual-core PCFCs have many advantages over the conventional optical couplers such as more flexible design and shorter coupling length. In this paper we propose a silica-based PCFC with a hexagonal lattice structure, and important properties such as dispersion, effective refractive index, propagation characteristics, and coupling length are analyzed in comparison with benzene and chloroform liquid-filled PCFCs. The above properties are investigated under different geometrical parameters such as hole-to-hole spacing and different air hole diameter within a wide range of wavelengths. By proper adjustment of the dual-core PCFCs, the coupling lengths of 0.0006, 0.007, and 0.0008 m are achieved in the silica-, benzene-, and chloroform-filled PCFCs, respectively. Likewise, the dispersion values of −6987, −7055, and −6684  ps/(nm km) and the propagation constants of 10.9, 11.08, and 10.6 (×106)  rad/m are achieved in silica-, benzene-, and chloroform-filled PCFCs, respectively.

Dispersion compensation for WDM signals with polarization insensitivity

We have developed Parametric tunable dispersion compensator P-TDC for dispersion compensation of WDM signals with polarization insensitivity. The dispersion compensation is based upon the parametric processes in the highly non linear fibers (HNLF). This developed P-TDC compensates the dispersion of WDM signals irrespective of their state of polarization and at the same time, frequency is also preserved. We have demonstrated this dispersion compensator for the transmission of NRZ-OOK signals over 126km of DSF fiber and we have obtained the Q-factor in the range of 7.5.

AMM cladding fiber for coupled plasmonic propagation and core guidance

Dual effect of surface plasmon propagation and classical core guidance is made possible in this work with the integration of metamaterial in a fiber. Here, the alternate layers of

Performance analysis of Radio over Fiber systems using the brillouin-assisted carrier phase shift

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