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Our societies have been changing at speeds higher than expected; Rapid aging is one such big issue the world is now facing. Creating new circumstances that are safe, secure, convenient, comfortable and efficient even in home or office is an urgent topic for individuals and governments. Advances in ICT (Information and Communication Technology) is a promising solution. As the home is the most important...
Caring for sick, disabled, and elderly people in a home environment is a growing and challenging trend in many countries worldwide. To offer both the affected people and their caregivers a better quality of life, the use of low-cost health status monitoring devices that are networked in the home and through the Internet to healthcare centers is being explored. This paper gives a snapshot review of...
A bidirectional wavelength reconfigurable optical network is proposed. A remote pumped Erbium doped fiber amplifier and high-reflectivity tunable fiber Bragg gratings (TFBGs) are used in this wavelength reconfigurable fiber module. 10 Gb/s per channel over 20 km fiber span is used to verify the metro-network-range system performance. The power penalty is less than 1 dB when compares to the back to...
The interest of implementation of advanced modulation formats in metro and access networks has experienced a steady increase under the influence of exponentially increasing data amount from multimedia services like videoconferencing, high definition television, video on demand, interactive games and others. The transition period to advanced modulation formats requires a solution for efficient all-optical...
Traffic shaping is a mechanism used by Internet Service Providers (ISPs) to limit subscribers' traffic based on their service contracts. This paper investigates the current implementation of traffic shaping based on the token bucket filter (TBF), discusses its advantages and disadvantages, and proposes a cooperative TBF that can improve subscribers' quality of service (QoS)/quality of experience (QoE)...
Wireless channels are usually multipath fading channel. The large and small scale fading is used in massive multiple-input and multiple-output (MIMO) channel. The large scale fading channel matrix accounts shadow fading and path loss and the small scale fading channel accounts a changeable wavelength. In this paper we assume perfect multipath fast channel estimation and the reduction of a a pilot...
Free space optical communication (FSO) links have gained huge popularity in last couple of decades. In this paper FSO link performance has been studied by calculating the DSNR and link margin for wavelengths of mid and far infrared regions, so as to find out the validity of popular myth that performance of FSO systems improves with selection of longer wavelengths. Although most of the FSO systems...
Design and analysis of a Nonlinear Photonic Crystal Fiber having low confinement loss, low birefringence and low effective mode area has been presented using COMSOL Multiphysics software. The suggested design has a central hole filled with Nematic Liquid Crystal (NLC) surrounded by air holes and a Perfectly Matched Layer (PML). Results show that by using circular holes of small diameter and materials...
This paper proposes a modified and simple method for high capacity Steganography in case of color images. This algorithm is usually based on wavelet fusion technique which was not attempted for color images and it proves to be a simplest method than other techniques or algorithms for color images. Even though it uses transform domain technique which only provides robustness against attacks and eavesdropping...
A new method for Discrete Gyrator Transform (DGT) based image encryption and decryption using Double Random Phase Mask (RPM) is proposed. In the present work encryption and decryption has been done using Gyrator Transform (GT) a kind of discrete algorithm using convolution operation. The proposed method uses DGT to reduce the computational load. The robustness of the proposed algorithm to blind decryption...
Here, we designed a highly nonlinear and low loss Photonic Crystal Fiber (PCF) structure with square lattice using COMSOL multiphysics. Propagation properties of proposed PCF has been analysed. The analysis has been carried out using finite element method. The proposed fiber obtained low confinement loss, minimum dispersion for wide range of wavelength. Results shows that the proposed PCF gives large...
Photonic Crystal Fibers (PCFs) are a new class of optical waveguides which offer exceptional light guiding mechanism and deliver significantly improved performance compared to conventional optical fibers. In the present investigation, we propose an solid core PCF for three different values of air filling fraction. The proposed PCF is simulated by using COMSOL Multiphysics. The nonlinearity of proposed...
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