A numerical analysis of a hexagonal PCF structure with four circular air hole rings around the core has been presented in this paper. By utilizing a full vectorial finite element method with perfectly matched layers, propagation properties such as birefringence, chromatic dispersion and confinement losses are numericaly evaluated for the proposed PCF structure. Specifically, birefringence of 2.018 × 10–2, nonlinear coefficients of 40.682 W−1 km−1, negative chromatic dispersion of − 47.72 ps/km.nm at 1.55 µm and − 21 to − 105 ps/km.nm at the telecommunication band of C-U have been reported.

A four-ring microstructure photonic crystal fibre with a descending air hole ring cladding is presented. Numerical analysis of the structure is done using full vectorial finite element method with perfectly matched layer (PML) boundary condition. It is demonstrated that it is possible to achieve at 1.55 µm confinement loss of 2.767 × 10−5 dB/m, birefringence of 0.00346 and a nonlinear co-efficient of 41.77 km−1 W−1. Also, chromatic dispersion realised suggests a tuneable zero dispersion at 0.9–1.1 µm wavelength range.

This work presents photonic crystal fibres made up of four hexagonal shape of four rings. Four structures have been designed and configured. The structures show improvement in optical properties consecutively to achieve the optimum configuration. The full vectorial finite-element method is adopted for this work. COMSOL Multiphysics is used for the simulation. The results show a birefringence of 1.308 × 10−2 at 1.55 µm and tuneable double zero dispersion at wavelengths of 0.99 µm and 1.8 µm for x-polarisation mode. Also, the chromatic dispersion of − 24.062 ps/km nm and nonlinear coefficient of 30.32 W−1 km−1 are obtained at a telecommunication wavelength of 1.55 µm. The proposed photonic crystal fibre can be beneficial in nonlinear and supercontinuum applications since photonic crystal fibres of double zero dispersion demonstrate higher power spectral densities than single zero dispersion.

Health Information System aims at improving and enhancing the delivery of quality, data availability and administrative effectiveness of people’s health. Medical record has come under severe threat as a result of the manual system of medical record keeping in spite of its important functions. This system of record-keeping involves taking down patient data on pieces of paper, which are put into files and kept in cabinets. In fact, this is an improper means of documentation resulting in loss and mismatch of patient data, and time wastage. It is alsocumbersome, bulky and consumes a lot of the office space. In this paper, a complete web-based health information system is designed to solve these problems so as to enable users handle details on policies efficiently and effectively. A test of the system over various network topologies reveals that time taken to move a packet and received acknowledgment for standalone, LAN, WAN and Intranet is 3ms, 4ms, 8ms and 10ms respectively. These short periods of time show faster and efficient delivery of health activities. The Web Based HealthInformation System thus provides significant benefit to institutions as it can capture data and store it in the developed database for future use. Citation: Kwasi, T. M., Patrick, A.A, Amponsah Wellington, A. Design and Implementation of a Web-BasedHealth Information System, 2020; 5(3): 1－11. Received: August 4, 2019Accepted: September 30, 2020

No abstract