Energy conversion efficiency from a high order soliton to fundamental solitons in presence of Raman scattering

We formulate the energy conversion efficiency from a high-order soliton to fundamental solitons by including the influence of interpulse Raman scattering in the fission process. The proposed analytical formula agrees closely with numerical results of the generalized nonlinear Schrodinger equation as well as to experimental results, while the resulting formulation significantly alters the energy conversion efficiency predicted by the Raman-independent inverse scattering method. We also calculate the energy conversion efficiency in materials of different Raman gain profiles such as silica, ZBLAN and chalcogenide glasses (As2S3 and As2Se3). It is predicted that ZBLAN glass leads to the largest energy conversion efficiency of all four materials. The energy conversion efficiency is a notion of utmost practical interest for the design of wavelength converters and supercontinuum generation systems based on the dynamics of soliton self-frequency shift.Comment: To be published in JOSA

Roadmap on chalcogenide photonics

Alloys of sulfur, selenium and tellurium, often referred to as chalcogenide semiconductors, offer a highly versatile, compositionally-controllable material platform for a variety of passive and active photonic applications. They are optically nonlinear, photoconductive materials with wide transmission windows that present various high- and low-index dielectric, low-epsilon and plasmonic properties across ultra-violet, visible and infrared frequencies, in addition to an, non-volatile, electrically/optically induced switching capability between phase states with markedly different electromagnetic properties. This roadmap collection presents an in-depth account of the critical role that chalcogenide semiconductors play within various traditional and emerging photonic technology platforms. The potential of this field going forward is demonstrated by presenting context and outlook on selected socio-economically important research streams utilizing chalcogenide semiconductors. To this end, this roadmap encompasses selected topics that range from systematic design of material properties and switching kinetics to device-level nanostructuring and integration within various photonic system architectures

Low Cost Wireless Electronic Braille Reader

Electronic Braille readers are getting popular worldwide day by day among the visually disabled people. Bangladesh has over half a million blind people and due to the high cost of the available Electronic Braille in the market, most of these people are unable to take advantage of this technology. To make proper use of this technology, a Servo motor based wireless electronic braille was designed. Currently available servo motor based and piezoelectric based braille have some issues with their mechanical features and price respectively. This paper is about the design and construction of a Wireless Electronic Braille Device with resolved mechanical functionality, wireless data transfer availability and much lower cost than available electronic braille of this type. The proposed design ensures correct mechanical functionality, accuracy, security, faster data transfer and lower cost