Efficient analytical and computational techniques for design and analysis of wave propagation in Optical Fibers, Integrated Optical Waveguides & waveguide devices, Methods to extract optical fiber characteristics from fiber measurement data. Analysis and design of coupled optical waveguide devices and waveguide devices with absorbing or metal layers. Analysis, modeling and design of Erbium doped Optical Fibers EDF and waveguides for optical amplifiers. Analysis of Long Period Gratings (LPG) in Erbium doped fibers leading to a novel concept of use of LPGs written in EDF for efficient gain equalization and ASE noise reduction. Analysis, design and realization of Optically Controlled Microwave Devices. Design of practical integrated optical components and circuits on Lithium Niobate substrates.