We propose a series of integrated Bragg grating filters with performance enhancement via the concept effective medium. The bandstop are built in high-resistivity silicon wafer and operated over WR-3.4 band (220–330 GHz) in-plane polarization. proposed designs use an additional degree freedom controlling refractive index so as to fully potential structures. As result, high insertion loss typical...

We present a new application of the acousto-optic superlattice modulation of a fiber Bragg grating based on the dynamic phase and group delay properties of this fiber-optic component. We demonstrate a tunable photonic true-time-delay line based on the group delay change of the light reflected from the grating sidebands. The delay is electrically tuned by adjusting the voltage applied to a piezo...

We report the first ever demonstration of a wavelength-locked Alexandrite laser using volume Bragg grating (VBG) as wavelength-selective mirror. Output power 3.3 W with diffraction limited beam quality M2=1.1 was obtained at lasing wavelength 762.2 nm and linewidth (FWHM) 2.5 GHz.

In the quest of finding the ideal polymer optical fiber (POF) for Bragg grating sensing, we have fabricated and characterized an endlessly single mode microstructured POF (mPOF). This fiber is made from cyclo-olefin homopolymer Zeonex grade 480R which has a very high glass transition temperature of 138 °C and is humidity insensitive. It represents a significant improvement with respect to the a...

We present a flexible and rapid method for the production of Bragg gratings in a range of optical waveguides such as optical fibres and direct laser-written waveguides in bulk media. Using a low repetition rate (1 kHz) femtosecond laser, Bragg grating structures can be written in a point-by-point fashion (where each laser pulse inscribes one period of the Bragg structure) in both passive and ac...

we solve the coupled mode equations governing the chalcogenide nonlinear fiber bragg gratings (fbgs) numerically, and obtain the bistability characteristics. the characteristics of the chalcogenide nonlinear fbgs such as: switching threshold intensity, bistability interval, on-off switching ratio are studied. the effects of fbg length and its third order nonlinear refractive index on fbg charac...

A modified coupled-mode (CM) model is proposed for the optical behavior of thermally chirped Bragg gratings. The model accounts for the axial gradient in the modulation wavenumber, which has been ignored in the classical CM model. The model is used to characterize the optical behavior of a polymethyl methacrylate-based polymer Bragg grating subjected to nonisothermal conditions. The validity of...

All-fiber lasers offer increased robustness and simplicity over other fiber laser systems. Current active Q-switching techniques for all-fiber lasers rely on electro-mechanical transducers to strain-tune an intra-cavity fiber-Bragg grating, which adds complexity and can lead to vibrational sensitivity. An all-optical technique for achieving active Q-switched operation is a more elegant approach...

Title of Thesis: DETERMINATION OF ROUND EXIT VELOCITY USING FIBER BRAGG GRATING SENSORS Degree Candidate: Arvind Ramaswamy Aiyar, Degree and Year: Master of Science, 2004 Thesis Directed By: Professor Christopher C. Davis Department of Electrical & Computer Engineering Optical fiber sensing technology has found widespread applications in smart structures and intelligent engineering systems. In ...