Abstract
Abstract : Methods for multimode optical beam expansion, deflection, and switching are discussed in connection with fiber optic and optical signal processing applications. The feasibility of using negative waveguide lenses as beam expanders for stripe-geometry lasers is demonstrated. A monolithically integrated laser source and beam expander is designed utilizing planar epitaxy and selective chemical etches. Epilayer designs for optical coupling of light from the laser region to the waveguide are discussed. Grating distributed Bragg deflectors are fabricated, and the beam expansion from them is characterized. The use of electrical feedback is produce bistability in an optical switch in both bulk LiNbO3 and LiNbO3 waveguides is demonstrated, and the transient response of these hybrid bistable optical devices is investigated. Theoretical predictions of the dependence of switching time on applied light increment are confirmed. (Author)
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