Abstract

Fabry–Perot resonators have been used to enhance nonlinear effects and to produce practical nonlinear optical devices. We have shown that the nonlinear properties can be increased further, and novel switching devices are possible by using an integrated-optics side-coupled resonator. In this structure a waveguide resonator, filled with nonlinear or electro-optic material and terminated with Bragg gratings, forms a directional coupler with an adjacent waveguide. Optical intensity or applied voltage pulls the Fabry–Perot into resonance by changing its optical length and the phase of the coupling coefficient, while at the same time changing the magnitude of the resonator coupling. The device is similar in construction to the linear resonant optical reflector (ROR) that is used for linewidth narrowing of semiconductor lasers.¹

© 1990 Optical Society of America