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Bragg diffraction by an electrically induced and controlled grating composed of periodically inverted domains in a lithium niobate crystal is discussed theoretically and experimentally. As the applications of the Bragg-diffraction grating, experimental results of an optical switch with one input port and six output ports and a wide band optical amplitude modulator for a violet-blue light with the wide frequency bandwidth from direct current to 1 GHz are presented. © 2000 American Institute of Physics.