Integrated reciprocating optical modulator for optical high-order sideband generation

We demonstrated optical high-order sideband generation using a reciprocating optical modulator consisting of a pair of fiber Bragg gratings and an optical phase modulator. The reflection band of the fiber Bragg grating had a steep edge of 0.02 nm. A twelfth optical high-order sideband component was generated from a 4.4 GHz electric signal. Millimeter waves generated as beat signals of the optical high-order sideband components were quite stable. Spectrum line widths were less than 300 Hz. The intensity modulation of the generated millimeter waves was also demonstrated by applying a baseband signal to the modulator without using another electric or optical modulator.