Optical generation of millimeter-wave (mm-wave) is very attractive for the applications such as radio-over-fiber for wireless communications, imaging, and radio astronomy observations. The optical generation of mm-wave signal employing Double-sideband with Carrier Suppression (DSBCS) modulation using a single-electrode Mach-Zehnder Modulator (MZM) is theoretically analyzed. The impact of the finite Extinction Ratio (ER) of MZM on the generated mm-wave signal is discussed. An experimental setup using a single-electrode MZM based on DSBCS modulation is built. A stable millimeter-wave signal tunable from 46 to 60 GHz with less than 1.5 dB power variation is obtained by tuning the electrical driving signal from 23 to 30 GHz.