Multi-frequency THz reference source by spectral synthesis of optical combs for simultaneous phase-locking of THz sources

摘要

For simultaneous stabilization of a set of cw-THz source devices oscillating at different frequencies, a number of frequency reference sources are required. In this paper, we propose a multi-frequency reference source based on Mach-Zehnder-modulator-based flat comb generator (MZ-FCG) combined with a programmable optical filter (POF). An optical comb generated by the MZ-FCG was spectrally-synthesized by the POF. By photomixing of the synthesized comb modes using a high-speed photodiode, multi-frequency THz waves are generated. As a preliminary experiment, generation of multi-frequency THz wave in the W-band has been demonstrated.