Abstract
Optical generation of highly stable millimeter and terahertz waves is proposed and experimentally demonstrated. The optical-fiber-path-induced phase fluctuation is identically transferred to a 40MHz intermediate frequency by using dual-heterodyne phase error transfer, then canceled by a phase-locked loop. Based on the scheme, highly stable signals within the frequency range from 25GHz to 1THz are generated, and the phase jitter is decreased from 2.05rad to 4.7mrad in the frequency range from 0.01Hz to 1MHz. For 1THz, the residual phase noise reaches -60 dBc/Hz at 1Hz frequency offset from the carrier, and the relative timing jitter is reduced to 0.7fs.
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