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A terahertz (THz)-wave interferometer was devised for measurement of the THz-wave phase shift. In this measurement system, the relative phase shift is deduced from the interference between the THz waves generated by two photomixers. Experimental results with this interferometer revealed that the semiconductor phase modulator could be used as a THz-wave phase shifter by utilising its chromatic dispersion.
We devised a phase stabilization technique at optoelectronic carrier generation applicable for the future THz wireless coherent transmission. Based on a 1-Gbit/s data transmission with a 12.5-GHz carrier signal, we demonstrate for the first time that our technique using a Mach-Zehnder interferometric configuration is effective not only for on-off keying signals, but also for phase-shift keying signals.
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