Abstract
Wireless communication using a pulse amplitude modulation signal was carried out in the 300 GHz-band. In this investigation, the used THz-wave signal was generated with a silica waveguide-type optical signal emulator and high-speed photo-mixing. The optical signal emulator consisting of a tunable asymmetric Mach-Zehnder interferometer produces an optical pulse amplitude modulation signal from an optical on-off keying signal by partly adopting lightwave interference. 25 Gsymbol/s three and four-level pulse amplitude modulation signals in the 300 GHz-band were generated and used for the wireless communication. Bit error rates of received signals were evaluated with off-line processing, and the bit error rates were estimated to be 1.9 × 10−4 and 8.0 × 10−3 in the communications using the three and four-level signals, respectively.
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