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Considering the recent increase in the frequency of wireless communications, we have developed a spectrum measurement system in the 140–315 GHz range. The measurement system has a low spurious response by pre‐selector over the whole band. For application, we measured radiation patterns emitted from a horn antenna, and the result shows that the measurement system is applicable to EIRP (equivalent isotropic radiated power) measurement of transmitters.

We propose a novel method using an optical loop system to expand the span of an optical frequency comb. The validity of this system was confirmed experimentally in the 1.5 µm wavelength region. By using this system, the modulation index was doubled.

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