Photonic generation of sub-terahertz noises and its application to spectroscopy measurement

Abstract

We present a photonic technique for generating subterahertz noise with an optical amplifier, arrayed waveguide grating (AWG), and uni-travelling carrier photodiode (UTC-PD). This scheme provides a high noise level and good controllability of the noise level and frequency band. The power density of the generated sub-terahertz noise is approximately -130.1 dBm/Hz at 350 GHz, which is 43.9 dB higher than the thermal noise (-174 dBm/Hz). Utilizing the implemented sub-terahertz noise generator with an UTC-PD module, we measured the absorption lines of N