The First Radioastronomical Observation with Photonic Local Oscillator

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Abstract

We present the results of experimental radioastronomical observations of an interstellar molecular spectral line with an SIS (superconductor-insulator-superconductor) receiver pumped by a photonic local oscillator (LO). A millimeter-wave LO signal was generated by feeding an optical comb signal into a W-band (75-110 GHz) photomixer using a uni-traveling-carrier photodiode (UTC-PD). A CS J = 2-1 line at 98 GHz was observed toward a high-mass star-forming region W 51 (H2O). We compared the obtained spectra with those obtained with a conventional Gunn oscillator as an LO. As a result, the line parameters, such as the width, intensity, and frequency, were consistent with each other. The results presented here show that the photonic LO is a very promising source for heterodyne receivers in millimeter- and submillimeter-wave astronomy.

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Takano, S., Ueda, A., Yamamoto, T., Asayama, S., Sekimoto, Y., Noguchi, T., … Nagatsuma, T. (2003). The First Radioastronomical Observation with Photonic Local Oscillator. Publications of the Astronomical Society of Japan, 55(4). https://doi.org/10.1093/pasj/55.4.l53

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