Title :
Photonic local oscillators for millimeter- and submillimeter-wave receivers
Author :
Ishiguro, Masato
Author_Institution :
Nat. Astron. Obs. of Japan, Tokyo, Japan
Abstract :
In this paper a new scheme called "photonic LO", in which the LO signal can be generated with a photodetector by mixing two optical signals differing in the frequency by the required LO frequency is described The photonic LO can greatly simplify the LO system in a large radio interferometer system such as Atacama large millimeter-submillimeter array (ALMA). A comparison of receiver noise temperature of the superconductor-insulator-superconductor mixers(SIS) mixer pumped by a Gunn oscillator LO and a photonic LO is demonstrated. Photonic LO system used for spectroscopic observation is conducted using Nobeyama 45-m telescope is analysed.
Keywords :
Fourier transform spectroscopy; light interferometry; millimetre wave receivers; optical noise; optical pumping; oscillators; photodetectors; radiotelescopes; submillimetre wave receivers; superconductor-insulator-superconductor mixers; 45 m; ALMA; Atacama large millimeter-submillimeter array; Gunn oscillator; Nobeyama 45-m telescope; SIS mixer; millimeter-wave receiver; optical signal; photodetector; photonic local oscillator frequency; photonic local oscillator signal; radio interferometer system; receiver noise temperature; spectroscopic observation; submillimeter-wave receiver; superconductor-insulator-superconductor mixers; Frequency; Local oscillators; Optical arrays; Optical mixing; Optical noise; Optical receivers; Photodetectors; RF signals; Signal generators; Superconducting device noise;
Conference_Titel :
Lasers and Electro-Optics Society, 2003. LEOS 2003. The 16th Annual Meeting of the IEEE
Print_ISBN :
0-7803-7888-1
DOI :
10.1109/LEOS.2003.1253149
