Fig. 1: Photonic generation and distribution of RF signals at the VLBI radio telescope. | Light: Science & Applications

Fig. 1: Photonic generation and distribution of RF signals at the VLBI radio telescope.

From: Optical frequency comb integration in radio telescopes: advancing signal generation and phase calibration

Fig. 1: Photonic generation and distribution of RF signals at the VLBI radio telescope.

Schematic of the demonstrated photonic system that delivers H-maser-locked optical pulses from the observatory building to the antenna room to generate RF-LO and RF-comb signals for downconversion and phase calibration at the VLBI receiver. EDFA Erbium-doped fibre amplifier, EOS-TD electro-optic sampling-based timing detector, FM Faraday-rotating mirror, OFC optical frequency comb (40-MHz mode-locked Er-fibre laser comb), O/E optical-to-electrical conversion, PI proportional-integral servo controller

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