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Springer theses

Generation of Local Oscillator Signal via Photomixing

Book-Kok Tan

Published Sep 15, 2015• 0 citations
Publisher
DOI
10.1007/978-3-319-19363-2_9

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An optical–microwave conversion system has been proposed as a high-stability oscillator in the microwave and millimetre-wave frequency region. A photomixer with heterodyne mixing of two lasers was applied to generate electromagnetic waves and a high-TC grain boundary Josephson junction detector was used to monitor the frequency of the electromagnetic waves in real time. We described the system in detail; it employed a sealed optical connector to introduce the optical signal directly into the cryostat.

Superconductor Science and Technology•Jun 5, 2004•5 citations
We have developed a waveguide-mounted photomixer in the 75-115 GHz band with a uni-traveling carrier photodiode which is optically-pumped by two 1.55-gm lasers. We have suc-cessfully demonstrated to produce an output power of,2 rnW at 100 GHz with an input laser power of-400 mW. An SIS mixer has been pumped by the photomixer as a local oscillator. It is found that in this configuration the photomixer can provide a sufficient local oscillator power required for optimum operation of the SIS mixer in the frequency band from 85 to 110 GHz. We have carried out similar experiment using a Gunn-diode local oscillator source and carefully compared the receiver noise temperature of the SIS mixer with those pumped by the photomixer. It is found that the receiver noise temperatures of the SIS mixer pumped by the photomixer is a little higher than those pumped by the Gunn oscillator.
We have fabricated a generation and detection system of photomixing signals using a photomixing technique and a Josephson junction detector. Up to now, an electromagnetic wave generated by a heterodyne mixing of two lasers was emitted from an antenna, and irradiated to a Josephson junction. In this study, we have developed the system, and the photomixing signal was introduced into a coaxial cable and a coplanar wave guide coupled to a Josephson junction. This structure is more suitable for device application since it can easily be integrated into electronic devices. With this system we can clearly observed photomixing signals from 16 GHz to 95 GHz using a uni-traveling-carrier photodiode as a photomixer as well as signals in the range of 14 GHz to 50 GHz using an InGaAs PIN photodiode.
An optical–microwave conversion system has been proposed as a high-stability oscillator in the microwave and millimetre-wave frequency region. A photomixer with heterodyne mixing of two lasers was applied to generate electromagnetic waves and a high-TC grain boundary Josephson junction detector was used to monitor the frequency of the electromagnetic waves in real time. We described the system in detail; it employed a sealed optical connector to introduce the optical signal directly into the cryostat.