Laser diodes convert microwaves to optical signals

Researchers from the University of Glasgow (Scotland), A. F. Ioffe PhysicoTechnical Institute (St. Petersburg, Russia), and the University of Kassel (Germany) have used a modelocked semiconductor laser as a mixer to u¥and downconvert applied microwave signals to optical signals. By combining a twosection laser (gain region and saturable absorber modulator) and optical power amplifier, a highfrequency signal can be transmitted, resulting in a socalled fiberradio. Fiberradio technology is curr

Jan 1st, 1995

Researchers from the University of Glasgow (Scotland), A. F. Ioffe PhysicoTechnical Institute (St. Petersburg, Russia), and the University of Kassel (Germany) have used a modelocked semiconductor laser as a mixer to u¥and downconvert applied microwave signals to optical signals. By combining a twosection laser (gain region and saturable absorber modulator) and optical power amplifier, a highfrequency signal can be transmitted, resulting in a socalled fiberradio. Fiberradio technology is currently being developed by a number of telecommunications companies. According to the researchers, the key to accessing ultrahigh frequencies is to generate a localoscillator (LO) signal and to use it in a mixer. To date, optoelectronic mixers have only provided output as an electrical signal; these experiments demonstrate that mixing can be performed optically.

Temperature and wavelength changes tailor terahert¥emission from InSb

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