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300-GHz multilevel signal transmission over optical fibers and air is demonstrated using advanced optical communication technology including optical frequency comb generation. Local oscillator signal transport over optical fibers to optical-terahertz converters removes the need for setting any terahertz-capable oscillators in the converters. This fiber-remoted configuration with seamless conversion...
We demonstrate 12-Gbaud QPSK signal transmission in a fiber-wireless link and compare a modulator-based optical two-tone generator and an optical heterodyning with free-running lasers. The obtained frequency fluctuation of the two-tone system meets the requirements of the radio regulations.
An Mth power-law phase estimator using the Su-Wong-Ho filter; the optimal linear filter for symmetric Lévy-process phase noise, is proposed for optical M-PSK receivers, and is demonstrated experimentally in 20Gbps optical QPSK transmissions.
The wavelength-shift-free optical phase conjugation technique using orthogonal pumps is verified experimentally via the coherent detection technique. 20Gbps optical QPSK signal and its conjugate are simultaneously demodulated as a polarization-multiplexed signal.
We demonstrate W-band (75–110 GHz) RoF radio signal transmission with two free-running lasers using an optical heterodyne technique. The combination of a laser located at a base station for the optical local oscillator and a data-modulated optical signal from a central office provides a W-band radio signal. The carrier frequency offset fluctuation within 6 MHz can be mitigated by digital signal processing...
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