Hi,
As Millimeterwave photonic systems represent a well-suited approach to such broadband
wireless communications because of the large bandwidths that can be supported,
the favorable propagation characteristics of millimeter-wave radiation, and the ability
to remote broadband signals over long distances in optical fiber.
The millimeter-wave (MMW) region of the electromagnetic
spectrum refers to wavelengths on the order
of 1–10 mm, or the frequency range of 30–300 GHz.
MMW technologies have long been used for military
applications, such as radar and missile guidance,1 as
well as scientific purposes, such as radio astronomy
and spectroscopy.
As We have several techniques to generate optical MMW signals based on LDs at over 100 GHz. The simplest way is the optical heterodyne mixing using two distributed feed-back (DFB) lasers with narrow linewidth (<100 kHz). Uni-traveling-carrier photodiode,UTC-PD which utilizes only electrons as active carriers, provides both a large bandwidth and a high-saturation output current at 1.55-mm wavelength.
Thanks,