Abstract
The interference between two spectral lines of the frequency comb of a fiber femtosecond laser is used to generate millimeter-wave and terahertz tones. The two lines are selected by stimulated Brillouin scattering (SBS) amplification. All other modes are strongly rejected based on polarization discrimination, using the polarization-pulling effect that is associated with SBS. The inherent high spectral quality of a femtosecond fiber laser comb allows generation of millimeter- and terahertz waves with linewidths below 1 Hz, and a phase noise of -105 dBc/Hz at 10 kHz offset. The generation, free-space transmission and detection of continuous waves at 1 THz are demonstrated as well. Lastly, the generated millimeter-wave carriers are modulated by 40 Gbit/s data. The entire system consists of a fiber laser and standard equipment of optical telecommunications. Besides metrology, spectroscopy and astronomy, the method can be utilized for the emergent field of wireless millimeter-wave and THz-communications at ultra-high data rates.
Highlights
Waves in the millimeter (30 - 300 GHz) and Terahertz (0.3 - 3 THz) region of the electromagnetic spectrum have drawn much interest in recent years for several applications
All other modes are strongly rejected based on polarization discrimination, using the polarization-pulling effect that is associated with stimulated Brillouin scattering (SBS)
Spectroscopy and astronomy, the method can be utilized for the emergent field of wireless millimeter-wave and THz-communications at ultra-high data rates
Summary
Waves in the millimeter (30 - 300 GHz) and Terahertz (0.3 - 3 THz) region of the electromagnetic spectrum have drawn much interest in recent years for several applications. In the field of communications, millimeter- and terahertz-waves theoretically enable the wireless transmission of data at rates of up to several Tbit/s, over outdoor links and within data centers. Such data rates would be orders of magnitude higher than those offered by current wireless systems which employ lower-frequency carriers [6]. High-frequency, GaAs-based integrated electronic circuits are available for the generation of sub-millimeter-wave radiation [10]. Their tuning range is restricted to tens of GHz due to the bandwidth of the electrical mixers. Quantum cascade lasers (QCLs) are promising sources for generating radiation at the higher end of the THz spec-
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