Photonic Generation of Millimeter-Wave White-Light at $W$-Band Using a Very Broadband and High-Power Photonic Emitter

Photonic chirped radio-frequency generator with ultra-fast sweeping rate and ultra-wide sweeping range

“…Although most of the reported sweeping lasers [16,17] exhibit a narrow static linewidth with a much larger wavelength sweeping range, they may have a very-poor dynamic linewidth (>GHz) during wavelength sweeping. This would result in the wideband MMW white-noise spectra during heterodyne-beating signal generation with optical wavelength sweeping [18]. Thanks to the narrow instantaneous linewidth of our sweeping laser, a clear and repeatable instantaneous MMW waveform can be displayed on the very-fast real-time scope, as discussed latter.…”

Fiber-distributed Ultra-wideband noise radar with steerable power spectrum and colorless base station

“…In practice applications, the chaotic circuits are usually adopted to provide the UWB noise signal in the UWB noise radar [5][6][7]. In order to improve the performance of the UWB noise radar, the noise signal with higher bandwidth generated by photonics-assisted techniques was proposed [8][9][10][11][12][13][14][15]. In 2004, Lin and Liu demonstrated the chaotic-UWB radar where the photoelectricconverted noise signal output from the chaotic operated laser diode with optical injection [8].…”

“…Based on the chaotic dynamics of the laser diode and optoelectronic oscillator (OEO), a series of methods for UWB noise signal generation were proposed since 2010 [9][10][11]. The inherent random of the amplified spontaneous emission (ASE) light source has been utilized to generate the UWB noise signal at almost the same time [12][13][14][15]. Song et al proposed a photonics-assisted technique to produce the UWB noise signal from the microwave to subterahertz region with an ASE light source, optical filter, and photodetector (PD) [12].…”

“…Song et al proposed a photonics-assisted technique to produce the UWB noise signal from the microwave to subterahertz region with an ASE light source, optical filter, and photodetector (PD) [12]. In order to generate the UWB signal with high power density in W-band (75-110 GHz), a near-ballistic uni-traveling-carrier PD was used in the ASE based UWB noise source [13]. In [14], the ASE that is associated with stimulated Brillouin scattering (SBS), namely SBS-ASE, was also used to generate the UWB noise signal.…”

“…Therefore, the generation of a photonic-assisted generation of the UWB signal with tunable notch band behavior becomes a highly significant solution since it can realize dynamic spectrum accessing at the CS according to the real-time environment for avoiding the spectrum-overlay-induced interference [22]. Unfortunately, the power spectra of the photonic UWB noise signal generated by the methods described in [8][9][10][11][12][13][14][15] are difficult to be controlled precisely for complying with the FCC indoor mask and avoiding the spectrum-overlayinduced interference to the NB communication systems. Another issue about the fiberdistributed UWB noise radar is how to implement the wavelength reusing at the BS, i.e.…”