Photonic‐assisted microwave amplification using four‐wave mixing

Brillouin Effect Impact in RoF Systems with Photonic-Assisted RF Amplification

“…According to the literature, Wall and Foster reported microwave amplification in A-RoF systems using FWM and reported 9 dB photonics-based RF gain for frequencies up to 14 GHz [20]. Our research group has intensely contributed to this topic in the last years [21][22][23][24][25], attaining world records in terms of maximum photonics-assisted RF gain of 27 dB and widest bandwidth up to 50 GHz. Particularly in [21] and [22], we have demonstrated the physical mechanism behind PAA, which not only due to the FWM effect, but also to the modulation sidebands enhancement.…”

“…On the other hand, nonlinear optics can be properly exploited to bring benefits for optical-wireless systems, mainly in the microwaves and mm-waves bands [18] [19]. Particularly, FWM has been demonstrated useful for enabling photonic-assisted RF amplification (PAA) in A-RoF systems [20][21][22][23][24]. PAA consists of increasing the photodetected electrical power without requiring electrical amplifiers or high-power photodetectors (PDs).…”

“…Our research group has intensely contributed to this topic in the last years [21][22][23][24][25], attaining world records in terms of maximum photonics-assisted RF gain of 27 dB and widest bandwidth up to 50 GHz. Particularly in [21] and [22], we have demonstrated the physical mechanism behind PAA, which not only due to the FWM effect, but also to the modulation sidebands enhancement. Afterward, the PAA technique has been improved and experimentally evaluated as a function of diverse parameters and figures of merit, as following [23] [24]: pump wavelength spacing, polarization voltage (Vbias) of a Mach-Zehnder modulator (MZM); RFdriven signal level; signal-to-noise ratio (SNR); phase noise; root mean square error vector magnitude (EVMRMS); spuriousfree dynamic range (SFDR); temperature variation.…”

A Comprehensive Study on Phase Sensitive Amplification and Stimulated Brillouin Scattering in Nonlinear Fibers with Longitudinally Varying Dispersion

“…The differential equations governing the evolution of the signal and the two pumps are Equation (7) and Equation ( 8) respectively. Setting α = 0 in Equation ( 8) and considering the two pumps to be undepleted along the length of the DOF, their slowly varying complex amplitudes denoted by A ±1 are given by:…”

“…This attribute of noiseless amplification of PSAs have attracted recent attention in terms of their potential applications in a variety of domains such as microwave photonics, all optical signal processing, longhaul optical communication, free-space satellite communication, quantum technologies, etc. to name a few [5][6][7][8][9][10]. Recent progresses in the field have led to exploration of unconventional fiber designs in terms of the longitudinal variation of the fiber dispersion along the fiber length for system performance enhancements in diverse fiber-optic application platforms [11][12][13][14].…”