40 dB dynamic enhancement of modulation depth for optically carried microwave signals

Stimulated Brillouin scattering for optical single sideband modulation in RoF system

“…The modulated signal is launched into a 25km single mode fiber (Corning SMF-28) and interacts with the seed wave feedback from the circulator. Due to the feedback of the Stokes wave, the SBS threshold becomes more lower than that in a single-pass fiber [11]. The power of modulated signal launched into fiber is about 3.3 mW which is larger than the SBS threshold of 2mW.…”

High-efficiency single-frequency Brillouin fiber laser with a tunable coupling coefficient

“…SBS has been demonstrated [8][9][10][11] to be an appropriate mechanism for selectively filtering the excess optical carrier. In particular, recent publications have shown that the single-frequency operation of an efficient Brillouin fiber laser permits as much as 40-dB depletion of the optical carrier 16 while the quality of the rf signal is maintained in terms of phase noise.…”

Photonic‐assisted microwave amplification using four‐wave mixing

“…Non-linear effects have not been vastly investigated for microwave photonics up to the moment, thus there are just few works published in the literature concerning the interplay between these two areas. For instance, stimulated Brillouin scattering (SBS) and self-phase modulation have been used in RoF systems to improve the modulated signal sidebands [6,7]. On the other hand, Wall and Foster have proposed the use of partially degenerated four-wave mixing (FWM) non-linear effect to obtain RF gain in RoF systems [8].…”