Investigation of Stimulated Brillouin Scattering for the Generation of Millimeter Waves for Radio over Fiber System

Radio over fiber (RoF) is a promising technique in providing broadband wireless access services in the emerging optical-wireless networks. Optical millimeter-wave (mm-wave) generation is a key technique to realize low cost and high transmission performance in the RoF systems. Several techniques have been proposed for the optical generation of mm-waves such as direct modulation, external modulation, optical heterodyning and so on. However, in this work we proposed and investigate an alternative to above mention methods, which is based on stimulated brillouin scattering (SBS) in an optical fiber. SBS technique was designed and modeled by performing CW laser in a single mode optical fiber (SMF) through optical Mach-Zehnder modulator (MZM) with two pump lasers for amplification purposes. The analysis was done by determination of the power depletion of generated stokes caused by the combined effect of dispersion, fiber attenuation and nonlinear fiber effects; i.e. self-phase modulation (SPM) and SBS. SBS performance with the optical fiber loop length up to 100 km was analyzed. It has been shown that SBS power is depends on the fiber loop length which is higher and lower at certain length due to natural properties of the fiber. The design shown the RF generation was achieved at 40 GHz.