Study On Slow Light Via Stimulated Brillouin Scatting In Optical Fiber

The generation of slow light can solve the the most important problems in all-optical communication network: optical switching and optical buffer. The pursuit of the very slow light speed in the medium has become the hotspot in the current research in the field of the optics information.In many technologies of the generation of slow light, the slow light in optical fiber has been caused great concern for the large relatively time delay and the compatibility with optical devices. This dissertation focuses on the study of slow light via stimulated Brillouin scattering (SBS) and optical parametric amplification (OPA) in optical fiber. The contents are as follows: 1. The background and the fundamental of slow light in optical fiber and an overview of the various technologies are introduced. The relationship between kinds of speed and dispersion are analyzed as well as the effect of Kramers-Kroning relation to the group velocity. The threshold and saturation of stimulated Brillouin scattering is theoretically discussed too.2. The phenomenon of slow light based on SBS is studied. The relationship between the pulse delay, broading and gain of different input pulse width has been analyzed by numerical simulation.The effect of gain saturation to the pulse delay time has been discussed too. According to the numerical simulation results, the numerical experiment is carried out: the time delay and duration of the output pulse with different gain are measured. To get larger time delay without gain saturation, the fiber concatenation system is used.3. Slow light via SBS for short pulse and broadband pump are studied. The slow light effect of short pulse under CW pump has been compared with that under broadband pumps by numerical simulation, as well as the evolution of different duration short pulses for different modulation broadband pumps. Meanwhile the slow light effect of the picoseconds pulse is studied through numerical experiment.4.The basic theory of slow light based on optical parametric amplification is introduced. The impact of fiber length, pump power and fiber parametric gain on time delay is simulated by numerical methods.