Study On Optical Parametric Amplification In Optical Fiber

Fiber optical parametric amplification (FOPA) is a new type amplification method based on one of higher order nonlinear effects, four-wave mixing (FWM) in fibers. It needs one or two laser as the pump source, the optical fiber as the nonlinear gain medium to make the signal light be amplified. FOPA has not only advantages such as high gain, large bandwidth, low noise, etc., but also has fast response rate for the modulation and signal transparency, can generating idler efficiently and so on. On account of the above characteristics, FOPA is wide range applied in the optical signal amplification, all-optical signal processing, wavelength conversion and so on, especially plays a pivotal role in next-generation high-speed, high-capacity optical fiber transmission network. It is received widespread attention, as a research hot spot issue on optical fiber communication technology in recent years.This thesis is around the features of FOPA and on basis of summing up abroad existing research work. It researches on properties in the FOPA effects arising from fibers from basic theory which are focusing on simulation and experimental aspects. The main work as follows,1. Overviewed the basic principles of FOPA and the main structure, summed up the research results and current research of foreign scholars and research teams on FOPA.2. Described the basic mechanism of Four-Wave Mixing and nonlinear coupled mode equations, analyzed the phase matching condition, given the phase matching relationship and the impacting factors of amplification efficiency in a single pump fiber parametric amplification.3. According to requirements for the nonlinear medium in FOPA and combined with properties of bismuth, designed photonic crystal fiber based on bismuth oxide (Bi-PCF) which was suitable for FOPA. After that, its dispersion, nonlinearity and the effective cross-sectional area and other characteristics were analyzed. Consequently, it was used as a nonlinear medium for FOPA simulation by these parameters. Meanwhile, an equal length Silica based photonic crystal fiber (SiO2-PCF) was used for the experimental studies. Then, comparison about the impact in gain characteristics of FOPA between them was analyzed.According to background theory described before, an experimental platform was built. Stimulated Brillouin Scattering (SBS) characteristics used different types of fiber was experimental studied. Phase Modulation method was employed to suppress their SBS. Subsequently, the SBS threshold was increased and improved the FOPA gain. The experiment of FOPA adopting the high nonlinear fiber as the nonlinear medium under the conditions of single-pumped was also studied. At last, the gain, bandwidth and other characteristics from the results were got, and their impacts were compared.Finally, this thesis summarizes the work. It also puts forward some improvement program, the need to improve and further work.