Investigation On Characteristics Of Fiber Optical Parametric Amplifiers Based On Photonic Crystal Fibers

Recently, Fiber Optical Parametric Amplifier (FOPA) has attracted tremendous attention. FOPA based on highly efficient Four Wave Mixing (FWM) has large flexibility and can provide amplification beyond the gain spectrum of erbium-doped optical fiber amplifier (EDFA). As the working medium of FOPA, photonic crystal fiber (PCF) provides lots of advantages compared to traditional fiber, which can be used to generate high parametric gain with wideband and low noise.At the beginning of this dissertation introduces the basic principles of optical guide, physical characteristics and its potential applications in optical communications. Then introduces the FOPA theory, establishes a theoretical model, and solves the nonlinear coupled wave equations under special condition. Based on the theory, we analyses the one-pump and dual-pump FOPA characteristics of gain and bandwidth, dependent on power pump, nonlinear coefficient, fiber length, pump wavelength and dispersion slope. After that, we do research about the input signal power, signal wavelength, pump separation, fourth-order dispersion impact on the noise figure of dual-pump FOPA.Fiber dispersion varies randomly along the fiber length in PCF due to the technology of fabrication, which lead to changes in gain spectrum. This dissertation numeral analysis FOPA with zero-dispersion varies in reality situation. The result shows that it is necessary to reduce the gain bandwidth to retain the gain uniformity.