Study Of Novel Fiber Optical Parametric Oscillators

In the past several years, fiber optical parametric amplifiers (FOPAs) have attracted considerable attention due to their remarkable features, such as high gain, large gain bandwidth, arbitrary waveband operation, ultra-fast response, multi-channel signal amplification and so on. These significant features make FOPAs have incomparable in the implementation of novel fiber lasers. This thesis focuses on the research of gain properties of fiber optical parametric amplification and its application in realizing various fiber optical parametric oscillators (FOPOs), which include tunable FOPOs, multi-wavelength FOPOs, Fourier domain mode locking FOPOs.To begin with, the history and the research progress of FOPAs and FOPOs are introduced, as well as the development trend of FOPOs research.Then, based on the study of the coupled amplitude equations of four-wave mixing in optical fibers, the theory model of fiber optical parametric amplification is established and a simulation is carried out. According to the analysis of simulation results, effects of parameters such as the dispersion and nonlinear characteristics of gain fiber, the center wavelength and the power of pump lights on fiber optical parametric amplification are investigated, which provide a theoretical reference for subsequent works.Subsequently, tunable fiber lasers based on fiber optical parametric amplification are investigated. A simple line cavity tunable FOPO and a switchable and tunable FOPO are proposed. The principle of wavelength switching and tuning of the FOPOs is introduced.Furthermore, multi-wavelength FOPOs are developed. Comb filter technology used to realize the multi-wavelength fiber laser is introduced. We present a single-pumped multi-wavelength FOPO using a Sagnac fiber loop filter as the comb filter. A single-pumped multi-wavelength FOPO with a tunable wavelength spacing based on Mach-Zehnder interferometer (MZI) is proposed and multi-wavelength lasing with a wavelength spacing of0.08nm is demonstrated. We also propose a double-pumped multi-wavelength FOPO with a switchable wavelength spacing employing a Sagnac fiber loop filter as the comb filter and a wavelength spacing tunable double-pumped multi-wavelength FOPO based on MZI. The advantages of fiber optical parametric amplification in realizing multi-wavelength fiber lasers are demonstrated. Finally, Fourier domain mode locking FOPO is investigated. The research background, the significance of Fourier domain mode locking fiber laser and the advantages of fiber optical parametric amplification in realizing FDML fiber laser are introduced. The concept and the operation principle of Fourier domain mode locking and spectrum-limited Fourier domain mode locking are described. We propose a double-pump Fourier domain mode locking FOPO and a spectrum-limited Fourier domain mode locking FOPO which can be applied in sensing system.This experimental research-based thesis, supplemented by theoretical simulation research, aims to investigate the gain properties of fiber optical parametric amplification and its application in realizing novel FOPOs. I believe that this thesis will be of great significance for the development of advanced FOPOs technology and their applications.