In the new generation of ultra-speed fiber communication systems, the combination of optical time division multiplexing (OTDM) and wavelength division multiplexing (WDM) technologies are the trends of optical network in coming future, thus the researches on components will be of great scientific interest. As the key technology in the OTDM and WDM systems, Er3+/Yb3+ co-doped ultra-short pulse laser sources become an increasing concern. Multimode pump laser can be effectively coupled into double-clad fiber by using pump coupling technologies, which will improve the conversion efficiency of the photo-photo and reducing costs, and make it possible to construct high power ultra-short pulse fiber laser.This thesis focuses on theoretical and experimental studies of ultra-short pulse fiber laser sources, including:I, On the basis of comprehensive references, the development histories of laser and fiber laser were reviewed, and the research actuality, the trend of development, the advantage and the application of fiber laser were summarized.II, The configurations of double-clad fiber were introduced, and the absorption characteristics of some inner claddings of double fiber were analyzed by the methods of Two-dimension analyses and Three-dimension ray tracing.III, Some cladding pumping coupling technologies were introduced, the superiorities and deficiencies of various technologies were compared, and the criterions for choosing technologies in practice were analyzed.IV, The technologies of ultra-short pulse in fiber lasers were introduced in detail, the main principle of these technologies was analyzed, and the characteristics of pulses produced by technologies were discussed.V, The principle of Er3+/Yb3+ co-doped fiber were analyzed. By the mechanism of nonlinear polarization rotation(NPR), we obtained the single soliton mode-locked pulses, passively harmonic mode-locked pulses, Q-switched mode-locked pulses, and Q-switched pulses in a passively mode-locked all-fiber soliton laser. |