Abstract
In this thesis, we study the applications of optical code division multiple access and passive optical network for access network. The content of optical code division access applications is the realization of generating optical short pulse using gain-switched Fabry-Perot laser diode to replace the previous structure using two Mech-Zender modulators. We also construct a novel optical code division multiple access encoder to verify if the proposed light source is feasible in OCDMA system. The content related to passive optical network applications includes WDM-PON: a star-ring-bus architecture for WDM fiber-wireless system with self-healing function, and Ethernet PON: a multi-service access network with self-healing function and local area network emulation. Besides, we experimentally realize a tunable dual-wavelength and a multi-wavelength fiber ring laser. Finally, we provide a long distance fiber Bragg gratings sensor system to detecting fiber fault in access network. These investigations and demonstrations will be useful in the field of communication systems.