Application Of SOA Fiber Ring Laser In Optical Communication System

The fiber ring laser based on Semiconductor Optical Amplifier (SOA) has very important functions in the all-optical network because of simple implementation, multifunction. SOA fiber ring laser (SFRL) can work as ultra-short pulse generator, all-optical data format conversion device, all-optical clock recovery device, multiwavelength laser, microwave signal generator and so on. In this dissertation, theoretical and experimental researches on the filter character, data format conversion, clock recovery base on SFRL are presented. And this work is supported by the Science Fund for distinguished Young Scholars of Hubei province (2006ABB017) and the program for the New Century Excellent Talents in University of Education Ministry of China (NCET-04-0715) and Huawei Science Fund. The main contents and results are listed as follows:(1) The research background and achievements of SOA fiber ring laser are clarified.(2) The theoretical models of the SOA are established. And numerical models of the SFRL is also established.(3) Research signification and achievements of all-optical nonreturn-to-zero NRZ to return-to-zero RZ data format conversion are Clarified. A novel scheme for NRZ to RZ data format conversion without clock signal participation has been proposed for the first time using SFRL. 20Gb/s data format conversion has been achieved in both experiment and simulate, and the influences of the format conversion performance are investigated.(4) We get different RF components pulse output using a 8 bit fixed coding in the experiment of the SFRL. SFRL filter character has been proposed for the first time and the principle has been found out through experiment analysis and simulation..(5) The application of the SFRL used in all-optical clock recovery is researched. Principle of clock recovery is presented by simulation and experiment. Nonreturn-to-zero differential phase-shift-keying (NRZ-DPSK) clock recovery is researched and 20Gb/s NRZ-DPSK clock extraction is obtained in experiments. And the last, we report a new scheme to get better clock quality by adding an all-fiber delay interferometer (DI) to the SFRL, and better clock quality is obtained in the experiment.