Fiber Four-wave Mixing-based All-optical Multicast Research

Optical multicasting is considered as one of the key technique in future optical networks. Optical multicasting can be obtained by converting the optical data signal to the electrical domain and using multiple transmitters. However, this requires costly high-speed electronics so that all-optical multicasting is much more useful.Firstly, the thesis makes an introduction of the current researches on multicasting, ways to realize multicasting, and makes an analysis the pros and cons of each method. Based on the cascaded Four wave mixing (FWM) in optical fiber, a theoretical method is proposed to realize multicasting, which realizes the multi-channels multicasting with just two lasers in theory.Secondly, we realize the multicasting with pump of continuous and pulse light, according to the new theoretical method we propose. In the continuous light experiment, the homemade module-locked pulse fiber laser is used as the source, which generates more than six transformed lights. Two of then clearly duplicate the information of the signals, successfully recombining two channels, and leading to the effect of pulse compression simultaneously. In the pulse-light experiment, about 20 transformed lights is generated, three transformed lights are detected to duplicate the information, with the conversion from nonreturn-to-zero (NRZ) to return-to-zero(RZ)The advantages of this experiment include: 1) the experimental setup is relatively simple; 2) the power of the multicasting is relatively constant, and the wavelength is adjustable; 3) there is the potential capability of increasing the number of channels; 4) this technique has application in the recombination of phase-shift keying format.