| With the rapid development of modern information society, the demand on the communication network is increasing. Optical packet switch networks become the trend of the future. All-optical network requires optical signal being transferred and exchanged in optical domain. However, the "Electronic bottleneck" still resists in the communication system, which means that the transmission rate is limited by the switch between electrical and optical signal. This is mainly due to the non-all-optical of the optical buffer technology. Therefore, doing research on the optical buffer technology is of great significance to the realization of all-optical network.This thesis studied the polarization rotation effect of the gain-transparent semiconductor optical amplifier (GT-SOA) as the light switch in the optical buffer, analyzed and simulated of optical buffer system. The basic theory of the gain-transparent semiconductor optical amplifier (GT-SOA), which include cross gain modulation (XGM), cross phase modulation (XPM) and the application of SOA polarization control theory analysis in the optical buffer system are been described in the thesis. The impact of the injection current and the optical power on the refractive index difference between the TE and TM modes has been analyzed. This thesis studied into the structure and principal of the all-optical buffer system, and analyzed the effect of buffer time, signal rate and pattern of signal to system BER. As multi-wavelength system may have more complex problems caused by signal crosstalk, we did further study on the four-wavelength system. We succeed to buffer signal in0.7ms with lOGb/s、20Gb/s rates. We also did some experiments on the system preparation work. The temperature control circuit and DC drive circuit are designed and realized after comprehensive analysis of the principal and structure. Experiments show SOA and DFB laser can work stably in the circuits. |
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