Title Silicon-based All-Optical Signal Processing Device And Technology

Silicon-based device has unique performance advantages in the field of all-optical signal processing technology and is expected to be applied in the future all optical network and photonic integrated circuits. Therefore, in this dissertation the all-optical signal processing technology based on silicon devices is studied.The all-optical logic gate based on FWM effect in silicon nanowire waveguide is studied in the dissertation. The influence of the waveguide’s parameters on mode effective refractive index, group index and group velocity dispersion (GVD) is studied theoretically by the simulation. A silicon nanowire waveguide with the parameters of thickness/width/length-340nm/400nm/6.2mm is developed, and the FWM working bandwidth and loss characteristic of the device are measured. The results show that there is no obvious change of the FWM conversion efficiency within the C-band for the device. Since the GVD parameter for TMoo mode is smaller according to the simulation results, which results in higher FWM conversion efficiency, the TMoo is utilized for the logic gate operation. The All-optical XOR logic gate operation for40GBaud QPSK signal based on FWM effect in silicon nanowire waveguide is demonstrated, and the eye diagram of the logic gate signal is clearly open, but the BER floor is appeared at10"6. Analysis shows that the main reason is the OSNR deterioration of logic gate signal caused by large nonlinear loss of the device under the high input power, as well as the nonlinear phase noise induced by XPM effect.The1310/1550nm wavelength splitter based on silicon MMI is designed and developed in the dissertation. The influence for device performance with various parameters is studied in detail by simulation, and the device performance is tested in detail by experiment. The test results show that the crosstalk is lower than-15dB near the wavelengths of1320nm and1570nm for two devices with different parameters. After the detailed analyzing for the difference between test results and simulation results, a new design scheme with further optimization for the device is proposed. Finally, the construction of the testing platform for micro/nano photonic device-high precision alignment system with six dimensions adjustable and the realization of automatic coupling for the alignment system are given.The all-optical signal processing techniques based on HNLF are studied in the dissertation. The performance of the reconfigurable all-optical logic gate based on XPM effect in HNLF is studied by simulation at the rate of lOGbps. Simulation results show that the performance of the XOR logic gate is obviously poor compared with the other logic gates in the scheme, which is consistent with the experimental results. After optimizing the signals’wavelength and the length of HNLF, according to the simulation results, error free operation could be realized in the whole C-band when the wavelength interval of the two signals is not less than5nm. Sinc-Nyquist optical pulse with3.6ps FWHM and2.88%duty cycle is generated based on DPMZM. Ultilizing the nonlinear processing technology in HNLF, pulse spectrum is broadened (the number of optical frequency comb is increased) and as the meanwhile the pulse width in time-domain is compressed. Finally, ultilizing the FWM effect in silicon nanowire waveguide, the pulse spectrum is broadened and the pulse width is compressed effectively.