Research On High-speed Optical Fiber Transmission System And Novel Optical Circuit Switching Network

All-optical network (AON) is the major trend of future optical communication, which makes it become one of the hot research areas. Supported by the National Natural Science Foundation of China, we focus our research on the two aspects of AON, transmission and switching. The concrete research contents include the intrachannel nonlinearity effects in high-speed optical fiber transmission system, advanced phase modulation techniques, high-speed transmission of systems with dispersion compensated by chirped fiber Bragg gratings, and realization of the all optical switching network based on Optical Circuit Switching (OCS). And the main achievements of this thesis are listed as follows:1. Intrachannel nonlinearity in high-speed optical fiber transmission systems with dispersion compensated by CFBG is studied for the first time. A theoretical model for the calculation of signal amplitude when GDR and IFWM are both taken into account is deduced by small-field perturbation method. Besides, another theoretical model is proposed for the analysis of timing jitter induced by IXPM in optical fiber communication systems using CFBG as dispersion compensator. Based on these two modes, influence of GDR on intrachannel nonlinearity is studied, in detail. The conclusions are very useful for research and design of CFBG-compensated high-speed optical fiber transmission systems.2. The potential of RZ, CSRZ, RZ-AMI, and CSRZ-AMI to suppress the 'ghost' pulse induced by IFWM is compared. The conclusion is a good consult for designing of high speed optical fiber transmission systems.3. Phase noise in RZ-DPSK transmission systems is analyzed. The effect of phase noise on transmission systems is compared, in detail. Besides, the formulas to calculate nonlinear phase noise are proposed for both pre-compensation and post-compensation schemes. Based on these formulas, the phase noise, power tolerance and optimal signal peak power of both dispersion compensation schemes are analyzed and discussed in detail, respectively. The conclusions are consultable for design of phase modulation systems.4. Experimental comparison is accomplished between dispersion compensation fiber and CFBG when they are used as the dispersion compensator of 40Gbit/s NRZ transmission systems. And, with the joint efforts of the whole team members, 500km error-free transmission is achieved when the dispersion is compensated by CFBQ for the first time.5. The reason why RZ optical clock pulses with duty cycle of 33% and 67% can't be generated by single driver z-cut MZM is analysed. And a novel method is proposed and experimental validated.6. A novel method is proposed for tunable width RZ optical clock pulses generation. Numerical simulation shows that by tuning the chirp coefficient of the modulation, RZ optical pulses with duty cycle tunable in the range of 23.8%～33.3% and 47.4%～56.1% will be gotten.7. A demo system based on the conception of "a novel distributed wavelength-divided and fiber-divided OCS system" is established. The security of the system is guaranteed by a novel signaling system. And programming software is complied with LabVIEW for node management of the demo system.