High Speed All-optical Logic And All-optical Storage

All-optical logic and all optical storage is the key technology to realize the ultra-high speed, large capacity optical fiber communication system, which becomes a research hotspot in both domestic and overseas. It overcomes the “electric bottleneck” lead by ”light-electricity-light” in optical fiber communication.. Can ease the network congestion case by data signal processing effectively, greatly improve the processing rate of optical networks. The main content of this thesis as follows:(1) Conventional NOLM-based all-optical logic gates utilize the self-phase modulation effects or cross-phase modulation effect. Here, an improved scheme of NOLM-based all-optical logic is proposed by exploit the nonlinear polarization rotation in the NOLM. The evolution of the polarization state of light is analyzed as well as the effect of the polarization of the input light and the polarization controller in NOLM. Theoretical analysis and numerical simulation results show that all the basic logic gates can be realized use a single NOLM structure, only by adjusting the polarization controller.We demonstrated the feasibility of the scheme experimentally by realizing all optical “NOT”,“AND”, “OR”, “NOR”, “XOR”, “NXOR” at 40Gb/s operation.(2) Realize all-optical logic gates is proposed bases on nonlinear polarization rotation(NPR) in high nonlinear fiber(HNLF). Two optical signals A and B are injected into the HNLF together with a continuous wave. By controlling the optical power and polarization of the optical signal as well as the polarization of the polarizer with respect to the polarization of optical signal/continuous wave, multiple all-optical logic gates can be realized. The theoretical analysis of the optical logic gates based on NPR in HNLF is provided. And we demonstrated the feasibility of the scheme by realizing all optical “and”, “ or”, half-adder and half-subtracter at 10Gb/s operation.(3) All-optical bistability based on injection locked Fabry Perot semiconductor laser(FP-LD) and its application in all-optical storage are studied in this paper. Injection locking of FP-LD has been experimentally studied in this paper.With the experiment analysis of the injection locked FP-LD's output power. Threshold width of hysteresis loops and the extinction-ratio are influenced by the difference of the injection optical-wavelength detuning.Furthermore,2.5GHz optical storage with 10Gb/s input signal is realized by reasonable setting the control signalpower. the feasibility of implementing high-speed all-optical storage is verified by using the injection locked FP-LD,which shows.great applicability to the field of High Speed Optical Fiber Communication.