Research On The All-optical Logic Based On SOA And HNLF

In the21stcentury, human society entered the era of rapid development ofinformation technology, along with the vigorous development of the Internet, theinformation network has been widely used in various fields of the society. Dramaticincrease in the information and communication, and the urgent needs of a variety ofbusiness services, existing infrastructure network is no longer difficult to adapt to theexplosive growth of the amount of data. Information processing network and thedevelopment of the electronic exchange is close to the limit of the electron velocity,"electronic bottleneck" has seriously hampered the development of high-speedcommunication network, but the development of optical communication networkprovides a feasible way to solve this problem. For the realization of all-opticalnetwork transmission, we do the related research on the realization of all-optical logicgate essential in all-optical communication network in this paper.In this paper, by the study of nonlinear effects in optical amplifier (SOA)including the cross-gain modulation (XGM), cross-phase modulation (XPM) andfour-wave mixing (FWM), the reconfigurable all-optical basic logic based on a singlesemiconductor optical amplifier is proposed. This program can achieve a variety ofbasic logic such as "and","or","not","with or" in the10Gbit/s rate. Verified throughexperimental feasibility, the quality of the output signal obtained in the experiment ofvarous basic logic are analyzed and compared,and analysis its cascadable. Based onthe cascade, We put forward a program to realize the all-optical half adder andall-optical half subtracter baded on two cascaded SOA, we verify the viability of thisprogram and reconfigurable all-optical logic structure cascade through the analysis ofthe experimental results.Though the all-optical logic gate based SOA can be integrated and high-efficiencyadvantages, but the rate bottleneck restricts its application in high-speed all-opticalnetwork. So we do the research on nonlinear polarization ratation in high nonlinearfiber, and put forword the program of all-optical logic gates based on nonlinearpolzrization rotation in high nonlinear fiber. With the NPR in the HNLF,wecancomp letea variety of basic logic functions through the control of the wavelengthdivision multiplexer (WDM) and orthogonal polarization states of the polarization beam splitter (PBS), filtered off the data signal and the DC light signal. Then weanalyze the various logic output signal obtained in the experiment, and verified theviability of this program. This program can change the system operating parameters toachieve almost all basic combinational logic, and can make the all-optical halfadderand all-optical half subtracter which are more complex logic functions achieved inone device. All-optical logic gate based on NPR in HNLF not onl y has thecharacteristics of speed and stability, but also will not be affected by the effect of thepattern, which makes applying ultra-high-speed all-optical signal processing systemprovides a high-speed response the incomparable advantage.