Study On Optical Packets Generating And Label Seperatiing Technology Of DCS-RZ

With the rapid development of Internet, services such as voice, data, video etc. needs faster transmitting, switching and processing rate. In the backbone network core router, the "bottleneck" of electronic switching speed has been a trouble for people to overcome, however optical switching technology has been considerate as the alternative to electricity switching technology. Recently, a method based on IP and General Multi Protocol Label Switching(GMPLS) technology has been proposed, though this technology can provide smaller particle size, its IP header processing at the router requires a lot of time, and generally parallel processing technology will lead to serious energy problems. Because of the key technologies in all-optical packet switching, such as optical storage, optical logic device is not mature enough, so the relevant scholars turned their attention to the more attainable technology-optical label switching.At the switching node, Optical Label Switching technology that the address information is written to the low-rate label, while a high rate of data information is written in the payload, is realized by processing the low-rate optical label on the electrical domain while maintaining the payload in the optical domain, the payload will switch to the corresponding output port by the switch module. Optical label switching technique involves several key technologies: modulation format of label, labelling generating, labels separation, labeling processing, payload caching, the new packet generation and switching to the corresponding output port.This paper that mainly focuses on the technologies of optical label modulation formats, label generating and separating, is composed of the following three parts:Firstly, the thesis studys the multi-wavelength DCS-RZ optical packet generating technology based on MZDI device. The DCS-RZ optical packet is composed of the high bit rate DCS-RZ payload and the low bitrate NRZ label. On the VPI optical simulation software, we have designed a system composed of a 4 × 40 Gbps DCS-RZ optical packet generation module and transmission module, a FP cavity optical comb filter is used for multi-wavelength optical label separation in the switching node. The simulation system tests the affection of relative parameters to the signal quality after transmission, and compared the BER of payload and label signal after 288 km fiber transmission. Through the simulation has verified the feasibility of the scheme..Secondly, the DCS-RZ optical packet label separation performance by using the micro-ring resonator as a filter is analysed. Through the theoretical analysis, we have studied the principle performance of the whole micro-ring resonator and Add-Drop multiplexing type(Add-Drop) micro-ring resonator. The micro-ring resonator which has fitted the laboratory micro-ring resonator is used to separate the optical label from the DCS-RZ optical packets in the VPI simulation. After the simulation, we also analyzed the quality deterioration reason of the DCS-RZ payload, and analyzed the effects of micro-ring resonator FWHM to the payload signal quality after filtering.Thirdly, the thesis studys the label separating performance based on two-photon absorption(TPA) effect of the micro-ring resonator by three methods that include the theoretical analysis, simulation test and experimental to verify the feasibility. In the simulation, we have tested the impulse response, ns width impulse response and step signal response based on GaAs material parameters, and analyzes the impact of pump power and pulse width to the exchange window extinction ratio. In the experiment, a silicon-based materials Add-Drop multiplexing type micro-ring resonator is used to verify the switching performance based on TPA effect, and has got the impulse response window, 1ns pulse pump response window, as well as got the largest exchange window length of time-about 18 ns. Finally, by using a 2ns pump pulse to switch the 10 Gbps clock signal, the suppression ratio of the output signal in through and drop ports is respectively 7.5dB and 5.1dB.