Optical Packet Switching Systems In The Two-dimensional Optical Orthogonal Codes Of Optical Label Generation And All-optical Processing Technology Research,

In optical packet switching network, a large amount of data is processed in the optical domain, to match the switching capacity and the transmission capacity of WDM systems, enhance the bandwidth utilization efficiency, support a large number of diverse businesses and meet the needs of users. Optical packet switching network is the next generation optical network. There are many key technologies in optical packet switching system, such as optical label processing, optical switching, competitive solutions and all-optical regeneration. As a particularly important technology, optical label processing has direct affect on the rate of optical switching, which is the premise to achieve optical packet switching.In this paper, the optical label generation and all-optical processing techniques in optical packet switching system are preliminary analyzed. The optical label format is proposed and the optical label generation/procession programs are designed. The main contents are as follows:1. A novel optical label format is proposed, which is formed by two-serial arrangement of two-dimensional optical orthogonal codes. Exploiting the good self-correlation characteristics of optical orthogonal codes, this label format can increase the number of asynchronous users. The amount of labels is theoretically analyzed.2. The generation program of optical label is designed. The optical switching and coding is realized by an optical switch and two FBG encoders so that the optical label is generated. The feasibility of this program is verified by simulation and experiment.3. Two kinds of optical label identification programs are proposed. For one program, the optical label is recognized by FBG optical label decoder and SOA in both time and frequency domain. Simulation and experimental results show that the identified signal has good waveform. For the other one, the identification is realized by the time pertinence of a NOLM and four-wave mixing effect in a SOA and the process is in both time and frequency domain. Simulation results show that the identified pulse is good and has high extinction. 4. An optical gate is proposed based on the relationship of drive current and small signal gain of the SOA. The dynamic characteristics of it are experimentally analyzed so that the open and close time is obtained. Optical label erasure is successfully realized based on this gate by experiment.