Research And System Design Of The High Speed DPSK/OOK All-Optical Label Switching System Based On OCSS Technique

Along with the rapid development of communication technology, the demand of network bandwidth continues to expand. The DWDM (Dense Wavelength Division Multiplexing) technology can deploy the huge bandwidth offered by the optical fibers, which solve the bandwidth competition problem to some extent. However, due to electronic rate bottleneck restrictions, there is still a need for a lot of O/E interfaces for adapting the different rates, which greatly degrade the processing rate of the communication network. In order to solve "electronic rate bottleneck" problem, the concept of all-optical switching is proposed, and also become a hot scientific research area in recent years. However, in the all-optical switching technology, there still exists the "optical processing bottleneck" problem. In order to improve the efficiency and the throughput of the network, the optical packet switching based on the electronic and optical system—All-Optical label switching (AOLS) has been proposed: the high-speed optical payload is processed in the optical domain to avoid the bottleneck problems in the electronic routers, and the low-speed control information is processed in the electronic domain.Based on the researches of the effect of OCSS and the theory of MZ modulation, we deeply analyzed a new type of optical labeling technique—High Speed DPSK/OOK combined modulation optical label based on OCSS technique . The simulation model of 40GB/s DPSK/OOK combined modulation AOLS System is established. The transmission performance of the system is analyzed comprehensively, and the key parameters that affect system performance are analyzed and optimized. The results exhibit that this optical label switching network has some impressive advantages including easier label extraction, simpler system establishment, and larger single-channel capacity, and so on.The paper has been completed mainly in the following three aspects:First, the design and theory of signal generation of DPSK/OOK combined modulation based on OCSS technique is researched and the feasibility of the proposed scheme is proved by numerical simulation; the design scheme of AOLS deploying DPSK/OOK combined modulation based on OCSS technique is discussed; following up, edge router, transmission link & dispersion compensation, the core router and the receiver are mainly analyzed.Secondly, the key parameters that impact the transmission performance of payload signals and label signals of the proposed system are studied by numerical simulation: in edge router, optimal driving frequency and label/payload power ratio is obtained by numerical analysis; in transmission link, different dispersion compensation schemes (pre-compensation, post compensation and symmetrical compensation) were considered in the simulation, the scheme with highest performance is investigated; in core router, in the novel label switching module, coupling coefficient and extinction ratio of M-Z modulator are optimized; in the receiver, the BER of DPSK/OOK signal as a function of coupling coefficient for several values of total received optical power is given, and the appropriate band-pass-filter of DPSK receiver is selected.Finally, based on results obtained above, performance of the long-haul AOLS established in this article is studied, and the two key advantages, larger capacity and longer distance, are proved.