Optical Packet Switching Network Of All-optical Clock Recovery Technology Research

This dissertation focuses on the optical clock recovery techniques inoptical packet switching (OPS) network.As the next generation optical network which is IP traffics oriented, theOPS network will transport internet traffics over optical layer directly, IPpackets in network will be transmitted in optical domain.Compared with that of traditional optical networks, such as SDH/SONET,key techniques and devices used in OPS network will be different. It isbecause that the core of OPS networks is optical signal processing, rather thanelectrical signal processing, for realizing transmitting, routing, forwarding,switching of data packets. So, it is very important to investigate these keytechniques for implementing optical packet switching.Optical clock recovery, as one of the critical techniques of optical packetswitching network, is studied roundly in this paper. The research concentrateson the following two aspects: (1) The investigation about the optical clockextraction from RZ (return-to-zero) coded optical data. (2) The investigationabout the optical clock enhancement and clock recovery of NRZ(nonreturn-to-zero) coded optical data.In chapter two, the architecture and functions of optical packet switchingnode are described first, which is the core of OPS network. And on the base ofthat, key techniques involved in OPS network are introduced. Then, in thefollowing chapters, the optical clock recovery techniques, which are the maincontent of this paper, are discussed.In chapter three, optical clock extraction from RZ coded data isinvestigated. In this section, the existing techniques for clock recovery fromRZ data are studied and compared first, and the peculiarities and advantages ofthe technique using DFB laser are given. Then, with an commercial software...