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Clock Recovery (clock + recovery)

Distribution by Scientific Domains
Engineering100%

Selected Abstracts

Analysis of a clock-recovery technique for circuit emulation services over packet networks

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 1 2008
James Aweya
Abstract One important requirement of circuit emulation services (CES) over packet networks is clock synchronization and timing distribution among the nodes. CES depends on reliable and high-quality timing for operations. In the time division multiplexing (TDM) world, whether plesiochronous digital hierarchy (PDH), synchronous digital hierarchy (SDH) or synchronous optical network (SONET) based, timing and synchronization is inherent in the design of the network. However, when timing critical services such PDH and SDH/SONET are carried over packet network (e.g. IP, Ethernet, etc.), the timing element is lost and has to be carried across the packet network by other means. A well-known and widely implemented technique for clock recovery in CES is one that is based on packet inter-arrival time (sometimes called time difference of arrival) averaging. The technique is very simple to implement but provides good performance only when packet losses and packet delay variation (PDV) are very low and well controlled. This technique has been extensively analysed through simulations but has not been fully characterized analytically with correlated traffic in the literature. In this paper, we provide a full analytical examination of this well-known clock recovery technique. We analyse the effects of correlation of the delay variation in the traffic stream on the quality of the clock recovered by a receiver. We prove analytically that, for a general input process, high correlation of the delay variation produces a large variance of the recovered clock. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Novel all-optical format conversion using an ultrafast-nonlinear interferometer at 10,40 Gbit/s

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2007
Da Li
Abstract All-optical data format conversion from nonreturn-to-zero (NRZ) to pseudoreturn-to-zero (PRZ) using an ultrafast nonlinear interferometer has been proposed and demonstrated for the first time. Stable format conversion from NRZ to PRZ has been achieved at 10,40 Gbit/s. This scheme may be useful for all-optical clock recovery in high-speed optical communication systems. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 508,510, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22183 [source]

Novel scheme for all-optical clock recovery from NRZ signal

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2006
Lina Yin
Abstract A novel NRZ-to-PRZ converter consisting of an SOA and an AWG is proposed. The parameters are investigated through numerical analysis to optimize its performance. In the experiments, all-optical clock recovery from NRZ data and NRZ-to-RZ format conversion are successfully demonstrated at 10 Gb/s, which further proves that the proposed scheme is applicable. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 516,521, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21396 [source]