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Delay Lines (delay + line)

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Engineering100%

Selected Abstracts

Continuously tunable incoherent microwave photonic filter using a tunable Mach,Zehnder interferometer as the slicing filter

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2007
Hongyan Fu
Abstract A continuously tunable incoherent microwave photonic filter employing a tunable Mach-Zehnder interferometer (MZI) as the slicing filter is studied. By incorporating the optical variable delay line (OVDL), the frequency spacing of the MZI can be tuned continuously, which in turn makes the whole microwave photonic filter continuously tunable in a wide frequency range. The frequency response characteristics are studied and some simulation results are also given to optimize the present microwave photonic filter. Experimental results show the present filter has good frequency response characteristics and tuning linearity. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2382,2386, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22732 [source]

Performance Evaluation of the KEOPS Wavelength Routing Optical Packet Switch

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 1 2000
Philippe Cadro
This paper presents results concerning the performance evaluation of the KEOPS wavelength routing optical transparent packetswitch. This switch solves contention using optical delay lines; these delay lines are grouped in several sets, in the first stage of the switch. Each input port has access to a few of these delay lines, and each set of delay lines has access to each output port. Non-FIFO output buffers are thus emulated using scheduling on a small number of delay lines with non-consecutive delays. Under simplifying assumptions, analytical models are derived, and checked by simulation. These models provide efficient bounds for estimating packet loss probability, under the assumption of regular, balanced input traffic. It is shown that the proposed switch architecture achieves a good performance in terms of packet loss, with a number of delay lines significantly smaller than the ones currently used in other architectures. [source]

Ultra-wideband pulse waveform generation based on combining subnanosecond Gaussian pulses

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2010
Pavel Protiva
Abstract A technique for generating ultra-wideband pulse waveforms is described in this article. It consists in combining subnanosecond Gaussian pulses from multiple sources. This method enables us to form complex pulse waveforms without the need to use transmission line pulse forming networks and delay lines. Two designs for an experimental generator utilizing the pulse combining principle are presented. The first generator is composed of two positive Gaussian pulsers and one negative Gaussian pulser. Analog time shifters were used to control the timing of each pulser. The circuit can be used as the generator of a Gaussian doublet. The second generator is composed of four identical Gaussian pulsers. Programmable ECL logic delay chips were employed to adjust the timing in this case. The measurements demonstrate the wide capability of the pulse combining scheme for controlling the spectral properties of the pulse waveform that is generated. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2401,2405, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25498 [source]

On the benefits of multifiber optical packet switch

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2004
Yi Li
Abstract In this paper, we study the benefits of using multiple fibers per link in optical packet-switched networks. The node architecture is presented and various contention resolution schemes are evaluated. Comparisons are made between the multifiber switch with a small number of wavelengths per fiber and the traditional single-fiber switch with a large number of wavelengths per fiber. The analytical and simulation results show that although the multifiber switch cannot easily perform as well as a switch with full wavelength conversion, compared to the traditional switch, it significantly reduces the number of wavelength converters and fiber delay lines while achieving a lower packet-loss rate. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 376,378, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20474 [source]