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Input Port (input + port)
Selected AbstractsPerformance Evaluation of the KEOPS Wavelength Routing Optical Packet SwitchEUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 1 2000Philippe 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] Active integrated antenna for mobile TV signal receptionMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2007Ick-Jae Yoon Abstract This paper proposes a small-sized field-effect transistor (FET) based active integrated antenna (AIA) for terrestrial digital multimedia broadcasting (T-DMB) signal reception, which is one of the mobile TV services allocated to 200 MHz band. The commercially used T-DMB antenna is a 120 mm long monopole, but the size of the proposed one is reduced to 50 mm by the method of active device integration. The active device integrated to the radiator influences not only on the current distribution at the radiator but also the input impedance, results in an antenna size reduction with an enhanced gain. In addition to this, a band-pass filter is designed at the input port of the radiator. This plays a role as a matching circuit between a radiator and an active device as well as provides a band-selection function simultaneously to be free of other high intensity signals existing around the T-DMB band. The antenna effective length related to the same-sized monopole and noise figure are measured to verify the validity of the proposed antenna. The performance of the proposed FET based AIA shows the feasibility of designing absolutely small-sized antenna with active devices integrated compared to an operating frequency band. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2998,3001, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22968 [source] Balanced BPSK modulator for Ka-band communication systemsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2007Ashok Mittal Abstract This article details the design of balanced PSK modulator using integrated finline coplanar line hybrid junction. The PSK signal output is in suspended stripline with incident wave carrier in unilateral symmetric finline. Schottky barrier diodes MA4E2037 from M/ACom has been used for modulation. The balanced configuration offers high isolation between the carrier input port and the modulated carrier output port and thus the pulse width variations and amplitude deviations are suppressed. An insertion loss imbalance of ±1.5 dB with an average loss of 2.5 dB in the two switching states has been achieved over 37.0 to 38.0 GHz against the estimated loss of 2.0 dB. The phase imbalance is ±10° with phase switching from 165° to 185°. As the PSK output signal is in suspended stripline, two BPSK Modulators can easily be combined together to work as QPSK modulator for point to point millimeter wave radio links. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3046,3049, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22910 [source] Performance of duo-stage SOA based all-optical multicasting switching matrix for future grid networkingMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007Bernard H. L. Lee Abstract This paper presents the performance evaluation of a duo-stage SOA based All-Optical Multicasting capable Switch architecture suitable for the requirements of Grid Networking. SOAs based devices are located at the input and the output ports of the switch. The SOAs located at the input port serves as a multicasting and routing device feeding the signals into an N × N arrayed waveguide gratings and the SOAs at the output are regenerators to restore the quality of the signals before sending them into the network. This design uses the non-linearity processes in SOA such as Cross Gain Modulation and Cross Phase Modulation to achieve a maximum of 1,16 multicast at a bit-rate of 10 Gbps within the all-optical switch. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 59,62, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22031 [source] A K-band inverted microstripline-fed linear tapered slot antenna and its 16-element E-plane arrayMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2005Chen Wu Abstract An inverted microstripline-fed linear tapered slot antenna element and a design of its 16-element E-plane array are presented in this paper. The element is designed using the finite-difference time-domain (FDTD) method. The calculated results show that it has a wide-impedance bandwidth in the K-band. To investigate the E-plane array, the return loss at each element input port, the couplings among elements, and the array's radiation patterns are obtained using the FDTD method. Using a unique three-piece assembled structure, the array is fabricated and tested experimentally. The measured results show that it has a wide bandwidth and antenna efficiency. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 241,246, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20784 [source] Design of a UWB planar 180° hybrid exploiting microstrip-slot transitionsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2007A. M. Abbosh Abstract The article describes the design of a planar 180° hybrid with an ultra wideband (UWB) performance. The device employs two substrates with a common ground plane and various microstrip-slot transitions to achieve in-phase and out-of-phase signal division over an ultra wide frequency range. At the initial stage, simple design guidelines are used but the final dimensions are determined using a full-wave analysis and design software package. The simulated and measured results of the proposed device reveal a well balanced power split accompanied by a very good approximation of ideal 180° and 0° differential phase shift across the band 3.1 to more than 11 GHz. Also low insertion losses, good return loss at all of the four ports, high isolation between the input ports and fine isolation between output ports are noted across this frequency band. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1343,1346, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22472 [source] | ||||||||||