Showing papers in "Electronics Letters in 1988"
TL;DR: In this article, a new method for the extraction of the MOSFET parameters is presented, which relies on combining drain current and transconductance transfer characteristics, enabling reliable values of the threshold voltage V/sub t/, the low field mobility mu /sub 0/ and the mobility attenuation coefficient theta to be obtained.
Abstract: A new method for the extraction of the MOSFET parameters is presented. The method, which relies on combining drain current and transconductance transfer characteristics, enables reliable values of the threshold voltage V/sub t/, the low field mobility mu /sub 0/ and the mobility attenuation coefficient theta to be obtained.
761 citations
TL;DR: In this article, a focusing and dispersive component is presented which is based on a phased array of bent optical waveguides and combines good optical properties with small dimensions and can be realized with (high-quality) optical lithography.
Abstract: A novel focusing and dispersive component is presented which is based on a phased array of bent optical waveguides. It combines good optical properties with small dimensions and can be realised with (high-quality) optical lithography. Applications are (de)multiplexers, wavelength filters and polarisation splitters.
501 citations
TL;DR: The widely used transversely corrugated surfaces and other alternative surfaces having the same anisotropic surface impedance deserve a common name as discussed by the authors, and it is proposed to call them soft surfaces by analogy with the soft surfaces in acoustics.
Abstract: The widely used transversely corrugated surfaces and other alternative surfaces having the same anisotropic surface impedance deserve a common name. Here it is proposed to call them soft surfaces by analogy with the soft surfaces in acoustics. In the same way artificially hard surfaces are defined. Cylindrical hard waveguides of any cross-sectional shape can support TEM waves.
349 citations
TL;DR: In this article, a new guided-wave phenomenon which causes optical damage to the entire optical fiber transmission path at relatively low optical power levels is reported, which manifests itself as periodic restructuring of the region, similar to that seen in self-focusing.
Abstract: Observation of what appears to be a new guided-wave phenomenon which causes optical damage to the entire optical fibre transmission path at relatively low optical power levels is reported. Damage to the core manifests itself as periodic restructuring of the region, similar to that seen in self-focusing.
248 citations
TL;DR: In this article, a systematic investigation of the excitation of a cylindrical dielectric resonator antenna was undertaken to illustrate the possibility of such a feed structure and to characterise the coupling behaviour and radiation patterns of the system.
Abstract: A systematic investigation of the excitation of a cylindrical dielectric resonator antenna was undertaken to illustrate the possibility of such a feed structure and to characterise the coupling behaviour and radiation patterns of the system.
229 citations
TL;DR: In this paper, the authors compared radio coverage in buildings at 900 MHz and 1700 MHz with the level of signal decay through floors identified, and the reduction in range obtained at 1700 MHz leads to a consideration of the effect it has on system dimensioning, equipment size and costs.
Abstract: Radio coverage in buildings is compared at 900 MHz and 1700 MHz, with the level of signal decay through floors identified. The reduction in range obtained at 1700 MHz leads to a consideration of the effect it has on system dimensioning, equipment size and costs.
222 citations
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TL;DR: Analog circuits can sample, hold, and make practically identical multiple copies of current signals without the need for accurate matching of active or passive circuit components as discussed by the authors, which can sample and hold practically identical current signals.
Abstract: Analogue circuits are presented that can sample, hold, and make practically identical multiple copies of current signals, without the need for accurate matching of active or passive circuit components.
209 citations
TL;DR: RefReflectively monitored Fabry-Perot interferometers which make use of dielectric mirrors in continuous lengths of single mode fiber are characterised for use as temperature and wavelength sensors as discussed by the authors.
Abstract: Reflectively monitored Fabry-Perot interferometers which make use of dielectric mirrors in continuous lengths of single mode fibre are characterised for use as temperature and wavelength sensors.
204 citations
TL;DR: Reference LEMA-ARTICLE-1988-013View record in Web of Science Record created on 2006-11-30, modified on 2016-08-08 as discussed by the authors, created on 2007-12-30 and modified on 2017-07-08
Abstract: Reference LEMA-ARTICLE-1988-013View record in Web of Science Record created on 2006-11-30, modified on 2016-08-08
171 citations
TL;DR: An optical sensor based on the phenomenon of light-excited surface plasmon resonance has been investigated to measure liquid chemical concentrations in this article, where a white light source is used to excite surface PLASmon waves at a metal/analyte interface.
Abstract: An optical sensor based on the phenomenon of light-excited surface plasmon resonance has been investigated to measure liquid chemical concentrations. A white light source is used to excite surface plasmon waves at a metal/analyte interface. The wavelength of maximum absorption in the reflected light depends uniquely on the refractive index of the analyte.
168 citations
TL;DR: In this article, an approach towards a singlemode local loop is presented in which each customer is given a dedicated wavelength channel by taking different wavelength slices from identical LEDs, accomplished by means of WDM components.
Abstract: An approach towards a single-mode local loop is presented in which each customer is given a dedicated wavelength channel by taking different wavelength slices from identical LEDs. This is accomplished by means of wavelength division multiplexing (WDM) components. Results from a fourchannel system operating at 2 Mbit/s over 2.2 km, together with a theoretical analysis of a ten-channel system, are presented.
TL;DR: In this article, the operating frequency of a microstrip antenna on a ferrite substrate can be tuned by varying the DC magnetic bias field applied to the ferrite, with usable patterns and return loss over this band.
Abstract: The operating frequency of a microstrip antenna on a ferrite substrate can be tuned by varying the DC magnetic bias field applied to the ferrite. The letter reports experimental work where a 40% tuning range has been obtained, with usable patterns and return loss over this band.
TL;DR: In this article, the authors demonstrate improved performance in tunable distributed-Bragg-reflector lasers using GaInAs/GaInAsP multiple-quantum-well active layers, and observe linewidths as low as 1.9 MHz, differential quantum efficiencies as large as 33%/front facet at 1.5μm.
Abstract: We demonstrate improved performance in tunable distributed-Bragg-reflector lasers using GaInAs/GaInAsP multiple-quantum-well active layers. We observe linewidths as low as 1.9 MHz, differential quantum efficiencies as large as 33%/front facet at 1.5μm, and rapid electronic access to all frequencies throughout a 1000GHz range.
TL;DR: In this article, an instrumentation system for obtaining cross-sectional images of two-component flows is described, which uses measurements made with capacitance electrodes mounted on the outer surface of the fluid-conveying pipe, and an image reconstruction algorithm based on backprojection.
Abstract: An instrumentation system for obtaining cross-sectional images of two-component flows is described. It uses measurements made with capacitance electrodes mounted on the outer surface of the fluid-conveying pipe, and an image reconstruction algorithm based on backprojection. Images of static physical models simulating a stratified solids/air flow are presented.
TL;DR: In this paper, the ytterbium-doped, silica based, monomode fiber laser operating at discrete wavelengths in the range 1035nm to 1076nm is described.
Abstract: The last few years have seen intense interest and activity in the field of rare earth doped monomode fibre lasers and amplifiers [1,2],since these components could be used in fields as diverse as medicine and communications. Furthermore their small active volume offers a number of important advantages over conventional bulk glass lasers. We have chosen to investigate ytterbium doped fibre as it provides a very "clean" system (ie free from excite-q state absorption. Apart from the energy levels around 11,000cm there are no other levels until the ultra-violet). The ytterbium fibre laser should therefore offer a good system on which to test some of the basic physics of fibre lasers. In addition it offers 3-level, 4-level and quasi 3-level laser transitions. Published work on ytterbium doped glass lasers in bulk form has been sparse with the main publication being that of Snitzer [3]. In this paper we describe the characteristics of an ytterbium-doped, silica based, monomode fibre laser operating at discrete wavelengths in the range 1035nm to 1076nm.
TL;DR: In this article, the formalism of the beam propagation method (BPM) is extended in a self-consistent way so as to allow the analysis of reflections in waveguiding structures containing longitudinal discontinuities.
Abstract: The formalism of the beam propagation method (BPM) is extended in a self-consistent way so as to allow the analysis of reflections in waveguiding structures containing longitudinal discontinuities.
TL;DR: In this article, a new method of optical frequency conversion was described and demonstrated by a 140 Mbit/s DPSK optical transmission experiment with a fibre-to-fibre efficiency of −10dB.
Abstract: A new method of optical frequency conversion is described and demonstrated by a 140 Mbit/s DPSK optical transmission experiment. A modulated optical input signal is converted by 1500 GHz in a modulated optical output signal with a fibre-to-fibre efficiency of −10dB.
NEC1
TL;DR: In this paper, the tuning ranges for 1.5 mu m wavelength tunable distributed Bragg reflector (DBR) lasers were studied experimentally and over 10.0 nm (1.25 THz) quasicontinuous tuning under 5 mW light output conditions and 4.4 nm (550 GHz) continuous tuning at 1 mW were achieved.
Abstract: Tuning ranges for 1.5 mu m wavelength tunable distributed Bragg reflector (DBR) lasers were studied experimentally. Over 10.0 nm (1.25 THz) quasicontinuous tuning under 5 mW light output conditions and 4.4 nm (550 GHz) continuous tuning at 1 mW were achieved.
TL;DR: In this article, a rate equation model was used to calculate the excess noise figure for erbium-doped fiber amplifiers, and it was shown that these can operate with high gain and can have noise figures only 0.2 dB above the quantum limit.
Abstract: A rate equation model is used to calculate the excess noise figure for erbium-doped fibre amplifiers. It is shown that erbium amplifiers can operate with high gain and can have noise figures only 0.2 dB above the quantum limit.
CNET1
TL;DR: In this paper, a field effect transistor has been fabricated with organic semiconductors: scandium diphthalocyanine (DTHC) and nickel phTHC (PHC), and the electrical characteristics are studied in air atmosphere.
Abstract: A field effect transistor has been fabricated with organic semiconductors: scandium diphthalocyanine and nickel phthalocyanine. The electrical characteristics are studied in air atmosphere. The influence of the diphthalocyanine film thickness has been detected.
TL;DR: A 32×32 prototype packet switch is described, built as a part of a broadband ISDN prototype, which has a per-port capacity of 30–55 Mbit/s.
Abstract: We introduce a new method, called ring reservation, to design high-capacity packet switches. Input buffering is used with output port reservations to eliminate packet collisions. We describe a 32×32 prototype packet switch, built as a part of a broadband ISDN prototype, which has a per-port capacity of 30–55 Mbit/s.
TL;DR: In this paper, a narrowband (≈1 nm) LiNbO3 acoustically tunable optical filter with a tuning range adequate to span the 1.3-1.55 μm wavelength range, exploiting the considerable advantages of an unconventional x-cut design is presented.
Abstract: We demonstrate a narrowband (≈1 nm) LiNbO3 acoustically tunable optical filter with a tuning range adequate to span the 1.3–1.55 μm wavelength range, exploiting the considerable advantages of an unconventional x-cut design.
TL;DR: The first unambiguous observation of intrinsic bistability due to space charge build-up in an asymmetric GaAs/(AlGa)As double-barrier resonant tunnelling device was reported in this paper.
Abstract: We report the first unambiguous observation of intrinsic bistability due to space charge build-up in an asymmetric GaAs/(AlGa)As double-barrier resonant tunnelling device.
TL;DR: In this article, the authors report the experimental demonstration of a new passive optical subscriber loop architecture employing 20 channel WDM with 2 nm channel spacings, which includes the demonstration of LED transmission in a dense, multi-wavelength single-mode fiber network.
Abstract: The authors report the experimental demonstration of a new passive optical subscriber loop architecture employing 20 channel WDM with 2 nm channel spacings. The experiment includes the demonstration of LED transmission in a dense, multi-wavelength single-mode fibre network. The experiment also features simultaneous, bidirectional transmission with both LEDs (384 kb/s) and DFB lasers (up to 1.2 Gb/s). >
TL;DR: In this article, an FET source was integrated with a microstrip patch antenna to form an active radiating module, which served both as a radiating element and a resonator in the feedback loop for the FET oscillator.
Abstract: An FET source has been integrated with a microstrip patch antenna to form an active radiating module. The patch antenna serves both as a radiating element and a resonator in the feedback loop for the FET oscillator. Power output of 17mW was achieved at 5.7 GHz.
TL;DR: In this article, a 1.55 mu m wavelength tunable DBR laser with three sections is described and the wavelength tuning range is investigated by changing the composition of the GaInAsP guide layer.
Abstract: Characteristics of a 1.55 mu m wavelength tunable DBR laser with three sections are described. The wavelength tuning range is investigated by changing the composition of the GaInAsP guide layer. The maximum change of the Bragg wavelength is nearly 10 nm at lambda /sub g/=1.38 mu m, and a continuous tuning range of 6.2 nm is achieved for lambda /sub g/=1.29 mu m.
TL;DR: In this article, a 1.5μm self-pulsating multielectrode DFB LD was used for all-optical timing extraction from an intensity modulated 196 Mbit/s return to zero optical data stream by the injection locking technique, using a single-input single-output (SISO) DFB.
Abstract: All-optical timing extraction from an intensity modulated 196 Mbit/s return to zero optical data stream by the injection locking technique, using a 1.5μm self-pulsating multielectrode DFB LD is demonstrated. A frequency lock-in range, which depends upon both the injection signal level and the length of space continuation is investigated.
TL;DR: This famous anthology describes the theoretical analysis of converter performances, the actual design of converters and their simulation, circuit implementations, and applications.
Abstract: This now famous anthology brings together various aspects of oversampling methods and compares and evaluates design approaches. It describes the theoretical analysis of converter performances, the actual design of converters and their simulation, circuit implementations, and applications.
TL;DR: In this paper, the frequency of a GaInAsP DFB laser has been locked to the 2p10-3d3 transition of krypton atoms at 1.5339 μm using the optogalvanic effect.
Abstract: The frequency of a GaInAsP DFB laser has been locked to the 2p10-3d3 transition of krypton atoms at 1.5339 μm using the optogalvanic effect. The absolute frequency stability was estimated to be better than 4 MHz by using a frequency discriminator which is independent from the frequency-locking servo loop.
TL;DR: In this article, the resonant frequency, input impedance and superstrate thickness of patch antennas covered with dielectric layers were investigated. And the results were useful for the design of antennas to be covered with Dielectric to protect against environmental hazards.
Abstract: Experiments with patch antennas covered with dielectric layers were conducted. Empirical relations between the resonant frequency, input impedance and superstrate thickness are obtained. The results are useful for the design of antennas to be covered with dielectric to protect against environmental hazards.