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# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 51
• ### Polarisation-independent all-optical demultiplexing up to 200 Gbit/s using four-wave mixing in a semiconductor laser amplifier

Publication Year: 1996, Page(s):840 - 842
Cited by:  Papers (24)
| | PDF (344 KB)

Polarisation-independent all-optical time-division demultiplexing is demonstrated up to 200 Gbit/s with <0.5 dB polarisation dependency based on four-wave mixing in depolarised TE and TM modes in a travelling-wave semiconductor laser amplifier View full abstract»

• ### Noise effects in injection locked laser simulation: phase jumps and associated spectral components

Publication Year: 1996, Page(s):818 - 819
Cited by:  Papers (7)
| | PDF (264 KB)

Some clarifying simulation results concerning the effect of noise on injection locking are presented and analysed. A new spectral component near the eigenfrequency, associated with discrete phase jumps, is observed on the injected laser spectrum. This phenomenon, not appreciable if the noise is not taken into account, has also been observed in recent experimental works, with very similar reported ... View full abstract»

• ### Error-free 500 Gbit/s all-optical demultiplexing using low-noise, low-jitter supercontinuum short pulses

Publication Year: 1996, Page(s):833 - 834
Cited by:  Papers (24)
| | PDF (264 KB)

Error-free 500 Gbit/s-to-10 Gbit/s all-optical demultiplexing based on four-wave mixing (FWM) in a 300 m polarisation-maintaining dispersion-shifted optical fibre is successfully demonstrated utilising low-noise 1 ps supercontinuum pulses with ultra-low timing jitter of <100 fs View full abstract»

• ### Optical subcarrier multiplexed system using microwave-optical mixing

Publication Year: 1996, Page(s):839 - 840
Cited by:  Papers (1)
| | PDF (232 KB)

Optical SCM systems using microwave-optical mixing are proposed in the Letter. Narrowband optical resonant receivers instead of wideband optical receivers employed in conventional SCM systems can be used in this scheme. Performance evaluations for both intensity modulated and external modulated SCM systems using microwave optical mixing are discussed View full abstract»

• ### Low noise, all-optical gain controlled Er3+ doped fibre amplifier using asymmetric control laser cavity design

Publication Year: 1996, Page(s):816 - 817
Cited by:  Papers (11)  |  Patents (1)
| | PDF (244 KB)

The authors demonstrate an Er3+ doped fibre amplifier with all-optical, automatic gain control and with near quantum limited, 1480 nm pumped noise performance. The amplifier gain is controlled by in-band laser action, and two design considerations are established for optimum noise performance: the control laser wavelength should be located in a region of high amplifier gain, and the las... View full abstract»

• ### Minimise pattern degradation when subreflector vertex shaping is used to improve feed match

Publication Year: 1996, Page(s):781 - 782
| | PDF (204 KB)

A knob placed at the vertex of a subreflector to reduce subreflector mismatch in a shaped Cassegrain antenna can significantly degrade the radiation pattern and reduce efficiency. A practical procedure is described to lessen these effects. Best results are obtained using a cosine-squared-shaped knob, keeping a low knob height and knob base within the feed blockage region. The importance of simulta... View full abstract»

• ### Wideband indoor channel characterisation using microstrip patch antennas at 1.95 GHz with different antenna height configurations

Publication Year: 1996, Page(s):793 - 795
| | PDF (424 KB)

Results highlighting the improvement in power loss factor n, RMS delay spread and correlation with distance of the indoor channel employing microstrip patch antennas mounted in an optimised height configuration are presented. Extensive power delay profile measurements with four different antenna height configurations in two laboratory environments were conducted using a vector network analyser at ... View full abstract»

• ### Self-resonant piezoelectric thick films for sensing applications

Publication Year: 1996, Page(s):855 - 856
| | PDF (240 KB)

The behaviour of piezoelectric thick films based on a PZT paste screen-printed and fired on alumina substrates has been investigated around their resonant frequencies. Experimental results relative to circular layers are reported, which show the influences on the impedance spectra around resonance owing to lead oxide content in the paste, layer thickness and poling field. These early results sugge... View full abstract»

• ### Effects of pre-chirping on the repeaterless dispersion-managed transmission system

Publication Year: 1996, Page(s):831 - 833
Cited by:  Papers (1)
| | PDF (368 KB)

The authors numerically investigate the interaction of pre-chirping and self-phase modulation in dispersion-managed 10 Gbit/s transmission. The pre-chirping suppresses the chirping induced by self-phase modulation in the post-compensation scheme, while enhancing the signal distortion caused by self-phase modulation in the pre-compensation scheme. They also explain the physical mechanism of signal ... View full abstract»

• ### 10 Gbit/s hybrid integrated photoreceiver array module using a planar lightwave circuit platform

Publication Year: 1996, Page(s):845 - 846
Cited by:  Papers (6)
| | PDF (372 KB)

A high speed optoelectronic hybrid integrated photoreceiver module has been developed using a silica-based planar lightwave circuit (PLC) and a monolithically integrated photoreceiver array. The hybrid integrated photoreceiver module employs two-layer electrical wiring and solder-bump connections for multigigabit/s operation. The module exhibits a very wide 3 dB down bandwidth of 8 GHz, which enab... View full abstract»

• ### Optical processor for multibeam microwave array antennas

Publication Year: 1996, Page(s):822 - 824
Cited by:  Papers (20)
| | PDF (368 KB)

A new optical processor for multibeam microwave transmitting array antennas is proposed by using a spatial optical processing approach. The system is based on the generation of overlapping multiple beams. A two beam experimental optical processor for producing RF signals with different phase distributions and with feeds to array antennas is demonstrated View full abstract»

• ### Narrow-band WDM spectrum analyser without mechanical tuning

Publication Year: 1996, Page(s):838 - 839
Cited by:  Papers (4)
| | PDF (236 KB)

A new WDM spectrum analyser using an optically tunable filter has been realised. The optical source is a three-electrode DBR laser diode with a continuous wavelength range of 13 nm. The filter resolution is 0.02 nm (2.5 GHz) and the polarisation dependence is <0.5 dB View full abstract»

• ### High resolution spatial interferometry of guided optical waves

Publication Year: 1996, Page(s):814 - 816
Cited by:  Papers (2)
| | PDF (364 KB)

The spatial variation of the phase difference Φ(z) between collinear guided waves is measured interferometrically by scanning a localised perturbation along the guide. Milliradian phase resolution is achieved by the use of a quadrature signal. The method is demonstrated with TE⇔TM coupling in Ti:LiNbO3. It yields the absolute value and the uniformity of the birefringence &Delta... View full abstract»

• ### Surface-wave effect in a wideband aperture-coupled stacked microstrip antenna array

Publication Year: 1996, Page(s):792 - 793
Cited by:  Papers (3)  |  Patents (2)
| | PDF (236 KB)

A wide band aperture coupled stacked microstrip antenna at the Ku band is described. The stacked element design achieves bandwidths in excess of 20%, but when incorporated into an array the gain bandwidth is reduced owing to surface wave excitation. Studying the nature of the surface wave interference can help reduce its impact, thereby retaining almost the full bandwidth of the single element View full abstract»

• ### Adaptive second-order Volterra delay filter

Publication Year: 1996, Page(s):807 - 809
Cited by:  Papers (2)
| | PDF (320 KB)

A new adaptive second-order Volterra delay filter is developed to include the linear and quadratic filter coefficients for system modelling and identification. The filter structure is very effective in modelling second-order Volterra systems with sparse system coefficients View full abstract»

• ### Improved recursive estimator with a relative dead zone

Publication Year: 1996, Page(s):854 - 855
Cited by:  Papers (1)
| | PDF (220 KB)

An improved recursive estimation algorithm is presented for robust adaptive control. The estimator has the tightest dead zone which ensures convergence of the estimates whilst maintaining maximum alertness' View full abstract»

• ### Demonstration of fibre four-wave mixing optical demultiplexing with 19 dB parametric amplification

Publication Year: 1996, Page(s):830 - 831
Cited by:  Papers (5)  |  Patents (5)
| | PDF (244 KB)

An optical time-division demultiplexer with 19 dB conversion efficiency, using four-wave mixing at 1550 nm in a single-mode dispersion-shifted fibre, is presented. Eye patterns show successful demultiplexing from 20 Gbit/s to 10 Gbit/s View full abstract»

• ### SNR improvement in silica-based waveguide Rayleigh backscattering measurement using a complex optical low coherence reflectometer

Publication Year: 1996, Page(s):843 - 845
Cited by:  Papers (2)
| | PDF (436 KB)

The authors report a signal-to-noise ratio (SNR) improvement in the Rayleigh backscattering measurement of a silica-based waveguide over 20 cm, achieved by constructing a complex optical low coherence reflectometer with an auxiliary interferometer. The best SNR achieved is 38, which corresponds to signal fluctuations of ±0.1 dB, and the spatial resolution is 1.3 cm. The measured Rayleigh ba... View full abstract»

• ### Coplanar waveguides on dielectric membranes micromachined on a GaAs substrate

Publication Year: 1996, Page(s):821 - 822
Cited by:  Papers (2)  |  Patents (1)
| | PDF (264 KB)

GaAs micromachining technology was used for fabricating coplanar transmission lines on Si3N4 and polyimide membranes deposited on GaAs substrates. On-wafer measurements of scattering parameters up to 75 GHz for several line configurations show a constant phase velocity of 2.9 108 m/s and a predominance of metallic losses with a square root frequency dependence View full abstract»

• ### Low-noise, pulsewidth tunable picosecond to femtosecond pulse generation by spectral filtering of wideband supercontinuum with variable bandwidth arrayed-waveguide grating filters

Publication Year: 1996, Page(s):836 - 837
Cited by:  Papers (7)
| | PDF (240 KB)

Pulsewidth tunable short optical pulses (0.37 ps~11.3 ps) are generated with an average time-bandwidth product of 0.46 by spectral filtering of a 100 nm-broadened supercontinuum with variable bandwidth arrayed-waveguide grating filters. The BER measurements show that the generated pulses are low-noise and promising for use in ultrafast optical signal processing View full abstract»

• ### 1510 mS/mm 0.1 μm gate length pseudomorphic HEMTs with intrinsic current gain cutoff frequency of 220 GHz

Publication Year: 1996, Page(s):848 - 850
Cited by:  Papers (5)
| | PDF (380 KB)

The state of the art for a planar doped pseudomorphic Al0.2 Ga0.8As/In0.2Ga0.8As HEMT with a gate length of 0.1 μm is presented. The devices exhibit an extrinsic and intrinsic transconductance of 1070 and 1510 mS/mm. Respectively, a maximum current density of 550 mA/mm and a peak current gain cutoff frequency of 220 GHz. These results are the highest ... View full abstract»

• ### Universal filter using plus-type CCIIs

Publication Year: 1996, Page(s):810 - 811
Cited by:  Papers (13)
| | PDF (212 KB)

A universal second-order filter circuit with voltage gain using only plus-type current conveyors (CCIIs) is presented. The circuit offers several advantages, such as high input impedance, low filter sensitivities to passive elements, use of grounded capacitors and independent control of ω0, Q and voltage gain with separate grounded resistors. The use of only one type (plus-type or... View full abstract»

• ### Where and when' integrated particle detector

Publication Year: 1996, Page(s):813 - 814
| | PDF (232 KB)

An integrated circuit is described which uses a 32-phase clock to record the arrival time of incident particles. The chip architecture is such that data can be acquired continuously with a temporal resolution of 1 ns and with a peak input frequency approaching 500 MHz. The device incorporates cache memory and write only if data (WOID) techniques to maximise the throughput of the chip View full abstract»

• ### Scanning circular array with null constraints on the radiation pattern

Publication Year: 1996, Page(s):790 - 791
Cited by:  Papers (1)
| | PDF (208 KB)

The authors examine the problem of using a circular antenna array to scan a given radiation pattern over an angular sector of the array plane, while satisfying null constraints at prescribed directions of interference. We solve the problem using an algorithm based on the discrete Fourier transform View full abstract»

• ### Nonlinear two element active antenna array stability analysis

Publication Year: 1996, Page(s):788 - 789
Cited by:  Papers (2)
| | PDF (240 KB)

Closed form analytical equations for the stability condition for the two modes available within a two element active antenna linear array as the element separation is increased are presented for the first time. A mathematical explanation to the mode swap characteristics first reported by Stephan and Young (1988) is given with a prediction of within which mode the array will operate as a function o... View full abstract»

## Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

Full Aims & Scope

## Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White