By Topic

# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 62
• ### Optimisation of dispersion-induced power penalty mitigation in millimetre-wave fibre optic links

Publication Year: 1999, Page(s):69 - 70
| | PDF (228 KB)

The authors investigate the dispersion-induced power penalty (DIPP) in millimetre-wave fibre optic links. It is shown that the modulation index of the local oscillator driving signal at the harmonic upconverting Mach-Zehnder electro-optic modulator affects the quality of the DIPP mitigation View full abstract»

• ### Electromagnetic penetration into 2D multiple slotted rectangular cavity: TE-wave

Publication Year: 1999, Page(s):31 - 32
Cited by:  Papers (1)
| | PDF (192 KB)

Electromagnetic wave penetration into a two-dimensional rectangular cavity with multiple slots in an infinite conducting plane with a finite thickness is investigated. The Fourier transform and a mode-matching technique are used to obtain simultaneous equations, which are solved to represent the scattered and penetrated fields in series forms suitable for numerical computations View full abstract»

• ### Design of short dispersion decreasing fibre for enhanced compression of higher-order soliton pulses around 1550 nm

Publication Year: 1999, Page(s):61 - 63
Cited by:  Papers (2)
| | PDF (332 KB)

Compression of higher-order (N≃3) soliton pulses in standard singlemode fibre followed by compression in short dispersion decreasing fibre (DDF) can product ultra-short fundamental solitons. This design scheme uniquely enables high-quality compression of broad pulses (<30 ps) down to <142 fs over a wide input wavelength range using a remarkably short DDF (<455 m) View full abstract»

Publication Year: 1999, Page(s):11 - 13
Cited by:  Papers (4)
| | PDF (272 KB)

In conventional wavelet transforms, prefiltering is not necessary due to the lowpass property of a scaling function. This is no longer true for multiwavelet transforms. A novel adaptive multiwavelet prefilter is presented which is designed to overcome this problem. Simulation results show that the approximation accuracy of the prefiltering algorithm is satisfactory View full abstract»

• ### Helical WDM ring network architecture

Publication Year: 1999, Page(s):67 - 69
Cited by:  Papers (2)
| | PDF (356 KB)

A new type of wavelength division multiplexing (WDM) ring network architecture based on the broadcast-and-select approach is proposed. Preliminary analysis shows that the architecture, with a simple node design and crosstalk immunity, enables diversity routing, which is essential for survivable WDM ring networks, at a minimum cost of additional fibre View full abstract»

• ### Extended complex RBF and its application to M-QAM in presence of co-channel interference

Publication Year: 1999, Page(s):17 - 19
| | PDF (292 KB)

An extended complex radial basis function (CRBF) network is proposed for the equalisation of a 4-QAM digital communication channel in the presence of additive white Gaussian noise and co-channel interference. The proposed model has complex valued regression weights in the output layer, and the hidden unit is defined by a real valued Gaussian formula with Mahalanobis distance. It is shown by simula... View full abstract»

• ### Learning algorithms for minimum cost, delay bounded multicast routing in dynamic environments

Publication Year: 1999, Page(s):24 - 25
Cited by:  Papers (4)
| | PDF (216 KB)

Distributed stochastic learning automata (SLA) are used to grow' minimum cost delay bounded multicast trees in a dynamic membership environment. It is found that learning automata, which use minimal state information and require only local connectivity knowledge, provide reduced costs over shortest path approaches and comparable static costs to alternative algorithms, by learning to minimise the ... View full abstract»

• ### Tbit/s switching scheme for ATM/WDM networks

Publication Year: 1999, Page(s):30 - 31
Cited by:  Papers (3)  |  Patents (1)
| | PDF (212 KB)

A new high capacity, reservation-based switch architecture for ATM/WDM networks is presented. The scheme is contention-free and highly flexible yielding a powerful solution for high-speed broadband packet-switched networks. Switching management and control are studied for data rates of up to 10 Gbit/s/port, providing and aggregated throughput of over 1 Tbit/s View full abstract»

• ### Demonstration of time interweaved photonic four-channel WDM sampler for hybrid analogue-digital converter

Publication Year: 1999, Page(s):60 - 61
Cited by:  Papers (11)  |  Patents (3)
| | PDF (216 KB)

An experimental demonstration of a novel photonic sampler for a hybrid analogue-digital converter based on time interweaved wavelength channels is described. The technique uses a single modelocked laser to produce multiple wavelength channels where the wavelength channels are time interweaved to form a pulsed optical carrier for signal sampling View full abstract»

• ### Large-signal compression-current measurements in high-power microwave pin photodiodes

Publication Year: 1999, Page(s):82 - 84
Cited by:  Papers (10)
| | PDF (316 KB)

The authors present the first large-signal compression measurements surface-illuminated pin microwave photodetectors. The maximum RF power delivered by the photodiodes was +12, +17 and +20 dBm for bandwidths of 25.3 and 1 GHz, respectively View full abstract»

• ### Polarisation independent all-optical demultiplexing using four wave mixing in dispersion shifted fibre

Publication Year: 1999, Page(s):72 - 73
Cited by:  Papers (6)  |  Patents (3)
| | PDF (240 KB)

A novel polarisation independent demultiplexer based on four wave mixing in a dispersion shifted fibre is proposed using a short, highly birefringent fibre in a forward and backward propagation scheme to allow polarisation diversity operation. The device has been tested with a 4×10 Gbit/s optical time division multiplexing transmitter. Polarisation dependency is less than 0.5 dB and the BER ... View full abstract»

• ### Single-wavelength 40 Gbit/s soliton field transmission experiment over 400 km of installed fibre

Publication Year: 1999, Page(s):75 - 76
Cited by:  Papers (5)
| | PDF (224 KB)

40 Gbit/s soliton transmission over 400 km (57 km amplifier spacing) of installed lines without in-line control has been achieved. The maximum transmission penalties for parallel polarised and polarisation division multiplexed soliton transmission were ~4 and 1 dB, respectively. The transmission distance is the longest ever reported for a field trial with a single wavelength bit rate >20 Gbit/s... View full abstract»

• ### Unified model of PWM switch including inductor in DCM

Publication Year: 1999, Page(s):10 - 11
Cited by:  Papers (1)
| | PDF (168 KB)

The conventional small-signal circuit model in the discontinuous conduction mode (DCM) shows large discrepancies at high frequencies. A new unified small-signal circuit model of the pulsewidth modulation (PWM) switch including inductor in the DCM is proposed to overcome the inaccuracy of the conventional small-signal circuit model View full abstract»

• ### Frequency downconverter for high-capacity fibre grating based beamformers for phased arrays

Publication Year: 1999, Page(s):66 - 67
Cited by:  Papers (2)
| | PDF (240 KB)

A novel all-optical microwave frequency downconverter is proposed which overcomes the effect of the optical beat-noise in X-band grating-based multi-beam phased arrays allowing a significant extension of the number of beams as well as minimum number of optical interconnects View full abstract»

• ### Efficient complexity reduction technique in trellis decoding algorithm

Publication Year: 1999, Page(s):16 - 17
Cited by:  Papers (1)
| | PDF (228 KB)

An efficient reduced search trellis decoding algorithm in which the decoder selects a part of existing paths by using a threshold value of the path metric is proposed. The threshold value at each time stage of the trellis is found by simply investigating the statistics of the path metrics, and does not require any prior knowledge such as the signal-to-noise ratio View full abstract»

• ### Investigation of sensor failure with respect to ambiguities in linear arrays

Publication Year: 1999, Page(s):22 - 23
Cited by:  Papers (1)
| | PDF (208 KB)

An approach to the calculation of the maximum number of ambiguous generator sets of directions of arrival which exist in linear arrays is presented for the first time. A new performance index is also proposed which characterises the importance' of each sensor with respect to ambiguities in the presence of sensor failure View full abstract»

• ### Performance of CDMA/PRMA protocol for Nakagami-m frequency selective fading channel

Publication Year: 1999, Page(s):28 - 29
Cited by:  Papers (4)
| | PDF (204 KB)

The performance of the code-division multiple-access/packet-reservation multiple-access (CDMA/PRMA) protocol for a Nakagami-m frequency selective fading channel is obtained by simulation for mixed voice/data traffic View full abstract»

• ### All-optical 2R regeneration based on interferometric structure incorporating semiconductor optical amplifiers

Publication Year: 1999, Page(s):59 - 60
Cited by:  Papers (10)  |  Patents (2)
| | PDF (240 KB)

All-optical 2R regeneration in an SOA-based interferometric Michelson structure using a novel technique is experimentally demonstrated. An output extinction ratio of ~10 dB is measured for an input extinction ratio of 6 dB and a noise suppression capability of ~4.5 dB is obtained, clearly demonstrating the feasibility of this technique View full abstract»

• ### Widely tunable long-period fibre gratings

Publication Year: 1999, Page(s):81 - 82
Cited by:  Papers (20)  |  Patents (3)
| | PDF (224 KB)

The authors report the realisation of a new type of long-period fibre grating with an enhanced temperature sensitivity of 8O nm/100°C by the use of specially-designed fibre structures incorporating polymers. These new gratings should enable broadly tunable filters for communications systems View full abstract»

• ### RF tunable attenuator and modulator using high Tc superconducting filter

Publication Year: 1999, Page(s):55 - 56
| | PDF (200 KB)

A small path for both control current and radiofrequency (RF) current has been introduced into a high Tc superconducting filter. The interaction between the control current and RF current made the insertion loss of the filter sensitive to the amplitude of the control current. This structure has been used as an RF tunable attenuator and a modulator. 5 dB attenuation range was achieved. The maximum ... View full abstract»

• ### Near room-temperature continuous-wave operation of electrically pumped 1.55 μm vertical cavity lasers with InGaAsP/InP bottom mirror

Publication Year: 1999, Page(s):49 - 50
Cited by:  Papers (4)  |  Patents (2)
| | PDF (236 KB)

The first near room-temperature continuous-wave (CW) operation of a vertical cavity laser based on an epitaxial InGaAsP/InP bottom mirror is reported. The structure employs a package of nine strain compensated GaInAsP quantum wells and a wafer-fused GaAs/AlGaAs top mirror. For a 10 μm diameter device, the threshold current is 6 mA and the input threshold power is 21 mW. The maximum operating te... View full abstract»

• ### 9.5 W CW output power from high brightness 980 nm InGaAs/AlGaAs tapered laser arrays

Publication Year: 1999, Page(s):43 - 45
Cited by:  Papers (9)
| | PDF (316 KB)

High power 980 nm InGaAs/AlGaAs lasers consisting of an array of closely-spaced tapered waveguides, giving low beam divergence and hence high brightness, have been fabricated. The lateral beam divergence is in the range 6-8° (full-width at 1/e2) for all output powers. The vertical beam divergence, which is defined by the layer structure, is 44° (full-width at 1/e2). C... View full abstract»

• ### Low density parity check codes with semi-random parity check matrix

Publication Year: 1999, Page(s):38 - 39
Cited by:  Papers (56)  |  Patents (28)
| | PDF (200 KB)

A semi-random approach to low density parity check code design is shown to achieve essentially the same performance as an existing method, but with considerably reduced complexity View full abstract»

• ### Efficient and fast iterative reweighted least-squares nonrecursive filters

Publication Year: 1999, Page(s):7 - 8
Cited by:  Papers (1)
| | PDF (208 KB)

An efficient and fast technique for designing Lp approximation filters using the iterative reweighted least-squares (IRLS) algorithm is proposed. This technique introduces an extra frequency response which implicitly includes the weighting function such that the filter coefficients can be obtained with O(N2) complexity View full abstract»

• ### Polarisation-independent all-optical circulating shift register based on self-phase modulation of semiconductor optical amplifier

Publication Year: 1999, Page(s):70 - 72
Cited by:  Papers (2)
| | PDF (348 KB)

The authors propose and experimentally demonstrate polarisation-independent all-optical circulating shift register (CSR) based on self-phase modulation of a semiconductor optical amplifier, which is very insensitive to the polarisation of the input pulse train and requires very low switching energy (~176 fJ). An all-optical 91 bit CSR was constructed for an input pulse stream at 2.897 GHz, and a h... 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