Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 35, Issue 6, 18 March 1999
Volumes & issues:
-
Volume 59 (2023)
-
Volume 58 (2022)
-
Volume 57 (2021)
-
Volume 56 (2020)
-
Volume 55 (2019)
-
Volume 54 (2018)
-
Volume 53 (2017)
-
Volume 52 (2016)
-
Volume 51 (2015)
-
Volume 50 (2014)
-
Volume 49 (2013)
-
Volume 48 (2012)
-
Volume 47 (2011)
-
Volume 46 (2010)
-
Volume 45 (2009)
-
Volume 44 (2008)
-
Volume 43 (2007)
-
Volume 42 (2006)
-
Volume 41 (2005)
-
Volume 40 (2004)
-
Volume 39 (2003)
-
Volume 38 (2002)
-
Volume 37 (2001)
-
Volume 36 (2000)
-
Volume 35 (1999)
-
Volume 34 (1998)
-
Volume 33 (1997)
-
Volume 32 (1996)
-
Volume 31 (1995)
-
Volume 30 (1994)
-
Volume 29 (1993)
-
Volume 28 (1992)
-
Volume 27 (1991)
-
Volume 26 (1990)
-
Volume 25 (1989)
-
Volume 24 (1988)
-
Volume 23 (1987)
-
Volume 22 (1986)
-
Volume 21 (1985)
-
Volume 20 (1984)
-
Volume 19 (1983)
-
Volume 18 (1982)
-
Volume 17 (1981)
-
Volume 16 (1980)
-
Volume 15 (1979)
-
Volume 14 (1978)
-
Volume 13 (1977)
-
Volume 12 (1976)
-
Volume 11 (1975)
-
Volume 10 (1974)
-
Volume 9 (1973)
-
Volume 8 (1972)
-
Volume 7 (1971)
-
Volume 6 (1970)
-
Volume 5 (1969)
-
Volume 4 (1968)
-
Volume 3 (1967)
-
Volume 2 (1966)
-
Volume 1 (1965)
Volume 35, Issue 6
18 March 1999
-
- Author(s): J. Ollikainen ; M. Fischer ; P. Vainikainen
- Source: Electronics Letters, Volume 35, Issue 6, p. 437 –438
- DOI: 10.1049/el:19990324
- Type: Article
- + Show details - Hide details
-
p.
437
–438
(2)
A novel thin stacked shorted patch antenna for the 1800 MHz frequency band is presented. The antenna is dual-resonant and small in size. It has a very low profile and a bandwidth of almost 10%, which is sufficient, for example, for GSM1800 or GSM1900 systems. The radiation pattern of the antenna is suitable for directive cellular handset antenna applications.
Thin dual-resonant stacked shorted patch antenna for mobile communications
-
- Author(s): H. Knapp ; H.-D. Wohlmuth ; J. Böck ; A. Scholtz
- Source: Electronics Letters, Volume 35, Issue 6, p. 438 –439
- DOI: 10.1049/el:19990343
- Type: Article
- + Show details - Hide details
-
p.
438
–439
(2)
A monolithically integrated oscillator with a tuning range of 19.5 – 23 GHz is presented. The circuit uses on-chip spiral inductors and achieves a phase noise of –91 dBc/Hz at an offset of 1 MHz. It is manufactured in a 0.5 µm production-near silicon bipolar technology with fT and fmax of 50 GHz. The oscillator consumes 18.5 mA at a supply voltage of 3.3 V. - Author(s): JinhwanJeon and KiyoungChoi
- Source: Electronics Letters, Volume 35, Issue 6, p. 440 –441
- DOI: 10.1049/el:19990331
- Type: Article
- + Show details - Hide details
-
p.
440
–441
(2)
An effective synthesis algorithm is proposed for partitioned bus architecture when the number of buses is constrained. In the proposed algorithm, the probability of bus conflict is reduced, leading to a performance improvement. Experimental results show ~10–50% performance improvement over the conventional method. - Author(s): J. Segura ; I. De Paúl ; M. Roca ; E. Isern ; C.F. Hawkins
- Source: Electronics Letters, Volume 35, Issue 6, p. 441 –443
- DOI: 10.1049/el:19990359
- Type: Article
- + Show details - Hide details
-
p.
441
–443
(3)
A test technique that uses the charge driven into the circuit computed from the transient power supply current is analysed. Experimental data are provided concerning the merits of this technique and its effectiveness at detecting open defects that do not increase the power consumption (those that cannot be detected with IDDQ).
22 GHz monolithically integrated oscillator in silicon bipolar technology
Effective synthesis algorithm for partitioned bus architecture
Experimental analysis of transient current testing based on charge observation
-
- Author(s): S. Ouyang ; Z. Bao ; G. Liao
- Source: Electronics Letters, Volume 35, Issue 6, p. 443 –444
- DOI: 10.1049/el:19990351
- Type: Article
- + Show details - Hide details
-
p.
443
–444
(2)
An information criterion is introduced for extracting the minor component associated with the covariance matrix of an input process. An adaptive stepsize learning algorithm (ASMCEX) is proposed. The analysis shows that the ASMCEX algorithm has an equilibrium point. The simulations show that the ASMCEX algorithm can improve the convergence speed significantly. - Author(s): Char-DirChung ; Fu-ChuanHung ; Yi-LingChao
- Source: Electronics Letters, Volume 35, Issue 6, p. 444 –445
- DOI: 10.1049/el:19990361
- Type: Article
- + Show details - Hide details
-
p.
444
–445
(2)
An L-phase-levelled coherent frequency/phase modulation (LCFPM) scheme is proposed and analysed for additive white Gaussian noise channels. The optimised LCFPM scheme with L > 2 is found to have superior bandwidth efficiency to the conventional dual-frequency quadrature frequency/phase modulation scheme. - Author(s): M. Chiani
- Source: Electronics Letters, Volume 35, Issue 6, p. 445 –446
- DOI: 10.1049/el:19990344
- Type: Article
- + Show details - Hide details
-
p.
445
–446
(2)
A new expression for the Marcum Q-function involving an integral over a fixed interval is given. Tight upper and lower bounds are then derived and applied to the performance evaluation of noncoherent and differentially coherent detection of digital modulation over Nakagami fading channels. - Author(s): QinghuaShi and ShixinCheng
- Source: Electronics Letters, Volume 35, Issue 6, p. 447 –448
- DOI: 10.1049/el:19990328
- Type: Article
- + Show details - Hide details
-
p.
447
–448
(2)
Based on filter bank theory, a new scheme for spreading sequence generation is proposed for direct sequence code division multiple access (DS-CDMA) systems. It is shown that optimal spreading sequences produce much less multiple access interference (MAI) than Gold codes with comparable lengths. - Author(s): J.P. Fonseka
- Source: Electronics Letters, Volume 35, Issue 6, p. 448 –449
- DOI: 10.1049/el:19990311
- Type: Article
- + Show details - Hide details
-
p.
448
–449
(2)
A class of chirp modulation called partial response continuous phase chirp modulation is introduced by extending the length of the baseband pulse for more than one interval. Partial response chirp signals are constructed at finite numbers of states. Numerical results show that partial response chirp signals perform significantly better and they also have better spectral variations than the known chirp signals. - Author(s): XiaodongWu ; YongmingLi ; HongyiChen
- Source: Electronics Letters, Volume 35, Issue 6, p. 449 –450
- DOI: 10.1049/el:19990330
- Type: Article
- + Show details - Hide details
-
p.
449
–450
(2)
A programmable one-dimensional discrete wavelet packet transform processor is presented. Compared with existing architectures, the proposed processor can carry out both wavelet transforms and wavelet packet transforms, and is suitable for high-tap filters and high decomposition levels. It is small, and is especially suitable for on-chip or single-chip implementation. - Author(s): R.A. Said
- Source: Electronics Letters, Volume 35, Issue 6, p. 450 –452
- DOI: 10.1049/el:19990329
- Type: Article
- + Show details - Hide details
-
p.
450
–452
(3)
A new sampling electrostatic force microscopy technique for non-invasive measurement of microelectronic circuits is presented. The technique utilises a pulsewidth modulated sampling signal at the probe end to enable internal voltage measurement. Unlike previous sampling methods, the presented technique does not require broadband elements. - Author(s): A.D. Khzmalyan and A.S. Kondrat'yev
- Source: Electronics Letters, Volume 35, Issue 6, p. 452 –453
- DOI: 10.1049/el:19990323
- Type: Article
- + Show details - Hide details
-
p.
452
–453
(2)
An iterative fast-convergent phase-only method for shaping the amplitude spectrum of a packet of radio pulses is developed. Its efficiency is verified by a numerical experiment. - Author(s): E. Mumolo and C. Vanon
- Source: Electronics Letters, Volume 35, Issue 6, p. 453 –454
- DOI: 10.1049/el:19990339
- Type: Article
- + Show details - Hide details
-
p.
453
–454
(2)
A simple yet powerful algorithm for enhancing a signal corrupted by microinterruptions is outlined. The algorithm performs a texture analysis of the peak-based spectrogram image for correcting the damage caused by noise and has been used as a pre-processor in hidden Markov model (HMM) speech recognition. Improvements in accuracy as high as 16% have been obtained with the T120 database. - Author(s): G.A. da Silva and F.M. de Assis
- Source: Electronics Letters, Volume 35, Issue 6, p. 454 –456
- DOI: 10.1049/el:19990341
- Type: Article
- + Show details - Hide details
-
p.
454
–456
(3)
Space-time trellis coded modulation is combined with a rotated signal set for transmission in mobile communication channels. Two systems are proposed and their performances simulated over slow selective fading channels. - Author(s): S. Ghaemmaghami and S. Sridharan
- Source: Electronics Letters, Volume 35, Issue 6, p. 456 –457
- DOI: 10.1049/el:19990316
- Type: Article
- + Show details - Hide details
-
p.
456
–457
(2)
A method for encoding the spectral characteristics of speech, at rates below 180 bit/s, using hierarchical temporal decomposition (HTD) is proposed. A set of the log-area-ratio (LAR) parameters, extracted from a given block of speech, are approximated through Gaussian interpolation between the most-steady frames detected by the HTD. This results in a smaller set of parameters which are encoded using vector quantisation. It is shown that the same spectral distortion is obtained with the new coder at a rate of 180 bit/s as that using a scalar quantisation, TD-based coder, at 600 bit/s. - Author(s): SeunghyunMin and Kwang BokLee
- Source: Electronics Letters, Volume 35, Issue 6, p. 457 –459
- DOI: 10.1049/el:19990346
- Type: Article
- + Show details - Hide details
-
p.
457
–459
(3)
A channel estimation scheme, based on both pilot and traffic channels, is proposed for next generation DS/CDMA systems. This scheme has no channel estimation delay, and is found to perform significantly better than a scheme based on only the pilot channel.
Adaptive step-size minor component extraction algorithm
Coherent frequency/phase modulation scheme
Integral representation and bounds for Marcum Q-function
Optimal spreading sequence design based on PR-QMF theory
Partial response continuous phase chirp modulation
Programmable wavelet packet transform processor
Pulsewidth modulation technique for sampling electrostatic force microscopy
Synthesis of spectrum of packet of radio pulses by phase-only control
Texture analysis approach for improving HMM speech recognition in presence of microinterruptions
Using space-time TCM with rotated constellations for transmission over mobile communications channels
Very low rate speech coding using temporal decomposition
Zero-delay channel estimation based on pilot and traffic channels for DS/CDMA systems
-
- Author(s): B.S. Randhawa ; A.C. Marvin ; A.D. Papatsoris
- Source: Electronics Letters, Volume 35, Issue 6, p. 459 –460
- DOI: 10.1049/el:19990314
- Type: Article
- + Show details - Hide details
-
p.
459
–460
(2)
The problem of an electromagnetic field propagating and scattering in a small finite-difference time-domain (FDTD) mesh enveloped in a larger ray-tracing region is investigated. - Author(s): W.J. O'Connor
- Source: Electronics Letters, Volume 35, Issue 6, p. 460 –462
- DOI: 10.1049/el:19990332
- Type: Article
- + Show details - Hide details
-
p.
460
–462
(3)
In TLM modelling of lossy systems, instead of concentrating losses in lumped resistors or stubs, an attempt is made to model the losses as distributed, in the ‘connect’ or ‘propagate’ stage, while leaving the scattering lossless. TLM transmission and reflection coefficients are derived using a novel, distributed, quasi-black box approach. The coefficients agree with those from lumped resistor analysis. The implications are discussed in the context of lossy TLM modelling in general.
Hybrid uniform theory of diffraction finite-difference time-domain method for scattered waves
TLM coefficients with distributed losses
-
- Author(s): S. Ertürk and T.J. Dennis
- Source: Electronics Letters, Volume 35, Issue 6, p. 462 –463
- DOI: 10.1049/el:19990307
- Type: Article
- + Show details - Hide details
-
p.
462
–463
(2)
A technique is presented for approximating the spherical harmonic representation error during analysis, which in turn can be applied to determine a reasonable representation order for spherical harmonic modelling. The order is estimated according to a selected final error value instead of it having to be set in advance. In this way the modelling process is automated. - Author(s): E.R. Davies
- Source: Electronics Letters, Volume 35, Issue 6, p. 463 –465
- DOI: 10.1049/el:19990358
- Type: Article
- + Show details - Hide details
-
p.
463
–465
(3)
The problem of designing optimal templates for detecting image features is discussed. An equal area rule is derived which reduces the uncertainty involved when masks with a large number of free parameters have to be designed. - Author(s): J. Jiang and M. Reddy
- Source: Electronics Letters, Volume 35, Issue 6, p. 465 –466
- DOI: 10.1049/el:19990364
- Type: Article
- + Show details - Hide details
-
p.
465
–466
(2)
A low cost rate control scheme is presented to achieve an open-loop rate control for JPEG-LS near lossless coding mode, the forthcoming new standard for lossless image compression. The scheme is implemented by further exploitation of the local texture analysis, designed in JPEG-LS, to indicate the compressibility indirectly. Hence, the information loss level may be controlled automatically and can be adaptive to the local texture. Consequently, a similar compression ratio is maintained for different images. - Author(s): Young-SikKim ; O-HyungKwon ; Rae-HongPark
- Source: Electronics Letters, Volume 35, Issue 6, p. 466 –468
- DOI: 10.1049/el:19990327
- Type: Article
- + Show details - Hide details
-
p.
466
–468
(3)
A wavelet based multiresolution watermarking method using the human visual system (HVS) is proposed, with the number of watermarks embedded proportional to the energy contained in each band. Experiments show that the proposed three-level wavelet based watermarking method is robust to some attacks such as, for example, joint photographic experts group (JPEG) compression, smoothing and cropping, collusion.
Approximating spherical harmonic representation order
Designing optimal image feature detection masks: Equal area rule
Open-loop rate control for JPEC-LS near lossless image compression
Wavelet based watermarking method for digital images using the human visual system
-
- Author(s): T.W. Cusick
- Source: Electronics Letters, Volume 35, Issue 6, p. 468 –469
- DOI: 10.1049/el:19990336
- Type: Article
- + Show details - Hide details
-
p.
468
–469
(2)
Alvarez et al. use Gray codes to study the symbolic sequences with two symbols which arise from superstable orbits of iterations of quadratic maps. They state several results without proof. A simplified version of this idea is presented, and proofs for the assertions proposed there are presented.
Gray codes and the symbolic dynamics of quadratic maps
-
- Author(s): A.A. Ciubotaru
- Source: Electronics Letters, Volume 35, Issue 6, p. 469 –471
- DOI: 10.1049/el:19990348
- Type: Article
- + Show details - Hide details
-
p.
469
–471
(3)
Several simple 4th power-law circuits compatible with current integrated-circuit technologies are presented. The circuits use matched symmetrical junction field-effect transistors and require no DC power supply.
4th power-law circuits using junction field-effect transistors
-
- Author(s): Min-CheolOh ; Myung-HyunLee ; Hyung-JongLee
- Source: Electronics Letters, Volume 35, Issue 6, p. 471 –472
- DOI: 10.1049/el:19990308
- Type: Article
- + Show details - Hide details
-
p.
471
–472
(2)
TE-pass and TM-pass waveguide polarisers in polymer waveguides using a buried layer of highly birefringent polyimide are presented. The two polarisers are fabricated based on a consistent process to insert polyimide for the buried ribs in TE-pass polarisers and for lateral cladding in TM-pass polarisers, respectively. Polarisation extinction ratios of 35 and 40 dB are obtained for the TE-pass and TM-pass polarisers, respectively.
TE-pass and TM-pass waveguide polarisers with buried birefringent polymer
-
- Author(s): Y. Matsui ; M.D. Pelusi ; S. Arahira ; Y. Ogawa
- Source: Electronics Letters, Volume 35, Issue 6, p. 472 –474
- DOI: 10.1049/el:19990322
- Type: Article
- + Show details - Hide details
-
p.
472
–474
(3)
Simultaneous two-mode lasing operation for 0.56 – 3.4 THz beat signal generation is achieved from a single sampled-grating DBR laser by simply controlling the bias current. A high autocorrelation modulation depth and > 30 dB suppression of the other cavity modes is demonstrated. - Author(s): A. Ougazzaden ; S. Bouchoule ; A. Mereuta ; E.V.K. Rao ; J. Decobert
- Source: Electronics Letters, Volume 35, Issue 6, p. 474 –475
- DOI: 10.1049/el:19990315
- Type: Article
- + Show details - Hide details
-
p.
474
–475
(2)
Long wavelength bulk InGaAsN semiconductor laser structures have been grown on GaAs substrate by AP-MOVPE, using DMHY and TBAs. After thermal annealing, GaAs/InGaAsN, and AlGaAs/InGaAsN Fabry-Perot laser diodes were processed from the wafers. At room temperature, stimulated emission was observed at peak wavelength from 1.15 to 1.38 µm, and laser operation was achieved at 1.16 and 1.275 µm. Infinite current density is extrapolated to 12 kA/cm2 for AlGaAs/InGaAsN bulk laser diodes.
Beat frequency generation up to 3.4 THz from simultaneous two-mode lasing operation of sampled-grating DBR laser
Room temperature laser operation of bulk InGaAsN/GaAs structures grown by AP-MOVPE using N2 as carrier gas
-
- Author(s): J. Danglot ; O. Vanbésien ; D. Lippens
- Source: Electronics Letters, Volume 35, Issue 6, p. 475 –477
- DOI: 10.1049/el:19990310
- Type: Article
- + Show details - Hide details
-
p.
475
–477
(3)
Active metallic waveguides based on photonic bandgap structures are proposed. Their operation relies on the electromagnetic properties of mixed two- and three-dimensional photonic crystals. Tuning is induced by reflectivity modulation of the waveguide walls by means of varactor diodes - Author(s): F.J. Kub ; K.D. Hobart ; J.M. Pond ; S.W. Kirchoefer
- Source: Electronics Letters, Volume 35, Issue 6, p. 477 –478
- DOI: 10.1049/el:19990354
- Type: Article
- + Show details - Hide details
-
p.
477
–478
(2)
Microwave ferroelectric capacitors have been fabricated using separation by hydrogen ion implantation and transfer of a 500 nm thick single-crystal SrTiO3 layer to an insulating glass substrate. The capacitor films are of high quality with a measured quality factor of nearly 100 at 10 GHz. - Author(s): F. Gadot ; E. Akmansoy ; A. de Lustrac ; T. Brillat ; A. Ammouche ; J.-M. Lourtioz
- Source: Electronics Letters, Volume 35, Issue 6, p. 478 –480
- DOI: 10.1049/el:19990333
- Type: Article
- + Show details - Hide details
-
p.
478
–480
(3)
Two-dimensional metallic photonic crystals with different lattice period and/or filling factor are combined to provide an ultrawide photonic bandgap starting from zero frequency. It is shown that either sharp resonances or relatively broad transmission windows with high transmission level can be created in this gap by inserting a small number of point defects in the crystals. Results from experiments carried out between 27 and 50 GHz are presented.
Active waveguides patterned in mixed 2D-3D metallic photonic crystal
Single-crystal ferroelectric microwave capacitor fabricated by separation by hydrogen implantation
Transmission resonances in ultra-wideband composite metallic photonic crystals
-
- Author(s): P. Brindel ; B. Dany ; O. Leclerc ; E. Desurvire
- Source: Electronics Letters, Volume 35, Issue 6, p. 480 –481
- DOI: 10.1049/el:19990357
- Type: Article
- + Show details - Hide details
-
p.
480
–481
(2)
A novel in-line regeneration scheme is proposed for any RZ system, based on periodic RZ/soliton/RZ conversion and synchronous modulation within a ‘black box’. The regenerator is shown theoretically to significantly increase transmission distance. - Author(s): B. Liu ; A. Shakouri ; P. Abraham ; Y.J. Chiu ; J.E. Bowers
- Source: Electronics Letters, Volume 35, Issue 6, p. 481 –482
- DOI: 10.1049/el:19990337
- Type: Article
- + Show details - Hide details
-
p.
481
–482
(2)
A novel fused InGaAsP/InP-AlGaAs/GaAs vertical coupler filter is demonstrated. By using the large material dispersion between InGaAsP and AlGaAs and similar waveguide geometries, a 3.6 nm bandwidth and 5 nm polarisation dependent wavelength shift using a 1.1 mm long fused vertical coupler has been achieved. - Author(s): D. Mahgerefteh ; P.S. Cho ; P. Tayebati
- Source: Electronics Letters, Volume 35, Issue 6, p. 482 –484
- DOI: 10.1049/el:19990318
- Type: Article
- + Show details - Hide details
-
p.
482
–484
(3)
A Fabry-Perot optical discriminator is used to reduce the pattern dependence of a semiconductor optical amplifier wavelength converter at 10 Gbit/s. In conjunction with a voltage tunable microelectromechanical bandpass filter, this allows a reduction of conversion penalty for multiple wavelength channels. - Author(s): M.N. Khan ; B.I. Miller ; E.C. Burrows ; C.A. Burrus
- Source: Electronics Letters, Volume 35, Issue 6, p. 484 –485
- DOI: 10.1049/el:19990353
- Type: Article
- + Show details - Hide details
-
p.
484
–485
(2)
An integrated high-speed 1 × 4 switch array on InP-substrate using 8 GHz Y-branch switch elements is described. This switch array is suitable for optical time division multiplexing (OTDM) and demultiplexing data at 10 Gbit/s over a wide optical bandwidth. The channel-channel isolation and insertion loss are 18 and 15 dB, respectively, which may be improved by optimisation of the switch design and fabrication techniques. - Author(s): B. Dagens ; J.Y. Emery ; C. Janz
- Source: Electronics Letters, Volume 35, Issue 6, p. 485 –486
- DOI: 10.1049/el:19990104
- Type: Article
- + Show details - Hide details
-
p.
485
–486
(2)
Multiwaveguide SOA for increased saturation power without noise penalty The authors present a new semiconductor optical amplifier (SOA) concept, the multiwaveguide SOA (MWG-SOA), which associates N parallel SOAs and yields a 10log(N) dB saturation power increase without noise penalty, for the same small-signal gain as each single SOA. The MWG-SOA concept is experimentally validated. - Author(s): M. Kobayashi
- Source: Electronics Letters, Volume 35, Issue 6, p. 486 –488
- DOI: 10.1049/el:19990312
- Type: Article
- + Show details - Hide details
-
p.
486
–488
(3)
A new configuration for improving the noise performance of an optical gain-clamped erbium-doped fibre amplifier is proposed. The effect is also demonstrated by experimentally comparing the noise figure of the proposed configuration to that of the previously proposed configuration. - Author(s): M. Murakami ; T. Matsuda ; T. Imai
- Source: Electronics Letters, Volume 35, Issue 6, p. 488 –489
- DOI: 10.1049/el:19990347
- Type: Article
- + Show details - Hide details
-
p.
488
–489
(2)
It is experimentally shown that RZ pulse transmission without significant spectral broadening over a wide wavelength range is possible in higher order dispersion managed fibre spans. The use of this technique, together with wideband fibre dispersion and optical passband management techniques, yields long-distance WDM transmission with the largest capacity of 25 × 10 Gbit/s over 9000 km. - Author(s): Y. Shibata ; S. Oku ; Y. Kondo ; T. Tamamura ; M. Naganuma
- Source: Electronics Letters, Volume 35, Issue 6, p. 489 –491
- DOI: 10.1049/el:19990355
- Type: Article
- + Show details - Hide details
-
p.
489
–491
(3)
A semiconductor monolithic add-drop multiplexer is proposed. An electrically tunable grating switch is monolithically integrated with multimode interference couplers, and wavelength selective add-drop multiplexing is achieved in this structure for the first time. The power penalty is as small as 2 dB. - Author(s): A.Y. Elezzabi ; J.C. Sit ; J.F. Holzman ; K. Robbie ; M.J. Brett
- Source: Electronics Letters, Volume 35, Issue 6, p. 491 –493
- DOI: 10.1049/el:19990340
- Type: Article
- + Show details - Hide details
-
p.
491
–493
(3)
SiO thin film vertical diffraction gratings fabricated on Si substrates by the use of an advanced glancing angle deposition (GLAD) technique are demonstrated. Diffraction gratings with variable groove heights and variable grating periods ranging from 100 nm to 10 µm are fabricated in a one-step deposition process. Gratings fabricated with this technique have potential applications in integrated photonic devices. - Author(s): D. Mahgerefteh ; H.-Y. Yu ; P. Sinha ; G.M. Carter
- Source: Electronics Letters, Volume 35, Issue 6, p. 493 –494
- DOI: 10.1049/el:19990338
- Type: Article
- + Show details - Hide details
-
p.
493
–494
(2)
The generation of a 10 GHz train of 35 ps FWHM nearly transform-limited pulses using a distributed feed-back laser and a fibre grating is demonstrated. The externally modulated pulses propagated error-free up to 22000 km in a dispersion-managed soliton system.
‘Black box’ optical regenerator for RZ transmission systems
Fused III-V vertical coupler filter with reduced polarisation sensitivity
Increased speed of semiconductor optical amplifier wavelength converter at multiple channels using Fabry-Perot and microelectromechanical filters
Integrated high-speed 1 × 4 digital Y-branch switch array with passive taper fanouts for fibre interconnection
Multiwaveguide SOA for increased saturation power without noise penalty
Noise figure improvement of optical gain-clamped fibre amplifier by mid-point band reject filter for lasing light
Quarter Tbit/s (25 × 10 Gbit/s) over 9288 km WDM transmission experiment using nonlinear supported RZ pulse in higher order dispersion managed line
Semiconductor monolithic add-drop multiplexer using a grating switch integrated with coupler structure
Thin film vertical diffraction gratings fabricated using glancing angle deposition
Wavelength-stabilised source of nearly transform limited optical pulses for 10 Gbit/s RZ transmission
-
- Author(s): J. Capmany ; D. Pastor ; B. Ortega
- Source: Electronics Letters, Volume 35, Issue 6, p. 494 –496
- DOI: 10.1049/el:19990257
- Type: Article
- + Show details - Hide details
-
p.
494
–496
(3)
The implementation of a tranversal fibre optic RF filter based on subnanometre optical spectrum slicing is reported. The number of taps (34) and the sidelobe suppression (> 35 dB) is the highest reported to date for filters based on this technology. - Author(s): J. Kobelke ; J. Kirchhof ; S. Jetschke ; U. Röpke ; M. Scheffler ; A. Schwuchow
- Source: Electronics Letters, Volume 35, Issue 6, p. 496 –497
- DOI: 10.1049/el:19990334
- Type: Article
- + Show details - Hide details
-
p.
496
–497
(2)
Singlemode fibres for optical 1.3 µm amplification with 760 wt.ppm Pr3+ have been prepared for the first time in the As-S system. The fibres show low losses in the pump and signal region, good fluorescence behaviour and good mechanical properties.
Fibre optic microwave and millimetre-wave filter with high density sampling and very high sidelobe suppression using subnanometre optical spectrum slicing
Small core high NA Pr-doped As-S glass fibres for efficient 1.3 µm amplification
-
- Author(s): K. Baba ; Y. Ohkuma ; M. Miyagi
- Source: Electronics Letters, Volume 35, Issue 6, p. 497 –498
- DOI: 10.1049/el:19990261
- Type: Article
- + Show details - Hide details
-
p.
497
–498
(2)
Silver-gold compound metal island (CMI) films fabricated by using a two-step evaporation method have been investigated for write-once (WO) optical disk memories. It has been experimentally confirmed that the CMI films are more durable than conventional silver island films reported as potential compact disc-compatible WO memories in previous work. In addition, the reflectance of the CMI film is as high as that of the silver island film at 800 nm and can be significantly reduced by heating the films at 150–200°C. This suggests that the silver-gold CMI films may be useful as write-once optical data storage media. - Author(s): A. Méndez ; A. García-Cabañes ; E. Diéguez ; J.M. Cabrera
- Source: Electronics Letters, Volume 35, Issue 6, p. 498 –499
- DOI: 10.1049/el:19990345
- Type: Article
- + Show details - Hide details
-
p.
498
–499
(2)
The r33T and r31T electro-optic coefficients of congruent and quasi-stoichiometric LiNbO3 have been measured with a precision better than 1 % within the range 458 nm – 1.04 µm. The method has revealed a wavelength dependence with differences between both coefficients and both LiNbO3 compositions.
Silver-gold compound metal island films for durable write-once optical disk memories
Wavelength dependence of electro-optic coefficients in congruent and quasi-stoichiometric LiNbO3
-
- Author(s): T. Fujiwara ; M. Takahashi ; M. Ohama ; A.J. Ikushima ; Y. Furukawa ; K. Kitamura
- Source: Electronics Letters, Volume 35, Issue 6, p. 499 –501
- DOI: 10.1049/el:19990320
- Type: Article
- + Show details - Hide details
-
p.
499
–501
(3)
Comparison of the electro-optic (EO) effect between stoichiometric and congruent lithium niobate (LiNbO3) crystals has been investigated using the Mach-Zehnder interferometer at 0.633 µm wavelength. Anisotropic changes of EO coefficients, r33 and r13, have been found between the stoichiometric and congruent LiNbO3 crystals. The measured r33 value in the stoichiometric LiNbO3 is at least 20% larger than that of LiNbO3 with congruent composition, whereas the r13 coefficient of stoichiometric LiNbO3 is the same as that of congruent LiNbO3.
Comparison of electro-optic effect between stoichiometric and congruent LiNbO3
-
- Author(s): M. Zaknoune ; O. Schuler ; F. Mollot ; D. Théron ; Y. Crosnier
- Source: Electronics Letters, Volume 35, Issue 6, p. 501 –502
- DOI: 10.1049/el:19990239
- Type: Article
- + Show details - Hide details
-
p.
501
–502
(2)
0.1 µm Ga0.51In0.49P/In0.2Ga0.8As/GaAs PHEMTs grown by GSMBE have been realised. A new interface GaInP/InGaAs has been studied and optimised to give a 2-DEG density of 2 × 1012 cm–2 with a mobility of 5500 cm2/V s at 300 K. The AuGe/Ni/Au Ohmic contact has been also optimised (Rc = 0.08 Ω.mm) and a new nonselective wet chemical etching technique based on iodic acid (HIO3) has been developed. This device with single δ-doping exhibits state of the art DC and RF performances in this new system with a current density of 780 mA/mm, a breakdown voltage of 9 V, a Gm of 700 mS/mm and an Ft of 120 GHz. - Author(s): D. Reinking ; M. Kammler ; N. Hoffmann ; M. Horn-von Hoegen ; K.R. Hofmann
- Source: Electronics Letters, Volume 35, Issue 6, p. 503 –504
- DOI: 10.1049/el:19990349
- Type: Article
- + Show details - Hide details
-
p.
503
–504
(2)
The first fabrication of Ge p-channel MOSFETs (p-MOSFETs) on Si substrates is reported. A CMOS compatible process based on relaxed Ge layers grown on Si(111) substrates by surfactant-mediated epitaxy (SME) was used. The non-optimised low temperature process yielded normally-off Ge p-MOSFETs with record channel drift mobilities of 430 cm2/Vs. - Author(s): Y. Ding ; S. Jiang ; T. Luo ; Y. Hu ; Y. Miura ; N. Peyghambarian
- Source: Electronics Letters, Volume 35, Issue 6, p. 504 –505
- DOI: 10.1049/el:19990342
- Type: Article
- + Show details - Hide details
-
p.
504
–505
(2)
Crystalline slab waveguides of lithium disilicate (Li2Si2O5) were prepared by surface crystallisation of a lithium disilicate glass after heat treatment. By controlling the depth of the waveguides with varying heat treatment temperatures and times, singlemode and multimode waveguides were obtained. The refractive index and optical propagation loss of the slab waveguides were characterised. - Author(s): J. Song
- Source: Electronics Letters, Volume 35, Issue 6, p. 505 –506
- DOI: 10.1049/el:19990350
- Type: Article
- + Show details - Hide details
-
p.
505
–506
(2)
The process capability of conventional LOCOS isolation for sub-half micrometre custom IC applications is investigated in terms of field oxide thinning and bird's beak encroachment. A 0.4 µm isolation space appears to be the practical limit when the appropriate film thickness combination is used. - Author(s): P. Collot ; S. Delalande ; J. Olivier
- Source: Electronics Letters, Volume 35, Issue 6, p. 506 –508
- DOI: 10.1049/el:19990326
- Type: Article
- + Show details - Hide details
-
p.
506
–508
(3)
The effects are reported of sulphur treatment in Na2S and (NH4)2S solutions for the passivation of AlGaAs laser facets, etched using Cl2-based chemically-assisted-ion-beam-etching. Compared to untreated lasers, a 37% average improvement in the catastrophic optical mirror damage threshold is measured on sulphur-treated broad-area CAIBE lasers. - Author(s): M. Tsuno ; M. Tanaka ; M. Koh ; K. Iwamoto ; H. Murakami ; K. Shibahara ; M.M. Mattausch
- Source: Electronics Letters, Volume 35, Issue 6, p. 508 –509
- DOI: 10.1049/el:19990325
- Type: Article
- + Show details - Hide details
-
p.
508
–509
(2)
A study is presented into the reverse-short-channel effect (RSCE) for Sb S/D ion implantation at 10 keV. A high impurity concentration is found to reduce interstitial movement in the channel, which restricts the level RSCE at short-channel lengths. The interstitials can be healed by thermal treatment at 850°C directly after ion implantation, resulting in the suppression of the RSCE.
0.1 µm Ga0.51In0.49P/In0.2Ga0.8As PHEMT grown by GSMBE with high DC and RF performances
Fabrication of high-mobility Ge p-channel MOSFETs on Si substrates
Lithium disilicate crystalline slab waveguides from surface crystallised glass
Process capability of local oxidation of silicon isolation technology for sub-half micrometre custom IC applications
Sulphur passivation of dry-etched AlGaAs laser facets
Suppression of reverse-short-channel effect in sub –0.1 µm n-MOSFETs with Sb S/D implantation
-
- Author(s): Y.H. Lim and D.C. Hamill
- Source: Electronics Letters, Volume 35, Issue 6, p. 510 –512
- DOI: 10.1049/el:19990319
- Type: Article
- + Show details - Hide details
-
p.
510
–512
(3)
A simple model of a spacecraft DC power system is investigated using the techniques of nonlinear dynamics. Limit cycles, coexisting attractors and chaos are observed. Chaos is confirmed by a positive Lyapunov exponent. The results have implications for reliable spacecraft engineering.
Chaos in spacecraft power systems
Most viewed content for this Journal
Article
content/journals/el
Journal
5
Most cited content for this Journal
-
Extreme multistability in a memristive circuit
- Author(s): Bo-Cheng Bao ; Quan Xu ; Han Bao ; Mo Chen
- Type: Article
-
Absorptive frequency selective surface using parallel LC resonance
- Author(s): Qiang Chen ; Liguo Liu ; Liang Chen ; Jiajun Bai ; Yunqi Fu
- Type: Article
-
Partial spectral search-based DOA estimation method for co-prime linear arrays
- Author(s): Fenggang Sun ; Peng Lan ; Bin Gao
- Type: Article
-
Experimental verification of on-chip CMOS fractional-order capacitor emulators
- Author(s): G. Tsirimokou ; C. Psychalinos ; A.S. Elwakil ; K.N. Salama
- Type: Article
-
54 Gbit/s OOK transmission using single-mode VCSEL up to 2.2 km MMF
- Author(s): G. Stepniak ; A. Lewandowski ; J.R. Kropp ; N.N. Ledentsov ; V.A. Shchukin ; N. Ledentsov Jr. ; G. Schaefer ; M. Agustin ; J.P. Turkiewicz
- Type: Article
