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# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 58
• ### Enhancement of SHG efficiency in periodically poled LiNbO3 waveguide utilising a resonance effect

Publication Year: 1996, Page(s):1283 - 1284
Cited by:  Papers (1)
| | PDF (228 KB)

A resonant LiNbO3 waveguide quasi-phase-matched second harmonic generation (SHG) device has been demonstrated. The resonator consisted of a channel waveguide and two dielectric mirrors attached to the waveguide facets. A normalised SHG efficiency of 400%/W and eightfold enhancement of the efficiency utilising a resonance effect were achieved View full abstract»

• ### Use of comb filters for efficient VLSI implementation of reduced clock frequency noise shapers

Publication Year: 1996, Page(s):1268 - 1270
Cited by:  Papers (4)  |  Patents (2)
| | PDF (316 KB)

The use of comb filters as an elegant means of reduced clock frequency noise-shaping without excessive hardware overhead is presented. The significance of the method is illustrated using second order noise-shaping characteristics. A 256 times oversampled and noise-shaped bit-stream sequence is obtained by running a second order noise shaper at a clock frequency four times lower than that of the bi... View full abstract»

• ### Kernel based precomputation scheme for the design of low power combinational circuits

Publication Year: 1996, Page(s):1281 - 1283
| | PDF (364 KB)

The authors present a synthesis algorithm for designing low power combinational circuits by eliminating unnecessary signal transitions. Transforming a given circuit by selecting a kernel as a precomputation logic, the proposed algorithm reduces power dissipation by disabling a portion of the circuits. Experimental results show that the algorithm is efficient for designing low power combinational c... View full abstract»

• ### Narrow linewidth, Q-switched erbium doped fibre laser

Publication Year: 1996, Page(s):1299 - 1300
Cited by:  Papers (3)
| | PDF (232 KB)

The authors report a narrow linewidth, diode pumped, high power Q-switched erbium doped fibre laser for distributed temperature sensing applications using the Landau-Placzek ratio method. An output coupler consisting of an in-fibre Bragg grating enables narrow linewidth operation. A linewidth of 1.3 GHz is reported with a peak power of 100 W and a pulse width of 20 ns at a repetition rate of 200 H... View full abstract»

• ### Parallel algorithm for image rendering and its implementation

Publication Year: 1996, Page(s):1275 - 1277
| | PDF (552 KB)

The authors present a parallel algorithm for fast rendering. A set of zones which can be concurrently processed is identified; this set is split into a number of subsets equal to the number of available processors. Each processor renders, in parallel with the others, a zone of its set View full abstract»

• ### Tomlinson-Harashima precoding for the magnetic recording channel

Publication Year: 1996, Page(s):1267 - 1268
| | PDF (236 KB)

A new view on Tomlinson-Harashima (TH) precoding demonstrates the applicability of this precoding technique to input restricted channels. TH precoders of this kind are derived, and a hybrid of decision feedback equalisation and TH precoding is proposed View full abstract»

• ### Structural dependence of 1.3 μm narrow beam lasers fabricated by selective MOCVD

Publication Year: 1996, Page(s):1304 - 1305
Cited by:  Papers (10)
| | PDF (224 KB)

Lasing characteristics of 1.3 μm narrow beam lasers have been investigated in terms of the energy separation between gain and waveguide regions simultaneously formed by selective MOCVD. The HR-coated lasers with a large energy separation of 110 meV exhibit a low threshold current of 12 mA, a high power of >50 mW, and a high temperature of 120°C with narrow beam divergence of 11° (hor... View full abstract»

• ### All-CMOS temperature independent current reference

Publication Year: 1996, Page(s):1280 - 1281
Cited by:  Papers (33)  |  Patents (3)
| | PDF (208 KB)

An All-CMOS temperature independent current reference circuit was designed by eliminating the mobility dependence term through the combination of a current source which is proportional to mobility and one which is inversely proportional to mobility by using a CMOS square root circuit. The test chip fabricated using a 2 μm n-well CMOS process showed a 1.7% variation in the average for the temper... View full abstract»

• ### Multiwavelength erbium-doped fibre laser using intracavity etalon and cooled by liquid nitrogen

Publication Year: 1996, Page(s):1298 - 1299
Cited by:  Papers (55)  |  Patents (1)
| | PDF (240 KB)

The authors report simultaneous oscillation of 17 0.8 nm spliced wavelengths from a Fabry-Perot (FP) erbium doped fibre laser. Multiwavelength operation is made possible by inserting an intracavity etalon and cooling the erbium doped fibre at 77 K by liquid nitrogen. It is promising as the multiwavelength light source for wavelength division multiplexing (WDM) networks. Heterodyne measurement show... View full abstract»

• ### Effect of semiconductor nonlinear gain on the chirp and spectral properties of amplified subpicosecond optical pulses

Publication Year: 1996, Page(s):1293 - 1294
Cited by:  Papers (4)
| | PDF (224 KB)

The properties of optical pulse chirp and spectra from semiconductor optical amplifiers have been studied numerically for subpicosecond input optical pulses. It is found, in accordance with experimental results, that owing to the effect of nonlinear gain, positive chirp can occur in the trailing edge of the output pulse, and the corresponding spectrum is composed of two dominant peaks. These calcu... View full abstract»

• ### Measure of texture anisotropy for crack detection on textured surfaces

Publication Year: 1996, Page(s):1274 - 1275
Cited by:  Papers (8)
| | PDF (436 KB)

An image analysis algorithm for detecting cracks on textured surfaces is presented. It is based on a new measure of texture anisotropy that is used to characterise the pixels of the image of an inspected surface. Experimental results on the detection of cracks on granite slabs are reported View full abstract»

• ### Scintillation fade and enhancement duration on a 20 GHz satellite downlink

Publication Year: 1996, Page(s):1319 - 1321
| | PDF (296 KB)

Statistics of observed durations of scintillation fades and enhancements on the Olympus satellite 20 GHz downlink are presented for various threshold signal levels and atmospheric turbulence intensities. During weak turbulence most signal amplitude deviations from mean level were shortlived (<1 s). Distribution of fade durations at thresholds >0.8 dB were reasonably well approximated by the ... View full abstract»

• ### WDM transmission measurements on the installed segment H of the TPC-5 optical amplifier undersea cable system

Publication Year: 1996, Page(s):1314 - 1315
| | PDF (240 KB)

WDM transmission tests have been performed on the recently installed segment H of the Trans-Pacific Cable (TPC-5) system. The length of this segment is ~6600 km. The tests were performed at various line transmission rates up to 25 Gbit/s, and at distances up to 1980 km, by looping the received signal back at the ends of the undersea cable. The test results demonstrate that the undersea portion of ... View full abstract»

• ### High-swing cascode MOS current mirror

Publication Year: 1996, Page(s):1251 - 1252
Cited by:  Papers (13)  |  Patents (1)
| | PDF (208 KB)

A high-swing cascode triode-region MOS current mirror, basically comprising a triode-region translinear loop, is proposed. A translinear analysis and measurement results are presented View full abstract»

• ### Introducing time-frequency distribution with a complex-time' argument

Publication Year: 1996, Page(s):1265 - 1267
Cited by:  Papers (12)
| | PDF (340 KB)

A distribution, highly concentrated along the instantaneous frequency, is introduced using a complex-time' signal argument. Realisation of a signal with complex argument, using a signal with a real argument, is presented View full abstract»

• ### 10 GHz, 2ps regeneratively and harmonically FM mode-locked erbium fibre ring laser

Publication Year: 1996, Page(s):1285 - 1287
Cited by:  Papers (28)  |  Patents (2)
| | PDF (532 KB)

A 10 GHz regeneratively and harmonically FM mode-locked erbium fibre ring laser is reported for the first time. The output pulse width is 2 ps and the spectral width is 1.4 nm, resulting in a time bandwidth product of 0.34. The output pulse is almost transform limited, despite the FM mode-locking. This can be attributed to the anomalous group velocity dispersion which compensates for the up-chirpi... View full abstract»

• ### Prevention of gain saturation by multi-layer quantum dot lasers

Publication Year: 1996, Page(s):1302 - 1304
Cited by:  Papers (20)
| | PDF (388 KB)

The authors compare the threshold current density jth against the laser length of a single layer quantum dot (SLQD) laser with a sixfold multilayer quantum dot (MLQD) laser. Gain saturation is not observed in the MLQD laser. They calculate jth against the number of dot layers including gain saturation. The strong impact of thermal coupling of carriers on jth is dem... View full abstract»

• ### Cryptanalysis of Krouk's public-key cipher

Publication Year: 1996, Page(s):1279 - 1280
Cited by:  Patents (1)
| | PDF (208 KB)

The cryptanalysis of a recently proposed public-key cipher is presented. The mathematical structure of the cipher is based on linear complementary subspaces over a finite field. The cipher is broken simply by multiplying the ciphertext by a matrix which is the multiplicative inverse of a matrix formed with the public information available View full abstract»

• ### High CW power (>200 mW/facet) at 3.4 μm from InAsSb/InAlAsSb strained quantum well diode lasers

Publication Year: 1996, Page(s):1296 - 1297
Cited by:  Papers (8)
| | PDF (300 KB)

Strained quantum well diode lasers consisting of compressively strained InAsSb active layers and tensile strained InAlAsSb barrier layers have exhibited CW power of 215 mW/facet at 80 K. The internal quantum efficiency and internal loss coefficient at 80 K are estimated to be 63% and 9 cm-1, respectively View full abstract»

• ### Experimental I-V characteristics of AlGaAs/GaAs heterojunction bipolar transistors with very thin bases

Publication Year: 1996, Page(s):1323 - 1324
| | PDF (244 KB)

Npn abrupt AlGaAs/GaAs heterojunction bipolar transistors with thin base widths (WB) down to 200 Å have been fabricated for the first time, and their collector and base current-voltage characteristics have been studied. The experimental results show that the surface recombination base current and the base bulk recombination current are both significantly lower in 200 Å base ... View full abstract»

• ### Design of a performance enhanced traceback algorithm for the Viterbi decoder

Publication Year: 1996, Page(s):1254 - 1255
Cited by:  Patents (1)
| | PDF (236 KB)

The authors propose an efficient traceback scheme for the parallel hardware implementation of the Viterbi algorithm. Compared to the conventional Viterbi algorithm, where output is selected arbitrarily when multiple survivor paths exist, the proposed algorithm decides decoding output by analysing the survivor paths of consecutive tracebacks. Experimental results show that the proposed algorithm ex... View full abstract»

• ### Coupling coefficients of gain-coupled distributed feedback lasers with absorptive grating

Publication Year: 1996, Page(s):1288 - 1290
Cited by:  Papers (2)  |  Patents (1)
| | PDF (308 KB)

An effective coupling coefficient is introduced for gain-coupled distributed feedback lasers with absorptive grating. When radiation and other partial wave coupling effects are considered, the effective coupling coefficient will change significantly. In some cases, it will become real, although both loss and index coupling are presented View full abstract»

• ### Estimation of the Gilbert model parameters using the simulated annealing method

Publication Year: 1996, Page(s):1256 - 1258
Cited by:  Papers (3)
| | PDF (336 KB)

An estimation method based on the simulated annealing algorithm is proposed for computing the Gilbert model parameters from sample error sequences. Experimental results indicate that the simulated annealing method yields estimates which more closely match the experimental error statistics View full abstract»

• ### Direct generation of a 750 fs, 10 GHz pulse train from a regeneratively mode-locked fibre laser with multiple harmonic modulation

Publication Year: 1996, Page(s):1291 - 1293
Cited by:  Papers (2)  |  Patents (6)
| | PDF (352 KB)

A 750 fs transform-limited pulse train at 10 GHz has been directly generated for the first time from a regeneratively mode-locked fibre laser which has two synchronised amplitude modulations at 10 and 20 GHz View full abstract»

• ### Decoding algorithm for fractal image compression

Publication Year: 1996, Page(s):1273 - 1274
Cited by:  Papers (4)
| | PDF (292 KB)

A new iterative decoding method is proposed for fractal image compression. Convergence properties are provided. Experimental results show the superiority of the new method over the conventional decoding procedure 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