Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 23, Issue 25, 3 December 1987
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Volume 23, Issue 25
3 December 1987
Optically excited resonant beam pressure sensor
- Author(s): D. Uttamchandani ; K.E.B. Thornton ; B. Culshaw
- Source: Electronics Letters, Volume 23, Issue 25, p. 1333 –1334
- DOI: 10.1049/el:19870921
- Type: Article
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Micromechanical silicon beams fabricated by anisotropic etching techniques are coated with a thin layer of chromium. An intensity-modulated laser beam focused on the beam generates transverse vibrations which are detected interferometrically. In the letter we report how the vibration frequency changes with temperature and pressure applied to the beam.
Very low threshold current densities (under 100 A/cm2) in AlGaAs/GaAs single-quantum-well GRINSCH lasers grown by molecular beam epitaxy
- Author(s): H.Z. Chen ; A. Ghaffari ; H. Morkoc ; A. Yariv
- Source: Electronics Letters, Volume 23, Issue 25, p. 1334 –1335
- DOI: 10.1049/el:19870922
- Type: Article
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p.
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Threshold current densities as low as 80 A/cm2 for 3.3 mm-long cavity lasers, and 93 A/cm2 for 520 μm-long cavity lasers have been obtained in AlGaAs/GaAs graded-index separate-confinement heterostructure (GRINSCH) single-quantum-well lasers with quantum-well widths between 65–165 A grown by molecular beam epitaxy. The structures were prepared on (100) GaAs substrates and do not display the earlier reported dependence of lasing threshold characteristics on the quantum-well thickness in the range studied (65–165 A).
Correlation-immunity of Boolean functions
- Author(s): Yang Yi Xian
- Source: Electronics Letters, Volume 23, Issue 25, p. 1335 –1336
- DOI: 10.1049/el:19870923
- Type: Article
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p.
1335
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The correlation-immunity of nonlinear combiners is studied in detail in the letter by the weight analysis of Boolean functions.
New postdetection processing technique for frame synchronisers
- Author(s): L.-K. Shark ; R.J. Simpson ; T.J. Terrell
- Source: Electronics Letters, Volume 23, Issue 25, p. 1337 –1338
- DOI: 10.1049/el:19870924
- Type: Article
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p.
1337
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A new postdetection processing technique to achieve lock-mode frame synchronisation is described. The method is based on a combination of the minimum-error principle and the conventional window technique. Compared with the performance of existing frame synchronisers the new technique is shown to produce an increased unique-word detection probability and a reduced false alarm probability.
Novel high-speed LED transmitter for single-mode fibre and wideband loop transmission systems
- Author(s): G.-K. Chang ; H.P. Leblanc ; P.W. Shumate
- Source: Electronics Letters, Volume 23, Issue 25, p. 1338 –1340
- DOI: 10.1049/el:19870925
- Type: Article
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A new high-speed LED transmitter using novel GaAs MESFET bias and drive circuits has been developed. It can modulate LEDs beyond 560Mbit/s with up to 200 mA drive current. At 560Mbit/s, extinction ratios of 15 dB were attained with devices that otherwise operated up to 250Mbit/s. The transmitter was designed for single-mode loop applications.
Constrained l2 suboptimal model reduction
- Author(s): P. Vilbe and L.C. Calvez
- Source: Electronics Letters, Volume 23, Issue 25, p. 1340 –1342
- DOI: 10.1049/el:19870926
- Type: Article
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A constrained least-squares technique is presented for obtaining approximations to the transfer function of a linear system so that the initial and final values of the responses of the system and its approximation are the same for a broad class of input signals.
AlGaAs/GaAs visible distributed feedback laser operating at 770 nm
- Author(s): Y. Nakano ; Y. Luo ; K. Tada
- Source: Electronics Letters, Volume 23, Issue 25, p. 1342 –1343
- DOI: 10.1049/el:19870927
- Type: Article
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p.
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A visible-light AlGaAs/GaAs DFB laser with practical characteristics oscillating at 770 nm has been fabricated by using two-step liquid phase epitaxy for the first time. Threshold current of 90 mA measured at room temperature is satisfactorily low for its simple oxide stripe structure. The same DFB mode oscillation without mode hopping has been maintained in a considerably wide range of temperature. The results show a possibility of realising a high-performance DFB laser in the visible-wavaelength region.
Highly efficient linearly polarised Raman generation in a germania-core optical fibre
- Author(s): S. Davison and I.H. White
- Source: Electronics Letters, Volume 23, Issue 25, p. 1343 –1345
- DOI: 10.1049/el:19870928
- Type: Article
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The letter reports very efficient Raman generation and polarisation switching effects in a high-germania-content optical fibre, with a small 2μm2 core area. 10 dB Raman amplification has been observed in 5 m of fibre at a pump power of 2W. The Raman emission is only generated along the birefringence axes of the fibre.
Outage probability calculations for a mobile radio system having two log-normal interferers
- Author(s): K.W. Sowerby and A.G. Williamson
- Source: Electronics Letters, Volume 23, Issue 25, p. 1345 –1346
- DOI: 10.1049/el:19870929
- Type: Article
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Outage probability calculations are presented for the case when the transmission from a wanted base station is received by a mobile in the presence of two cochannel-interfering signals for the case where the transmissions suffer log-normal shadowing only. The calculations consider the need to achieve simultaneously both a sufficient SNR and SIR to obtain satisfactory radio reception.
Langmuir-Blodgett deposited cadmium gate inverted InP-GaInAs modulation-doped field-effect transistors
- Author(s): W.K. Chan ; H.M. Cox ; J.H. Abeles ; S.P. Kelty
- Source: Electronics Letters, Volume 23, Issue 25, p. 1346 –1348
- DOI: 10.1049/el:19870930
- Type: Article
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p.
1346
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We report on the Langmuir-Blodgett film deposition and plasma etching of cadmium distearate on n-Gao.47Ino.53As to form a high-barrier-height Schottky barrier. Using this technique to form the gate electrode, we fabricated a 1μm-gate-length inverted InP-GalnAs modulation-doped field-effect transistor (MODFET) with an extrinsic transconductance of 170mS/mm and a cutoff frequencyfT of 19 GHz.
Thermometry of impedances by correlation radiometry
- Author(s): P. Lauer ; Y. Leroy ; J.C. van de Velde ; A. Mamouni
- Source: Electronics Letters, Volume 23, Issue 25, p. 1348 –1350
- DOI: 10.1049/el:19870931
- Type: Article
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p.
1348
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Theoretical considerations and experiments indicate how the temperature of an impedance Z(f) and its position on the line connected to the two inputs of a correlation radiometer can be deduced from the radiometric signals. Such a process should be considered for thermometric applications based on the analysis of the radiometric signal produced by a nonisothermal lossy line.
GMSK frequency detection using decision feedback equalisation
- Author(s): K. Ohno and F. Adachi
- Source: Electronics Letters, Volume 23, Issue 25, p. 1350 –1352
- DOI: 10.1049/el:19870932
- Type: Article
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Frequency detection of GMSK signals using one-bit decision feedback equalisation (DFE) in conjunction with offset decision instant is presented. Experiments on a 16kbit/GMSK signal reception with a premodulation filter bandwidth-bit duration product (Bb T) of 0-25 (typical for mobile radio applications) show that, compared to MSK signal reception, a bit error rate (BER) of 10-2 is obtained with a loss of about 4dB in the signal energy per bit/noise power density ratio (Eb/N0) in the additive white Gaussian noise (AWGN) channels. In the cochannel interference limited channels, a BER of 10-2 is obtainable at a signal/interference power ratio (SIR) about 5-5 dB larger than in the case of MSK signal reception.
1 Gbit/s automatic-power-control-free zero-bias modulation of very-low threshold MQW laser diodes
- Author(s): M. Nakamura ; H. Furuyama ; A. Kurobe
- Source: Electronics Letters, Volume 23, Issue 25, p. 1352 –1353
- DOI: 10.1049/el:19870933
- Type: Article
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p.
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The first 1 Gbit/s, automatic-power-control-free zero-bias modulation has been successfully demonstrated using very low-threshold GaAs/AlGaAs MQW lasers. A stable multi-longitudinal mode oscillation due to zero-bias modulation was also observed. This result simplifies driving circuitry and is an important step towards realisation of high-speed and high-density optoelectronic integrated circuits.
Influence of raypath parameters on digital radio outage
- Author(s): Y. Serizawa and S. Takeshita
- Source: Electronics Letters, Volume 23, Issue 25, p. 1353 –1354
- DOI: 10.1049/el:19870934
- Type: Article
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p.
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The received power frequency correlation coefficient taking account of amplitudes, phase path delays and angles of arrival of rays is derived theoretically to evaluate the frequency selectivity of multipath fading. An estimation of frequency selectivity reduction due to aperture antennas is presented by using ray tracing data.
Equivalent circuit modelling and derivative characterisation of 1.3μm injection lasers
- Author(s): D.E. Ackley
- Source: Electronics Letters, Volume 23, Issue 25, p. 1354 –1356
- DOI: 10.1049/el:19870935
- Type: Article
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p.
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An equivalent circuit model has been developed to describe the CW output characteristics of 1.3 μm injection lasers. Using the model, full derivative characteristics can be generated to emulate the operation of the devices. The model has been specifically applied to optimise the operation of 1.3μm DCPBH lasers by identifying the dominant leakage paths and suggesting structural improvements which minimise the leakage contribution.
Hot electron degradation in the source of asymmetrical LDD structures
- Author(s): B.S. Doyle ; M. Bourcerie ; P. Leclaire ; A. Boudou ; P. Dars
- Source: Electronics Letters, Volume 23, Issue 25, p. 1356 –1357
- DOI: 10.1049/el:19870936
- Type: Article
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p.
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–1357
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Hot carrier stressing has been carried out on LDD n-MOS transistors with gate overlap asymmetry, under conditions of strong source field (Vg > Vd). It is shown that, under these conditions, the device actually suffers hot carrier stressing at the source end of the transistor resulting directly from this high source field.
Depolarisation in Ti:LiNbO3 waveguides and its effect on circuit design
- Author(s): P.G. Suchoski ; T.K. Findakly ; F.J. Leonberger
- Source: Electronics Letters, Volume 23, Issue 25, p. 1357 –1358
- DOI: 10.1049/el:19870937
- Type: Article
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Ti: LiNbO3 waveguides are analysed to determine their depolarisation properties. Depolarisation in 3 cm-long x-cut crystals is consistently −30 to −35 dB, suggesting there is an inherent mechanism limiting the crosstalk to this level. Substantial improvement in crosstalk can only be achieved by placing polarising elements at the sample ends.
Performance of an 8×8 LiNbO3switch matrix as a gigahertz self-routing switching node
- Author(s): D.J. Blumenthal ; P.R. Prucnal ; L. Thylen ; P. Granestrand
- Source: Electronics Letters, Volume 23, Issue 25, p. 1359 –1360
- DOI: 10.1049/el:19870938
- Type: Article
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p.
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The performance of an LiNbO3 integrated-optic crossbar switch as a node in a gigahertz self-routing network is measured. Switch throughput supports 12.5 Gbit/s signals with a measured switching speed of 1.33 GHz. Crosstalk due to RF/ acousto-optic coupling and modulation depth are reported at 1.33 GHz. Optical self-routing of l00 Mbit/s information using the 8×8 switch is demonstrated.
Multichannel intermodulation distortion in high-speed GaInAsP lasers
- Author(s): P. Iannone and T.E. Darcie
- Source: Electronics Letters, Volume 23, Issue 25, p. 1361 –1362
- DOI: 10.1049/el:19870939
- Type: Article
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p.
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We present an experimental study of intermodulation distortion (IMD) in high-speed, long-wavelength GaInAsP lasers modulated up to 8 GHz. It is found that three-tone distortion products are the dominant contribution to IMD interference when the number of subcarriers is large. These distortion data are used with a simple theory to predict accurately the measured signal/noise ratio for each channel of a multichannel subcarrier system.
Threshold selection algorithm for extracting a uniform colour region in an image
- Author(s): Byung-Hwa Chang ; Seong-Dae Kim ; Jae-Kyoon Kim
- Source: Electronics Letters, Volume 23, Issue 25, p. 1362 –1363
- DOI: 10.1049/el:19870940
- Type: Article
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A new threshold selection algorithm for multidimensional feature space is proposed, and its applications to colour images are shown. This algorithm is based on tho recursive application of a simple 1-D threshold selection method (valley detection) to the conditional 1-D histograms. Although the performance of the algorithm such as convergence rate etc. is not yet evaluated, uniform colour regions are successfully extracted by the proposed algorithm for several colour images.
MOVPE studies for the development of GaInAsP/InP lasers with semi-insulating InP blocking layers
- Author(s): P. Speier ; K. Wunstel ; F.J. Tegude
- Source: Electronics Letters, Volume 23, Issue 25, p. 1363 –1364
- DOI: 10.1049/el:19870941
- Type: Article
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The self-aligned selective regrowth of a GalnAsP/lnP BH laser with semi-insulating InP:Fe by atmospheric-pressure MOVPE is reported. A threshold current of 26 mA and 12mW output power at 100mA are obtained. Very low capacitance values of 3–5 pF are measured, promising excellent high-frequency performance.
Preservation of polarisation orthogonality through a linear optical system
- Author(s): L.J. Cimini ; I.M.I. Habbab ; R.K. John ; A.A.M. Saleh
- Source: Electronics Letters, Volume 23, Issue 25, p. 1365 –1366
- DOI: 10.1049/el:19870942
- Type: Article
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It is well known that when two orthogonally polarised optical waves are launched into an optical medium they may experience a loss in orthogonality. In the letter we derive a simple bound on this loss. Our result predicts that orthogonality is virtually preserved for many common single-mode optical components (for example, long lengths of fibres, directional couplers and filters).
Effect of the non-Lorentzian lineshape of semiconductor laser on a PSK coherent heterodyne optical receiver
- Author(s): S. Betti ; G. de Marchis ; E. Iannone ; A. Martellucci
- Source: Electronics Letters, Volume 23, Issue 25, p. 1366 –1367
- DOI: 10.1049/el:19870943
- Type: Article
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In the letter the performances of a PSK synchronous heterodyne optical receiver are evaluated by taking into account the non-Lorentzian lineshape of semiconductor lasers by means of an analytical model.
Gunn diode oscillator constructed in nonradiative dielectric waveguide
- Author(s): J.A.G. Malherbe and M.C. Wijnbeek
- Source: Electronics Letters, Volume 23, Issue 25, p. 1368 –1369
- DOI: 10.1049/el:19870944
- Type: Article
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p.
1368
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The physical construction of a Gunn diode oscillator in non-radiative dielectric waveguide is described. A stripline construction is used for biasing, and the diode is mounted so as to feed a slot which in turn launches the wave into the wave-guide.
Polarisation-diversity receiver for coherent FSK communications
- Author(s): T.E. Darcie ; B. Glance ; K. Gayliard ; J.R. Talman ; B.L. Kasper ; C.A. Burrus
- Source: Electronics Letters, Volume 23, Issue 25, p. 1369 –1371
- DOI: 10.1049/el:19870945
- Type: Article
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p.
1369
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A polarisation-insensitive optical heterodyne receiver, in which two signals with orthogonal polarisations are independently detected and demodulated, and subsequently combined, has been demonstrated for FSK-modulated signals at 50 Mbit/s with a sensitivity of −55.5 dBm (Pe=10−9). The receiver uses the entire received signal and local oscillator signal with only one photodiode in each branch. Differences between the two PINFET detectors result in a ±ldBm sensitivity variation for all polarisation states of the received signal.
Formulas for direct frequency modulation response of two-electrode diode lasers: proposals for improvement
- Author(s): O. Nilsson ; L. Gillner ; E. Goobar
- Source: Electronics Letters, Volume 23, Issue 25, p. 1371 –1372
- DOI: 10.1049/el:19870946
- Type: Article
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1371
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Semiconductor lasers, ModulationFormulas for the frequency and amplitude small-signal modulation response are given with nonlinear gain taken into account. The importance of the phase characteristic is discussed. Curves are shown of the modulus and phase of the frequency modulation for some selected cases and a method is proposed to obtain nearly ideal response.
Elimination of errors in absolute position encoders using m-sequences
- Author(s): G.H. Tomlinson
- Source: Electronics Letters, Volume 23, Issue 25, p. 1372 –1374
- DOI: 10.1049/el:19870947
- Type: Article
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p.
1372
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The position of a linear or shaft-angle encoder can be obtained by reading r consecutive bits of an m-sequence of length L = 2r — 1, written on a single track. The errors that occur when a read is attempted during a transition between bits are considered. It is shown how the errors can be eliminated by means of additional heads. It is found that the number of extra heads required depends on the characteristic polynomial f(x) of the m-sequence and it is shown that, by correct choice of f(x), only two extra heads are required.
Accurate prediction of radiation patterns of dielectric resonator antennas
- Author(s): A.A. Kishk ; H.A. Auda ; B.C. Ahn
- Source: Electronics Letters, Volume 23, Issue 25, p. 1374 –1375
- DOI: 10.1049/el:19870948
- Type: Article
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p.
1374
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The radiation patterns of cylindrical dielectric resonator antennas excited with a TM11 mode is computed numerically. The numerical data obtained is found in good agreement with available experimental results. The symmetry of the radiation patterns is improved by reducing the ground plane dimensions, while the backlobe level is reduced by placing the antenna in a topless cylindrical cavity.
Relationship between linewidth and chirp reductions in gain-detuned composite-cavity semiconductor lasers
- Author(s): P. Gallion and G. Debarge
- Source: Electronics Letters, Volume 23, Issue 25, p. 1375 –1376
- DOI: 10.1049/el:19870949
- Type: Article
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Detuned gain and composite cavity frequency response are two structural sources of amplitude-phase coupling which both need to be considered in addition to the material Henry factor. The spontaneous emission rate dependence on the composite cavity bandwidth is also taken into account to calculate the linewidth and chirp reduction factors.
Accuracy of standard patch antenna models
- Author(s): T.M. Willis and D.L. Sengupta
- Source: Electronics Letters, Volume 23, Issue 25, p. 1376 –1378
- DOI: 10.1049/el:19870950
- Type: Article
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The validity of the leaky cavity and transmission-line models to predict the far zone fields from a microstrip patch antenna is investigated. The prediction of this radiation requires a knowledge of the total current on the antenna. Since the approximate techniques utilise only the current on the bottom surface of the antenna, the relative importance of top and bottom surface currents are examined.
Phase-matched mode convertor in LiNbO3 using near-Z-axis propagation
- Author(s): A. Donaldson and K.K. Wong
- Source: Electronics Letters, Volume 23, Issue 25, p. 1378 –1379
- DOI: 10.1049/el:19870951
- Type: Article
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A phase-matched TE↔TM mode convertor, where the requirement for a birefringence tuning voltage is removed, is demonstrated in Y-cut LiNbO3. The direction of propagation is at 2° to the Z-axis where the sense of this angle is chosen not only to remove the residual waveguide birefringence but to improve the efficiency of the electro-optic interaction.
Design of crystal oscillators with fundamental frequencies in the uhf and microwave regions
- Author(s): G. Gonzalez and B. Avanic
- Source: Electronics Letters, Volume 23, Issue 25, p. 1379 –1381
- DOI: 10.1049/el:19870952
- Type: Article
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A negative resistance approach is used to design a crystal oscillator whose fundamental resonance is at f0 = 842911MHz. The SSB phase noise measurements of the crystal oscillator show great potential for the development of stable frequency sources in the UHF and microwave regions.
Considerations on group delay fitting equations for dispersion-shifted fibres
- Author(s): Y. Miyajima ; T. Kawata ; Y. Negishi
- Source: Electronics Letters, Volume 23, Issue 25, p. 1381 –1382
- DOI: 10.1049/el:19870953
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Chromatic dispersion measurement accuracy was examined experimentally for four kinds of group delay fitting equation which have been proposed to date. It was found that the five-term Sellmeier equation is appropriate for dispersion-shifted fibres with various refractive index profiles. Also, it was demonstrated that the maximum difference in zero-dispersion wavelength among the four equations is less than 0.67nm by selecting six measuring wavelengths between 1.49μm and 1.59μm using the LD phase-shift method.
Polarisation-insensitive operation of coherent FSK transmission system using polarisation diversity
- Author(s): S. Ryu ; S. Yamamoto ; K. Mochizuki
- Source: Electronics Letters, Volume 23, Issue 25, p. 1382 –1384
- DOI: 10.1049/el:19870954
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Dynamic operation of an optical polarisation diversity receiver with a square-law baseband combining technique in the FSK system is demonstrated experimentally. It is confirmed that this scheme shows almost the same operation as the optimum maximal-ratio combining technique.
High-frequency acousto-optic deflector using ZnO thin films deposited on an amorphous substrate
- Author(s): J. Chang ; N. Harada ; S. Kashiwa
- Source: Electronics Letters, Volume 23, Issue 25, p. 1384 –1385
- DOI: 10.1049/el:19870955
- Type: Article
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c-axis-oriented ZnO thin films were deposited on Corning 7059 glasses by RF magnetron sputtering. 230 MHz-bandwidth acousto-optic deflector was achieved by using this ZnO film. The propagation loss of the surface-acoustic wave in ZnO films was about 20dB/cm at the acoustic frequency of 630 MHz.
Wavelength dependence of a D-fibre optical switch
- Author(s): S.A. Cassidy and P. Yennadhiou
- Source: Electronics Letters, Volume 23, Issue 25, p. 1385 –1387
- DOI: 10.1049/el:19870956
- Type: Article
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Fully transparent optical networks require both highly wavelength-selective devices and wavelength-independent devices to transmit, switch and select bandwidth. Coupled waveguide devices in various forms have been fabricated to meet many of these network functions. We present here a substantially wavelength-independent space switch realised with D-fibres.
Optical amplifier configurations with low polarisation sensitivity
- Author(s): G. Grobkopf ; R. Ludwig ; R.G. Waarts ; H.G. Weber
- Source: Electronics Letters, Volume 23, Issue 25, p. 1387 –1388
- DOI: 10.1049/el:19870957
- Type: Article
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The sensitivity of optical amplifiers to signal polarisation is avoided with use of configurations in which two amplifiers are combined. We describe experiments with a series and a parallel arrangement of two optical amplifiers. The experiments demonstrate a polarisation-insensitive amplification for both configurations over a spectral range of at least 80 GHz.
Objective measurement of receiver sensitivity
- Author(s): B.A. Wyndham and T.B. Nichols
- Source: Electronics Letters, Volume 23, Issue 25, p. 1388 –1389
- DOI: 10.1049/el:19870958
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The sensitivity of radar receivers is checked with a pulsed radio frequency signal which is adjusted until the observed magnitude is distinguishable from the background noise level as displayed on an oscilloscope. Because of the noisy nature of the display the results are highly subjective, but by eliminating the idiosyncratic element, a calibration instrument has been designed to give a rapid and accurate presentation to the operator.
New channel routing algorithm for bit-slice applications
- Author(s): S. Nagara ; S.G. Smith ; P.B. Denyer ; M. Keightley
- Source: Electronics Letters, Volume 23, Issue 25, p. 1389 –1391
- DOI: 10.1049/el:19870959
- Type: Article
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A new algorithm for channel routing is presented which addresses the special problems of bit-slice architectural assembly, namely the broadcasting and cascading of signals through layout slices. This is achieved by end-on abutment of channels. The method, used in the bit-slice assembler Slicesyn, is based on a heuristic approach using graph theory.
Comparison of phase modulation of GaAs/AlGaAs double heterostructures
- Author(s): J. Faist ; F.K. Reinhart ; D. Martin
- Source: Electronics Letters, Volume 23, Issue 25, p. 1391 –1392
- DOI: 10.1049/el:19870960
- Type: Article
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The performance of double-heterostructure GaAs/AlxGa1−xs phase modulators with different doping profiles are systematically compared. The largest phase modulation of l.75rad/V mm at a wavelength of 1.09μm was obtained with an active layer doped at n=3 × 1017cm−3. However, an intrinsic active layer gives the lowest characteristic modulation energy needed for high-frequency modulation.
Intermodulation distortion in optical amplifiers from carrier-density modulation
- Author(s): T.E. Darcie ; R.M. Jopson ; R.W. Tkach
- Source: Electronics Letters, Volume 23, Issue 25, p. 1392 –1394
- DOI: 10.1049/el:19870961
- Type: Article
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We present a theoretical model describing the generation of intermodulation products (IMPs) in semiconductor optical amplifiers by signal-induced carrier-density modulation. The IMPs depend strongly on the linewidth-enhancement factor and the ratio of output intensity to the saturation intensity of the amplifier. Calculation of the total intermodulation penalty for multichannel amplifier applications is possible using the expressions presented.
Measurement of carrier-density mediated intermodulation distortion in an optical amplifier
- Author(s): R.M. Jopson ; T.E. Darcie ; K.T. Gayliard ; R.T. Ku ; R.E. Tench ; T.C. Rice ; N.A. Olsson
- Source: Electronics Letters, Volume 23, Issue 25, p. 1394 –1395
- DOI: 10.1049/el:19870962
- Type: Article
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We measured intermodulation distortion (IMD) generated by the presence of two optical tones separated by up to 1 GHz in a 1.3μm near-travelling-wave optical amplifier. The measured distortion agrees with calculations of third-order nonlinearity caused by carrier-density modulation. The third-order intercept of 5dBm may be more restrictive in closely spaced frequency-multiplexed systems than gain saturation.
High-power operation of long-cavity phase-locked laser arrays
- Author(s): T. Aoyagi ; S. Hinata ; K. Shigihara ; Y. Seiwa ; K. Ikeda ; W. Susaki
- Source: Electronics Letters, Volume 23, Issue 25, p. 1396 –1397
- DOI: 10.1049/el:19870963
- Type: Article
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A CW light output power of 570 mW at 0.81μm wavelength has been obtained on long-cavity, phase-locked laser arrays with five stripes. The median lifetime of the arrays for 100 mW CW operation was approximately 3000 h at 50°C, which corresponds to approximately 25 000 h at 25°C.
Erratum: New analysis of LED to single-mode fibre coupling
- Author(s): B. Hillerich
- Source: Electronics Letters, Volume 23, Issue 25, page: 1397 –1397
- DOI: 10.1049/el:19870964
- Type: Article
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Erratum: Finite-element solution of arbitrarily nonlinear, graded-index slab waveguides
- Author(s): K. Hayata ; M. Koshiba ; M. Suzuki
- Source: Electronics Letters, Volume 23, Issue 25, page: 1397 –1397
- DOI: 10.1049/el:19870965
- Type: Article
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Erratum: Open-cavity resonator as high-Q microstrip circuit element
- Author(s): K.D. Stephan and S.L. Young
- Source: Electronics Letters, Volume 23, Issue 25, page: 1397 –1397
- DOI: 10.1049/el:19870966
- Type: Article
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Erratum: Analysis of a narrow slit in a parallel-plate transmission line: E-polarisation case
- Author(s): Young Ki Cho
- Source: Electronics Letters, Volume 23, Issue 25, page: 1397 –1397
- DOI: 10.1049/el:19870967
- Type: Article
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Erratum: Block-diagonal structure of Walsh-Hadamard/discrete cosine transform
- Author(s): Chau-Yun Hsu and Ja-Ling Wu
- Source: Electronics Letters, Volume 23, Issue 25, page: 1397 –1397
- DOI: 10.1049/el:19870968
- Type: Article
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Erratum: Differential phase error in pulse-width-modulated TV transmission systems
- Author(s): B. Wilson and Z. Ghassemlooy
- Source: Electronics Letters, Volume 23, Issue 25, page: 1397 –1397
- DOI: 10.1049/el:19870969
- Type: Article
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Erratum: CMOS circuits made in thin SIMOX films
- Author(s): J.P. Colinge and T.I. Kamins
- Source: Electronics Letters, Volume 23, Issue 25, page: 1397 –1397
- DOI: 10.1049/el:19870970
- Type: Article
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Erratum: Resistance of Ti:LiNbO3 devices to ionising radiation
- Author(s): E.I. Drummond
- Source: Electronics Letters, Volume 23, Issue 25, page: 1397 –1397
- DOI: 10.1049/el:19870971
- Type: Article
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