Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 18, Issue 23, 11 November 1982
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Volume 18, Issue 23
11 November 1982
Transimpedance optical preamplifier having a common-collector front end
- Author(s): M.J.N. Sibley and R.T. Unwin
- Source: Electronics Letters, Volume 18, Issue 23, p. 985 –986
- DOI: 10.1049/el:19820673
- Type: Article
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p.
985
–986
(2)
A simple PIN photodiode-bipolar transistor (PIN-BJT), direct-coupled, transimpedance, optical preamplifier suitable for fabrication in monolithic IC form is described. The preamplifier basically consists of a common-collector, common-emitter configuration with shunt feedback. Measurements indicate that the receiver is capable of a sensitivity of −35.8 dBm at 140 Mbit/s for an error rate of 10−9.
Locking bandwidth asymmetry in injection-locked GaAlAs lasers
- Author(s): L. Goldberg ; H.F. Taylor ; J.F. Weller
- Source: Electronics Letters, Volume 18, Issue 23, p. 986 –987
- DOI: 10.1049/el:19820674
- Type: Article
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p.
986
–987
(2)
The centre of the locking frequency range of a GaAlAs laser is found to shift to longer wavelengths with increasing injected power by an amount proportional to the square root of the injected power level. These observations are in good agreement with predictions based on an analysis relating equilibrium photon and carrier densities in the laser cavity.
Dielectric constant of semi-insulating indium phosphide
- Author(s): R.E. Neidert ; S.C. Binari ; T. Weng
- Source: Electronics Letters, Volume 18, Issue 23, p. 987 –988
- DOI: 10.1049/el:19820675
- Type: Article
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p.
987
–988
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Results are given on precision measurements of the relative dielectric constant of semi-insulating indium phosphide. It is concluded that the static value is within less than 0.5% of 12.55 based on a statistical average of a large number of measurements on several material samples.
Comment: Algorithm for finding the common spanning trees of two graphs
- Author(s): S.R. Schach
- Source: Electronics Letters, Volume 18, Issue 23, p. 988 –989
- DOI: 10.1049/el:19820676
- Type: Article
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988
–989
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Reply: Algorithm for finding the common spanning trees of two graphs
- Author(s): J.B. Grimbleby
- Source: Electronics Letters, Volume 18, Issue 23, page: 989 –989
- DOI: 10.1049/el:19820677
- Type: Article
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989
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Evidence of fundamental mode cutoff in depressed inner cladding single-mode fibres
- Author(s): P. Sansonetti ; F. Alard ; C. Vassallo ; P. Kammerer ; P.L. Francois ; M. Monerie ; J.M. Gabriagues ; P. Dupont
- Source: Electronics Letters, Volume 18, Issue 23, p. 989 –990
- DOI: 10.1049/el:19820678
- Type: Article
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p.
989
–990
(2)
We report experimental evidence of fundamental mode cutoff in depressed inner cladding single-mode fibres. It is characterised by a sharp decrease in the transmission curve and by a local increase of the fundamental mode spot size. Both phenomena are theoretically explained.
Far field radiated by rectangular patch microstrip antenna
- Author(s): G. Dubost
- Source: Electronics Letters, Volume 18, Issue 23, p. 991 –993
- DOI: 10.1049/el:19820679
- Type: Article
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991
–993
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Using the volume equivalence theorem, we introduce electric and polarisation current distributions for a rectangular patch microstrip antenna. These distributions are known from transmission-line-model analysis. Literal formulas are given especially to express the E-plane radiation pattern and the worst-case crosspolarisation level. Theoretical results are in good agreement with experiments.
Optimal scalar Lyapunov functions for decentralised stabilisation of interconnected systems
- Author(s): H.M. Soliman and R.J. Fleming
- Source: Electronics Letters, Volume 18, Issue 23, p. 993 –994
- DOI: 10.1049/el:19820680
- Type: Article
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993
–994
(2)
The problem of stabilisation of interconnected linear systems is considered by means of scalar Lyapunov functions and aggregation. A sufficient condition is given for an interconnected system to be stabilised using only local state feedback. The aim is to provide the least restrictive condition possible, which is termed ‘optimal’, by properly choosing the state-variable weighting matrices for each subsystem.
New computation method for characteristic modes
- Author(s): A. Haluk Nalbantoğlu
- Source: Electronics Letters, Volume 18, Issue 23, p. 994 –996
- DOI: 10.1049/el:19820681
- Type: Article
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p.
994
–996
(3)
To compute the characteristic modes of a perfectly conducting object a new weighted eigenvalue equation is derived, using the magnetic-field integral equation. The method of moments is used to solve this eigenvalue equation, and a number of bodies of revolution are examined. The results are presented and compared with those of previous methods.
Suboptimal control with incomplete state feedback
- Author(s): C.P. Therapos
- Source: Electronics Letters, Volume 18, Issue 23, p. 996 –997
- DOI: 10.1049/el:19820682
- Type: Article
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p.
996
–997
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A simple method is presented to compute a suboptimal partial-state-feedback control law, based on a suitable approximation of the optimal complete-state-feedback case. A parameter is also available to stabilise the resulting closed-loop system.
Splicing of single-polarisation fibres by an optical short-pulse method
- Author(s): Y. Sasaki ; N. Shibata ; J. Noda
- Source: Electronics Letters, Volume 18, Issue 23, p. 997 –999
- DOI: 10.1049/el:19820683
- Type: Article
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p.
997
–999
(3)
Arc-fusion splicing of 2.1 km-long single-polarisation fibres with stress-induced birefringence is performed using mode-locked YAG laser pulses. By monitoring the pulse shapes due to the polarisation dispersion, alignment for the parallel or the crossprincipal axes of the core refractive-index ellipsoid is easily realised.
Fibre-optic variable delay lines
- Author(s): J.E. Bowers ; S.A. Newton ; H.J. Shaw
- Source: Electronics Letters, Volume 18, Issue 23, p. 999 –1000
- DOI: 10.1049/el:19820684
- Type: Article
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999
–1000
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A technique is presented for fabricating large numbers of evanescently coupled taps on a single-mode fibre. An output fibre can be adjusted between any of the taps, resulting in a discretely variable delay. The concept was demonstrated with a 7 tap device which had a 2.5 ns delay between taps and a tap uniformity of ± 1.6 dB. A technique for making continuously variable delay lines is presented.
Numerical analysis of shielded dielectric resonators including substrate, support disc and tuning post
- Author(s): U.S. Hong and R.H. Jansen
- Source: Electronics Letters, Volume 18, Issue 23, p. 1000 –1002
- DOI: 10.1049/el:19820685
- Type: Article
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p.
1000
–1002
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An efficient numerical technique and computer program has been developed for the determination of the resonant frequencies and field coefficients of cylindrical dielectric disc resonators in a configuration which models the various effects present in real technical applications. It accounts for the influences due to shielding, planar circuit substrate, dielectric support and a dielectric post used to tune out fabrication tolerances.
New technique for wavefront distortion compensation of apodised interdigital transducers
- Author(s): W. Soluch
- Source: Electronics Letters, Volume 18, Issue 23, p. 1002 –1003
- DOI: 10.1049/el:19820686
- Type: Article
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p.
1002
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It is shown that in an apodised SAW interdigital transducer the inactive areas, where periodic electrodes do not overlap, can be replaced by a continuous metallisation. In the case of YZ LiNbO3, wavefront distortion compensation is achieved when the ratio of the metallisation length to the inactive area length is equal to about 0.8.
Nondestructive film thickness measurement on industrial diamond
- Author(s): R.D. Weglein
- Source: Electronics Letters, Volume 18, Issue 23, p. 1003 –1004
- DOI: 10.1049/el:19820687
- Type: Article
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p.
1003
–1004
(2)
The surface-acoustic wave velocities on type IIA diamond, with and without a 1 μm-thick Au film, sputter deposited on one surface, were measured using an acoustic microscope at 50 MHz. From a computed SAW dispersion curve, the Aufilm thickness is inferred. There are high-frequency restrictions for this technique.
Vector quantiser of video signals
- Author(s): T. Murakami ; K. Asai ; E. Yamazaki
- Source: Electronics Letters, Volume 18, Issue 23, p. 1005 –1006
- DOI: 10.1049/el:19820688
- Type: Article
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p.
1005
–1006
(2)
An efficient design method is presented for a vector quantiser of 16-dimensional vectors based on a long training sequence of normalised video signals. The basic properties are demonstrated by examples.
New 1.5 μm wavelength GaInAsp/InP distributed feedback laser
- Author(s): Y. Itaya ; T. Matsuoka ; Y. Nakano ; Y. Suzuki ; K. Kuroiwa ; T. Ikegami
- Source: Electronics Letters, Volume 18, Issue 23, p. 1006 –1008
- DOI: 10.1049/el:19820689
- Type: Article
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p.
1006
–1008
(3)
A new 1.5 μm-wavelength GalnAsP/InP distributed feedback buried-heterostructure laser was fabricated by a three-step LPE growth process. The second-order corrugation grating was formed on the waveguide layer grown on the active layer. High differential quantum efficiency of 13%/facet was obtained. Single-longitudinal-mode operation in the temperature range from −20°C to 55°C was obtained.
Comparison between techniques for measuring the LP11-mode cutoff wavelength in monomode fibres
- Author(s): P.D. Nichols
- Source: Electronics Letters, Volume 18, Issue 23, p. 1008 –1009
- DOI: 10.1049/el:19820690
- Type: Article
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p.
1008
–1009
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The LP11-mode cutoff wavelength λc of a monomode fibre can be obtained by measuring changes in microbending loss or mode field width. These two methods have been compared and it was found that the presence of microbending in the latter technique resulted in a discrepancy of between 0.04 and 0.12 μm in the measurement of λc.
Comment: System reduction by Cauer continued-fraction expansion about s=a and s=∞ alternately
- Author(s): J. Pal
- Source: Electronics Letters, Volume 18, Issue 23, p. 1009 –1010
- DOI: 10.1049/el:19820691
- Type: Article
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1009
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Reply: System reduction by Cauer continued-fraction expansion about s=a and s=∞ alternately
- Author(s): R. Parthasarathy
- Source: Electronics Letters, Volume 18, Issue 23, page: 1010 –1010
- DOI: 10.1049/el:19820692
- Type: Article
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1010
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Parallel-planes approximation for propagation in rectangular tunnels
- Author(s): B. Jacard ; A. Valenzuela ; O. Maldonado
- Source: Electronics Letters, Volume 18, Issue 23, p. 1011 –1012
- DOI: 10.1049/el:19820693
- Type: Article
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1011
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Natural propagation of electromagnetic waves in rectangular tunnels is analysed using parallel lossy planes approximations with no restrictions on the electrical properties of the walls. The analysis provides a better understanding of the physical characteristics of the low-order modes as a function of frequency. Numerical results are compared satisfactorily with published measurements.
Raindrop size distribution from microwave scattering measurements in equatorial and tropical climates
- Author(s): F. Moupfouma and J. Tiffon
- Source: Electronics Letters, Volume 18, Issue 23, p. 1012 –1014
- DOI: 10.1049/el:19820694
- Type: Article
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1012
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A raindrop size time averaged distribution is inferred from an indirect method by using measurements of attenuation due to rain in Congo (equatorial and tropical climates). Attenuations calculated from this distribution are compared with experimental data gathered on the Ivory Coast (tropical climate) at a different frequency.
Further results on maximally flat nonrecursive digital filters
- Author(s): M.U.A. Bromba and H. Ziegler
- Source: Electronics Letters, Volume 18, Issue 23, p. 1014 –1015
- DOI: 10.1049/el:19820695
- Type: Article
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p.
1014
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Starting with the Krawtchouk series representation of maximally flat FIR lowpass filters, a class of monotone bandpass filters is derived and exact design formulas are given.
Astigmatism of semiconductor lasers with cosh−2 (x) profile of gain
- Author(s): J. Pietzsch
- Source: Electronics Letters, Volume 18, Issue 23, p. 1015 –1017
- DOI: 10.1049/el:19820696
- Type: Article
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The distance of the virtual source of the laser output beam from the mirror is calculated by treating the radiation far field for which an analytical representation is given. The results show that for typical narrow-stripe gain-guided lasers the astigmatism is much stronger than would be obtained with a cylindrical phase-front approximation.
Digital method of sweep frequency generation
- Author(s): J.J. Hill and P.M. Jewson
- Source: Electronics Letters, Volume 18, Issue 23, p. 1017 –1019
- DOI: 10.1049/el:19820697
- Type: Article
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p.
1017
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A digital method of sweep frequency generation is described whereby a crystal-controlled clock and programmable divider unit are used to obtain the desired sweep frequency output. The circuit gives four decades of exponential or linear sweep between 10 Hz and 100 kHz.
FM sideband injection locking of diode lasers
- Author(s): L. Goldberg ; H.F. Taylor ; J.F. Weller
- Source: Electronics Letters, Volume 18, Issue 23, p. 1019 –1020
- DOI: 10.1049/el:19820698
- Type: Article
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1019
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The injection locking of a laser diode to FM sidebands of a second, modulated laser has been investigated. Locking to sidebands as far as 9.5 GHz removed from the fundamental lasing frequency was observed.
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