Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 22, 31 October 1974
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Volume 10, Issue 22
31 October 1974
Optical-fibre waveguide with a single-crystal core
- Author(s): J.L. Stevenson and R.B. Dyott
- Source: Electronics Letters, Volume 10, Issue 22, p. 449 –450
- DOI: 10.1049/el:19740356
- Type: Article
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–450
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Some properties of a new single-crystal optical fibre are described. The fibre is constructed with the nonlinear optical crystal meta-nitroaniline as its core. In its present configuration, the fibre acts as an effective polariser. Alternative configurations may yield a number of electro-optic fibre devices.
Optical properties of sodium-borosilicate glass fibres
- Author(s): C.R. Day ; J.E. Midwinter ; G.R. Newns ; R.W.J. Uffen ; R. Worthington
- Source: Electronics Letters, Volume 10, Issue 22, p. 450 –451
- DOI: 10.1049/el:19740357
- Type: Article
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p.
450
–451
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Sodium-borosilicate glasses have been converted into fibres, with very small incremental optical loss.
Pyroelectric thermal image tube
- Author(s): H.A.H. Boot and J.G. Castledine
- Source: Electronics Letters, Volume 10, Issue 22, page: 452 –452
- DOI: 10.1049/el:19740358
- Type: Article
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An image tube based on the electron-mirror principle and with a pyroelectric target has been developed for operation in the 8–14 μm-wavelength region. The sensitivity is sufficient to detect temperature differences in the scene of 1 deg K.
Sensitivity of equivalent networks
- Author(s): J. Neirynck and P. van Bastelaer
- Source: Electronics Letters, Volume 10, Issue 22, p. 452 –453
- DOI: 10.1049/el:19740359
- Type: Article
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Constant-coefficient linear transformations are discussed.
Measurement of the effect of injected carriers on the p-n refractive-index step in single heterostructure diode lasers
- Author(s): P.R. Selway ; G.H.B. Thompson ; G.D. Henshall ; J.E.A. Whiteaway
- Source: Electronics Letters, Volume 10, Issue 22, p. 453 –455
- DOI: 10.1049/el:19740360
- Type: Article
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–455
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Far-field emission patterns of GaAs/GaxAl1-x As single heterostructure lasers have been measured over a range of temperature and threshold currents. The pattern width decreases as the threshold increases, which can be interpreted as a reduction of the p-n refractive-index step, owing to the effect of the injected carriers. A quantitative estimate of this effect has been obtained.
Simple circuit for computing (x2 + y2)½
- Author(s): J.S.C. Tan
- Source: Electronics Letters, Volume 10, Issue 22, p. 455 –456
- DOI: 10.1049/el:19740361
- Type: Article
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p.
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–456
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A simple, effective and inexpensive circuit for computing the phasor sum of two perpendicular vectors is described. Basically, it relies on exploiting the orthogonal property of trigonometric functions to carry out the computation. Being discrete in nature, the technique is particularly suitable for instrumentation and sampled-data control applications.
Role of optical guiding in critical-temperature behaviour, delays and q switching in single hetero-structure GaAs/(GaAl)as lasers
- Author(s): G.H.B. Thompson ; P.R. Selway ; G.D. Henshall ; J.E.A. Whiteaway
- Source: Electronics Letters, Volume 10, Issue 22, p. 456 –457
- DOI: 10.1049/el:19740362
- Type: Article
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The sharp increase in threshold current in single hetero-structure lasers around the critical temperature Tc has been found to be quantitatively related to the measured loss of optical confinement caused by injected carriers. Using this relation, laser quenching below Tc, Q switching and anomalous delays can be attributed, respectively, to catastrophic loss of confinement, momentary restoration of confinement and the interaction of saturable absorbers with the confinement change.
Design considerations for shaped-beam reflectors
- Author(s): S.S. Bhave ; S.H. Damle ; S.M. Prasad
- Source: Electronics Letters, Volume 10, Issue 22, p. 457 –459
- DOI: 10.1049/el:19740363
- Type: Article
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A modified procedure is proposed for the design of shaped-beam reflectors in general. The procedure involves explicitly the size of the reflector as a parameter and can thus be used to check quickly the minimum size of a reflector needed for a given shaped beam. Experimental results are given for a reflector designed on this basis.
Mode conversion due to tilts in multimode optical fibre
- Author(s): P.L. Chu
- Source: Electronics Letters, Volume 10, Issue 22, p. 459 –460
- DOI: 10.1049/el:19740364
- Type: Article
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p.
459
–460
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Coupled-mode theory is used to study the mode-conversion phenomenon due to a tilt in a multimode fibre. It is shown that there exists a critical angle beyond which power tends to be uniformly distributed among a large number of modes. This critical angle decreases with the increase in the number of modes in the fibre.
Ternary Barker codes
- Author(s): P.S. Moharir
- Source: Electronics Letters, Volume 10, Issue 22, p. 460 –461
- DOI: 10.1049/el:19740365
- Type: Article
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–461
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Certain ternary codes having good autocorrelation properties akin to Barker codes are described.
Short antenna with active inductance
- Author(s): P.K. Rangole and S.S. Midha
- Source: Electronics Letters, Volume 10, Issue 22, p. 462 –463
- DOI: 10.1049/el:19740366
- Type: Article
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–463
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It has been found that integration of an active inductance with a short antenna gives higher antenna gains over a relatively wide frequency range. The gain of this system can be further improved by integrating a suitable wideband amplifier with it.
Temperature compensation of Gunn oscillators
- Author(s): R. Stevens and F.A. Myers
- Source: Electronics Letters, Volume 10, Issue 22, p. 463 –464
- DOI: 10.1049/el:19740367
- Type: Article
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p.
463
–464
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Two mechanically simple techniques are described for improving the temperature stability of Gunn oscillators. The ease of operation of relatively low-Q factor systems is maintained, making these particularly useful for pulsed oscillators.
Enhancement of bandwidth and additional loss caused by controlled mode coupling in quartz fibres
- Author(s): S. Geckeler and D. Schicketanz
- Source: Electronics Letters, Volume 10, Issue 22, page: 465 –465
- DOI: 10.1049/el:19740368
- Type: Article
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Controlled mode coupling is applied to a 1 km quartz multimode fibre. Bandwidth and associated increase in loss, and the time relation between pulses with and without mode coupling, are reported.
Current-controlled oscillator
- Author(s): R. Sharma and T.R. Viswanathan
- Source: Electronics Letters, Volume 10, Issue 22, p. 466 –467
- DOI: 10.1049/el:19740369
- Type: Article
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–467
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A relaxation oscillator whose frequency is linearly related to an input control current is described. The circuit configuration is based on the emitter-coupled astable multivibrator. The linear frequency variation is obtained by incorporating a discriminator circuit and high-transconductance elements into the oscillator circuit. Experimental results obtained from a circuit constructed from monolithic transistor arrays indicate that frequency variation over two decades, with a linearity better than 0.1%, can be obtained.
Permutation-decodable binary cyclic codes
- Author(s): Pui-Wah Yip ; S.G.S. Shiva ; E.L. Cohen
- Source: Electronics Letters, Volume 10, Issue 22, p. 467 –468
- DOI: 10.1049/el:19740370
- Type: Article
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–468
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The letter develops bounds on the information rates of certain binary cyclic codes so that they are s-step permutation decodable (s=2, 3, 4).
Erratum: Negabinary carry-look-ahead adder and fast multiplier
- Author(s): D.P. Agrawal
- Source: Electronics Letters, Volume 10, Issue 22, page: 468 –468
- DOI: 10.1049/el:19740371
- Type: Article
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Erratum: Propagation in two circular coaxial waveguides
- Author(s): I.I. Rabinowitz and J.A. Staniforth
- Source: Electronics Letters, Volume 10, Issue 22, page: 468 –468
- DOI: 10.1049/el:19740372
- Type: Article
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