Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 13, Issue 25, 8 December 1977
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Volume 13, Issue 25
8 December 1977
Grating-coupled GaAs-GaAlAs lasers with distributed Bragg reflectors
- Author(s): Y. Uematsu ; M. Yamamoto ; Y. Unno
- Source: Electronics Letters, Volume 13, Issue 25, p. 759 –760
- DOI: 10.1049/el:19770536
- Type: Article
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p.
759
–760
(2)
Grating-coupled GaAs-GaAIAs lasers with 4th-order distributed Bragg reflectors have been successfully demonstrated with high efficiencies. The threshold current density, lasing spectrum and grating-coupled output power have been measured at room temperature. The output power from the grating at 1.5 Jth and its differential quantum efficiency have been measured to be 13.5 mW and 1.1%, respectively.
Acoustic sensitivity of optical-fibre waveguides
- Author(s): B. Culshaw ; D.E.N. Davies ; S.A. Kingsley
- Source: Electronics Letters, Volume 13, Issue 25, p. 760 –761
- DOI: 10.1049/el:19770537
- Type: Article
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p.
760
–761
(2)
The letter describes the interaction between coherent light propagating along an optical fibre and an acoustic wave incident on the fibre. The pressure sensitivity of a single-mode fibre is such that it may be used as a sensitive microphone with a very wide dynamic range. The corresponding effect in multimode fibres is a much more complex process, resulting in a reduction in both sensitivity and linearity. Experimental measurements of the sensitivity are in sensible agreement with the theoretical predictions.
Microwave capability of 1.5 μm-gate GaAs m.o.s.f.e.t.
- Author(s): Hirokuni Tokuda ; Yoshio Adachi ; Toshiaki Ikoma
- Source: Electronics Letters, Volume 13, Issue 25, p. 761 –763
- DOI: 10.1049/el:19770538
- Type: Article
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p.
761
–763
(3)
1.5 μm-gate GaAs m.o.s.f.e.t.s have been fabricated by anodic oxidation, and the microwave capability has been examined. The maximum oscillation frequency fmax is 22 GHz and the noise figure is 6.1 dB at 8 GHz. The results are comparable to those of GaAs m.e.s.f.e.t.s.
Fast fabrication method for thick and highly multimode optical waveguides
- Author(s): G.H. Chartier ; P. Jaussaud ; A.D. de Oliveira ; O. Parriaux
- Source: Electronics Letters, Volume 13, Issue 25, p. 763 –764
- DOI: 10.1049/el:19770539
- Type: Article
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p.
763
–764
(2)
A eutectic melt of lithium and potassium sulphates was used to fabricate thick, low-loss and highly multimode waveguides by ion exchange in glass.
Multiplexer at 5 Gbit/s for fibre-optical communication systems
- Author(s): R. Tell ; Y. Torphammar ; S.T. Eng
- Source: Electronics Letters, Volume 13, Issue 25, p. 765 –766
- DOI: 10.1049/el:19770540
- Type: Article
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p.
765
–766
(2)
A 5 Cbit/s multiplexer using a step-recovery diode, microstrip transmission delay lines and fast p-i-n diode switches has been investigated. The signal/distortion ratio is 12 dB, where most of the distortion is due to an imperfect input signal. The overall multiplexer seems to be simple enough to be adopted in highcapacity optical-fibre communication systems.
Transverse light coupling from GaAs lasers into optical fibres
- Author(s): C.C. Timmermann
- Source: Electronics Letters, Volume 13, Issue 25, p. 766 –767
- DOI: 10.1049/el:19770541
- Type: Article
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p.
766
–767
(2)
We report a method for transverse light coupling from GaAs lasers into optical fibres. The fibre end is positioned perpendicular to the laser-beam direction and is cut at the end under 45° to reflect the laser radiation. We measured 10% coupling efficiency for a plastics fibre which was simply cut by a blade. We used this method for an automatic-gain-control circuit and picked up reference light from the back side of a d.h. laser.
Power loss caused by random mode coupling in a multimode optical fibre
- Author(s): K. Tatekura ; Y. Itoh ; T. Matsumoto
- Source: Electronics Letters, Volume 13, Issue 25, p. 767 –768
- DOI: 10.1049/el:19770542
- Type: Article
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p.
767
–768
(2)
A method is presented for calculating the effects of random mode coupling in a multimode optical fibre. The calculated results are in good agreement with the experiment, and the relative error in the steady-state power loss is about 1%.
Nonlinear effects in coaxial cables at microwave frequencies
- Author(s): M.B. Amin and I.A. Benson
- Source: Electronics Letters, Volume 13, Issue 25, p. 768 –770
- DOI: 10.1049/el:19770543
- Type: Article
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p.
768
–770
(3)
A study of the generation of intermodulation products due to nonlinearities in braided coaxial cables at L-, S-and C-band frequencies is in progress and some results are presented. The different cable parameters responsible for intermodulation products at microwave frequencies have been examined and their relative contributions towards the total nonlinearities assessed.
High-speed modulo-3 generator
- Author(s): D.D. Gajski and C. Vora
- Source: Electronics Letters, Volume 13, Issue 25, p. 770 –772
- DOI: 10.1049/el:19770544
- Type: Article
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p.
770
–772
(3)
A circuit that generates residues modulo 3 in logarithmic time has been implemented with nonsaturated logic. It is modular and can be easily expanded to accommodate words of any length. It is used for error detection in high-speed arithmetic units.
Addressing in radio paging
- Author(s): P.J. Mabey
- Source: Electronics Letters, Volume 13, Issue 25, page: 772 –772
- DOI: 10.1049/el:19770545
- Type: Article
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p.
772
(1)
A technique of batching calls in radio paging reduces pager power consumption and increases performance with no increase in decoder complexity.
Digital phase-shift generator
- Author(s): G.L. Gooberman and J. Ainscough
- Source: Electronics Letters, Volume 13, Issue 25, p. 772 –773
- DOI: 10.1049/el:19770546
- Type: Article
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p.
772
–773
(2)
A digital phase shifter is described which generates two square waves whose phase shift can be set in multiples of 22.5° and which can have an accuracy of ±0.2° at 1 MHz.
Identification of e.m. spectrum by known pole sets
- Author(s): E.K. Miller ; J.N. Brittingham ; J.L. Willows
- Source: Electronics Letters, Volume 13, Issue 25, p. 774 –775
- DOI: 10.1049/el:19770547
- Type: Article
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p.
774
–775
(2)
A procedure for obtaining the e.m. poles of an object from its frequency-domain transfer function is applied to the scattered fields of three shiplike wire models. The possibility for identifying a particular ship model in the set of three from its pole set is examined.
Groove guide as a low-loss transmission system for short millimetric waves
- Author(s): D.J. Harris and K.W. Lee
- Source: Electronics Letters, Volume 13, Issue 25, p. 775 –776
- DOI: 10.1049/el:19770548
- Type: Article
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p.
775
–776
(2)
Groove guide promises low-loss transmission at short millimetric wavelengths, coupled with simple construction and convenient dimensions. Even though the guide is of overmoded dimensions, the groove acts as a higher-order-mode filter. Approximate analytical solutions are shown to be adequate to give sufficiently accurate propagation characteristics. Higher-mode suppression is investigated and shown to be effective at 8 mm wavelength.
Image enhancement in the scanning acoustic microscope using analogue filters
- Author(s): H.K. Wickramasinghe and J. Heiserman
- Source: Electronics Letters, Volume 13, Issue 25, p. 776 –777
- DOI: 10.1049/el:19770549
- Type: Article
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p.
776
–777
(2)
A simple technique is described for enhancing the images in the scanning acoustic microscope. The technique involves passing the video signal through analogue filters prior to recording the image. The resulting images bring out detail which would otherwise be difficult to observe in regular acoustic micrographs.
Experimental comparison between induced surface current and scattered electromagnetic waves for a metal target with time-varying characteristics
- Author(s): A.J. Bahr and J.P. Petro
- Source: Electronics Letters, Volume 13, Issue 25, p. 777 –778
- DOI: 10.1049/el:19770550
- Type: Article
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p.
777
–778
(2)
The temporal behaviour of the electromagnetic scattering through a periodically short-circuited slot in a metal plate and of the surface current on that plate are compared experimentally. The results show that the changing surface current on the plate is the dominant source of the observed modulation on the scattered energy.
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