The Fundamentals of Signal Transmission: Optical Fibre, by Lemuel Ibbotson

By Lemuel Ibbotson

'The basics of sign Transmission' offers a dialogue of the most kinds of sign transmission media. Twisted pair, coaxial line, optical fibre, waveguides and freespace propagation and antennas are lined utilizing a typical layout. After a dialogue of signs usually, the character of wave propagation is tested. those basics are then relating to the explicit transmission varieties. arithmetic is stored so simple as attainable and is complemented through abundant qualitative clarification; the place invaluable extra precise arithmetic are available within the appendices. a few wisdom of easy digital circuit thought and box conception is believed. Written in an off-the-cuff and obtainable type, 'The basics of sign Transmission' presents all undergraduate electronics engineers with a concise review of electromagnetic sign transmission. written in an iformal and obtainable sort presents a concise assessment of electromagnetic sign transmission covers all of the major kinds of sign transmission in a single quantity

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Extra info for The Fundamentals of Signal Transmission: Optical Fibre, Waveguides and Free Space

Example text

However, in free space, at a distance that is large compared to the initial beam diameter, the wavefront becomes effectively spherical again (an area on the surface 40 Electromagnetic waves of a sphere, not the whole sphere), due to the phenomenon of diffraction. In consequence, the power density of free-space radiation always falls off ultimately as the square of the distance from the driving point. 4 shows a cross-section of the fields associated with a wave on an ideal twin-wire transmission line - notice that here also the electric and magnetic fields are everywhere at right angles, and they are in phase.

This ease is illustrated in Fig. 11. Is there any way of dealing with the end of a transmission line so that no reflection occurs? If a resistance equal to the characteristic impedance of the line (remember, this is a line without dispersion, so its characteristic impedance will be resistive) is connected to the end then its ratio of current to voltage is exactly fight to absorb the energy from the pulse as it arrives. Looking at it another way, a further infinite length of line, connected to the end of the actual line, would have an input impedance R0; the pulse, when it reaches the termination, could as well be entering a further section of line.

Equalization The variation of attenuation with frequency and the dispersion of a transmission line can be compensated for to some extent by connecting to the end of the line before the load an equalizer circuit. This is a type of filter circuit which is tailored to have an amplitude/frequency characteristic and a phase-shift/frequency characteristic which are complementary, as far as possible, to those of the line. Effects of reflections We have seen that if the load is not matched to the line some of the power is reflected back - and hence wasted.

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