Analogue Optical Fibre Communications (I E E by B. Wilson, Z. Ghassemlooy, I.Z. Darwazeh

By B. Wilson, Z. Ghassemlooy, I.Z. Darwazeh

Covers matters interested in bettering the current variety of platforms and know-how of optical fibre dependent telecommunications prone working with analogue-sourced indications.

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2 Crystal and waveguide lasers Diode-pumped crystal lasers are attractive sources of high power (> 100 mW), narrow linewidth (< 1 kHz), low RIN (< -170 dBc Hz"1) optical signals [8]. They are finding application as sources in wide dynamic range direct detection analogue optical transmission systems for cable TV and related applications. For general application, they suffer from limited tunability (< 60 GHz) and high optical complexity.

This is a current to voltage amplifier and consists of a voltage amplifier with a feedback resistor between the output and the inverting input. It is probably the most common receiver structure in lower speed optical receivers but is difficult to use above 500MHz since phase shifts around the feedback loop increase with frequency and may cause oscillation. Since many SCM systems operate in the GHz regime transimpedance amplifiers are rarely used. The most straightforward approach to a high frequency receiver is to use a photodiode with a bias resistor and a 50Q microwave amplifier.

When co7 = 0 the coherent system is said to be homodyne but when co7 * 0 it is said to be heterodyne. 1) giving an IF carrier-to-noise ratio after photodetection of: (216) where it is assumed that PL0 » PoGl and RIN is the relative intensity noise of the local oscillator laser. 3 Comparison between coherent and direct detection systems Coherent transmission systems offer three main advantages over systems using direct detection. These may be summarised as: (i) Shot-noise-limited reception can be achieved even at low received signal powers, simply by increasing the local oscillator power; (ii) Intensity, frequency or phase modulation modes can be used whereas direct detection systems are limited to intensity modulation; (iii) The excellent frequency selectivity that can be achieved using electrical post-photodetector filters is translated into the optical domain by the coherent detection technique, enabling the realisation of dense wavelength division multiplex schemes for multi-channel transmission or channel selection schemes.

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