Abstract
Recently developed optical fibres show particularly favourable loss and dispersion characteristics at transmission wavelengths near 1.3 microns. The new generation of terminal equipment needed for long wavelength optical systems includes semiconductor GaInAsP lasers, LEDs and photodetectors. Work at Plessey is aimed towards development of transmitter and receiver units for use in 34 and 140 Mbit/s fibre-optic systems. Our receiver design is based on a hybrid assembly of a PIN photodiode and a high impedance FET preamplifier. This approach provides the best receiver sensitivity whilst offering potentially greater reliability than alternative receiver concepts. Using existing high speed LED transmitter units and PIN-FET receivers, link lengths of up to 40 km can be achieved for 140 Mbit/s systems.
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