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This thesis investigates the design of an optical preamplifier suitable for operation at 565 Mbit/s and at a wavelength of 1550 nm. Several design issues are examined ,namely the use of either an APD or a PIN, a high impedance or transimpedance configuration, a fet or bipolar front end, a cascode or shunt feedback second stage. Different amplifier configurations are studied and their performance compared. The transimpedance amplifier is chosen for it wide dynamic range and good sensitivity. Thedoi:10.26190/unsworks/5052 fatcat:t7q5blqjwjaubphntdferdvkiq