The aim of this research is to study of detection sensitivity in optical preamplifier, which is used
as a first stage in optical receivers. This subject is important because it is used in laser
rangefinders. The parameters that affect the distance
measurement using time of flight
technique are studied in details. Then, noise analysis and signal to noise ratio calculation are
performed in preamplifiers to detect a signal with pulse width of 30ns using Matlab. The study
results are applied to some preamplifiers to determine the minimum detectable power.
