Optical communication systems that use wide-band optical semiconductor amplifiers and high-speed signal processing

Abstract

This work clarifies the analysis of the theoret- ical study of noise and transmission gain characteristics of
semiconductor optical amplifiers (SOAs), which are relevant in the novel local area optical communication systems. We
investigated the effects of noise on AlGaAs/ GaAs SOA transmission performance through the mea- surement of output
power, optical gain, the optical signal- to-noise ratio, and noise figure. It was observed that noise has a dramatic effect on
SOAs’ operation transmission efficiency, and the performance of the amplifier structure may be limited. If the drive
current and injection power at the SOA can be changed and its active region length modified, then the variation of gain,
optical signal-to- noise ratio, and noise figure at the output of the structure can be obtained.