An HBT preamplifier for 40-Gb/s optical transmission systems

Abstract

A preamplifier for 40-Gb/s optical transmission systems has been constructed using AlGaAs-InGaAs HBTs with p/sup +/ regrown extrinsic base layers. This preamplifier achieved a bandwidth of 34.6 GHz and a transimpedance gain of 41.6 dB/spl Omega/. This is the widest bandwidth in a preamplifier ever reported. These characteristics are suitable for use in a 40 Gb/s optical receiver. The results indicate that AlGaAs-InGaAs HBTs with p/sup +/ regrown extrinsic base layers are very promising for the implementation of 40 Gb/s optical transmission systems.