45 GHz distributed amplifier with a linear 6-Vp-p output for a 40 Gb/s LiNbO/sub 3/ modulator driver circuit

Abstract

We developed a coplanar waveguided-type distributed amplifier for a LiNbO/sub 3/ modulator driver (LN driver) using double-doped AlGaAs/InGaAs/AlGaAs-pseudomorphic High Electron Mobility Transistors (p-HEMTs). By using a stabilization and impedance control technique, we obtained a 45 GHz bandwidth for coplanar waveguided (CPW) lines with a 600 /spl mu/m thick substrate and 54 GHz bandwidth for grounded coplanar waveguided (GCPW) lines with a 75 /spl mu/m thick substrate, and a linear 6-Vp-p output at 40 Gb/s. These results indicate that our circuit design technique is suitable for use in fiber-optic communication systems.