Tucker’s small signal model for semiconducter laser diode has been improved so as to be used for the DC and AC analysis of the OEIC with SPICE program. Using this improved model

the monolithic integration of a heterojunction bipolar transister driving circuit and a laser diode has been analysed. It has been shown that the base resistance Rb and the forward transit time tf are the most important parameters of HBTs which affect the frequency characteristics of the OEIC seriously. The frequency response of the OEIC will be reduced by 66% and 63%

if Rb is increased from 1Ωto 5Ω and tf from 0.5 ns to 1 ns respectively. Through the analysis

the optimized parameters which are suitable for the existing techniques have been extracted

and then

the frequency characteristics of it with the optimized parameters has been obtained

which indicates that the frequency response of the optimized OEIC is close to that of the single LD proper.