Signal transmission line for an optical modulator

摘要

An electro-absorptive-modulated laser (EAML) module includes a signal transmission line for transferring a high-frequency modulating signal from a signal source having an output impedance of 50 Omega to an EA modulator in the EAML module. The signal transmission line includes a coplanar waveguide with ground plane (CPWG) having a characteristic impedance of 41.8 Omega, a series resistor having a resistance of 5 Omega, and a termination resistor of 50 to 150 Omega. The characteristic impedance of CPWG is controlled by reducing the gap between the signal line and coplanar ground plates.