Off-chip matching circuit for electroabsorption optical modulator

An optical module comprising

• an optical device having as inputs both an optical signal and an electrical signal, for providing as an output a modified optical signal, said optical device exhibiting a predetermined impedance;
• and
• a broadband circuit coupled at a first end as the electrical signal input to said optical device, said broadband circuit for providing impedance matching between an external electrical signal source, coupled at a second, opposite end to said broadband impedance matching circuit, and the optical device, said electrical signal source and said optical device being physically separated with said optical device disposed on a first submount, said broadband circuit comprising
• a second submount for supporting a transmission line conductor between the electrical signal source and said optical device, said second submount further supporting a shunt resistance element for supplying high frequency impedance matching between said electrical signal source and said optical device;
• and
• a series inductance element coupled between said shunt resistance and said optical device for providing an electrical connection and low frequency impedance matching between said electrical signal source and said optical device.