A method was developed to double the voltage at the input of an electro-absorption modulator (EAM) by directly mounting the EAM on the driver, without using a matching resistor. The driver circuit was a travelling wave HBT amplifier with a measured 3 dB bandwidth of greater than 40 GHz and a gain of 12 dB. A simulated EAM optical output was shown for a 2.50 Volt 40 Gb/s drive voltage. To my knowledge this is the first such driver/EAM circuit to use the voltage doubling method
['Alois P. Freundorfer']
Integrated Electro-Absorption Modulator and GaAs HBT Driver Circuit