An over 67-GHz Bandwidth 21-dB Gain 4.5-Vppd Linear Modulator Driver for 100-GBaud Coherent Optical Transmitter

A linear driver for 100-GBd optical transmitters was designed and fabricated in the 90-nm SiGe BiCMOS process. An output-swing-limiting circuit and multitopology peaking method are proposed to extend the bandwidth. The fabricated driver achieved a differential gain of 21 dB with a bandwidth of over 67 GHz and a per-side output 1-dB compression point (Po1dB) of over 11 dBm, corresponding to a diffe...