An over 70-GHz 4.9-Vppdiff swing InP linear Driver for next generation coherent optical communications

This paper presents an over 70-GHz 4.9-Vppdiff (peak-to-peak differential) linear electro-optical (E/O) modulator Driver fabricated in III-V Lab s 0.7-mum InP DHBT technology. On-wafer measurements exhibit a differential gain of 15.1 dB at 0.2 GHz and a 4.1-dB peaking gain at 51-GHz. Record bandwidth and maximum peaking-frequency, for a lumped linear Driver, are obtained. Very high quality 100-Gb/s NRZ and 50-GBd PAM-4 output eye diagrams have been obtained. A good measurement and EM- simulation agreement is shown. The InP linear Driver power consumption is respectively 0.94 and 1.2 W at 4.1 and 4.9-Vppdiff output swings.