Title :
42 GBd 3-bit power-DAC for optical communications with advanced modulation formats in InP DHBT
Author :
Konczykowska, Agnieszka ; Dupuy, Jean-Yves ; Jorge, Filipe ; Riet, M. ; Moulu, J. ; Nodjiadjim, V. ; Berdaguer, P. ; Godin, J.
Author_Institution :
III-V Lab., CEA, Marcoussis, France
Abstract :
A 3-bit power-DAC was designed and fabricated in 0.7 μm InP double-heterojunction bipolar transistor (DHBT) technology. An 8-level differential output signal with 3.6 Vpp amplitude was measured at symbol rates in the range of 40 GBd. The circuit combines DAC and driver functions allowing to directly drive a modulator without need for a linear amplifier. This compact IC solution is suitable for transmitters with advanced modulation formats like 64-QAM operating at high symbol rate.
Keywords :
digital-analogue conversion; driver circuits; heterojunction bipolar transistors; indium compounds; optical communication; optical modulation; 64-QAM; DHBT technology; InP; advanced modulation formats; compact IC solution; double-heterojunction bipolar transistor; driver functions; optical communications; power-DAC; size 0.7 mum; voltage 3.6 V; word length 3 bit;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2011.0154
