InP DHBT Very High Speed Power-DACs for Spectrally Efficient Optical Transmission Systems

摘要

This paper reports on very high speed large swing digital-to-analog converter (DAC) suiting the generation of spectrally efficient optical transmission signals. 2-bit and 3-bit DACS with up to 4 Vpp swing, operating up to 50 GBaud, have been fabricated using our InP DHBT technology (FT ~280 GHz, FMAX ~270 GHz, BVCE0 ~5 V). These chips have been packaged and used to generate 16- and 64-QAM signals in optical transmission experiments at various bitrates.