We propose a novel 16-quadrature amplitude modulation (QAM) transmitter based on two cascaded IQ modulators driven by four separate binary electrical signals. The proposed 16-QAM transmitter features scalable configuration and stable performance with simple bias-control. Generation of 16-QAM signals at 40 Gbaud is experimentally demonstrated for the first time and visualized with a high speed constellation analyzer. The proposed modulator is also compared to two other schemes. We investigate the modulator bandwidth requirements and tolerance to accumulated chromatic dispersion through numerical simulations, and the minimum theoretical insertion attenuation is calculated analytically.
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ErrataStefan Wolf, Matthias Lauermann, Philipp Schindler, Gregor Ronniger, Kristina Geistert, Robert Palmer, Sebastian Köber, Wim Bogaerts, Juerg Leuthold, Wolfgang Freude, and Christian Koos, "DAC-Less Amplifier-Less Generation and Transmission of QAM Signals Using Sub-Volt Silicon-Organic Hybrid Modulators," J. Lightwave Technol. 33, 1425-1432 (2015)