Ultra-Broadband Electrical Signal Generation and IM/DD Transmission of QAM Signals at Symbol Rates Up to 90 GBd

We study ultra-broadband electrical signal generation based on balanced heterodyne reception of I/Q-modulated optical signals. We successfully generate signals with up to 100 GHz electrical bandwidth and show the viability of our concept by IM/DD transmission of QAM signals at up to 90 GBd modulated onto an electrical subcarrier.