仿光通信中半导体光放大器SOA的交叉增益调制，同时给出了NRZ信号的频谱图及时域图-simulate XGM in SOA and the graph of NRZ signal

A NRZ DAC is the most common DAC employed in CT Formula. In this paper only a single bit DAC is employed generating the feedback voltages Formula, where Formula is the reference voltage.