Cao Pan, Hu Xiaofeng, Zhang Liang, Wu Jiayang, Jiang Xinhong, Su Yikai
Opt Express. 2014 Jun 16;22(12):14433-40. doi: 10.1364/OE.22.014433.
We propose and experimentally demonstrate a new scheme for photonic generation of microwave frequency shift keying (FSK) signal by employing one single-drive Mach-Zehnder modulator (MZM). In the proposed method, an electrical signal with different radio frequency (RF) amplitudes and direct current (DC) components for bit '0' and bit '1' is generated. After amplification, the signal is fed into a single-drive MZM which is biased at the quadrature and null points of its transmission curve for bit '0' and bit '1', respectively. Due to the different RF amplitudes, a microwave FSK signal can be obtained after photodetection, where the space frequency is the same as the RF frequency and the mark frequency is twice as large as the RF frequency. The feasibility of the proposed scheme is verified by a proof-of-concept experiment. 5/10-GHz and 10/20-GHz microwave FSK signals with different bit rates are successfully demonstrated.
我们提出并通过实验证明了一种利用单个驱动马赫-曾德尔调制器（MZM）进行光子产生微波频移键控（FSK）信号的新方案。在所提出的方法中，生成了用于表示比特“0”和比特“1”的具有不同射频（RF）幅度和直流（DC）分量的电信号。放大后，该信号被馈入一个单个驱动的MZM，该MZM分别在其传输曲线的正交点和零点处偏置以表示比特“0”和比特“1”。由于不同的RF幅度，在光检测之后可以获得微波FSK信号，其中空频与RF频率相同，传号频率是RF频率的两倍。通过概念验证实验验证了所提出方案的可行性。成功演示了具有不同比特率的5/10-GHz和10/20-GHz微波FSK信号。
