基于马赫-曾德尔调制器的多种调制格式微波信号的光学生成研究

提出了一种基于马赫-曾德尔调制器(MZM)的 多种调制格式微波信号的光学一体化生成方案。 在本文方案中,微波信号和编码矩形波信号经合路器同时输入到MZM中,通过合理设置编码 信号的幅值使 MZM能够工作在其传输曲线的不同传输点,分别实现了频移键控(FSK)、二进制相移键控(BPSK)和 二倍频BPSK微波信号一体化生成。本文方案仅需要1个MZM而不需要额外加电的或光的选频器 件, 因此具有结构简单、可大范围调谐的优势。特别的,本文方案还可以产生二倍频的BPSK微波 信号,从 而使能够满足更高频的应用需求。在仿真和实验中,分别得到10/20 GHz的FSK、10GHz的BPSK 微波信号,同时产生了20GHz的二倍频BPSK微波信号,有效验证了本 文方案的可行性。

Optical generation of microwave signals with multiple modulation formats based on Mach-Zehnder modulators

A optical approach to generate microwave signals with multiple modula tion formats using a Mach-Zehnder modulator (MZM) is proposed and demonstrated.In the prop osed approach,a microwave signal and an encoded rectangular wave signal are simultan eously sent to an MZM via a coupler.By properly setting the amplitude of the encoded signals, the MZM can operate at different transmission points in its transmission curve,which leads to the generation of microwave signals with multiple modulation formats,such as frequency-shift key ing (FSK),binary phase-shift keying (BPSK) and frequency-doubling BPSK.Only a single MZM is required in the proposed scheme,and no frequency-dependent electrical devices o r wavelength-dependent optical devices are applied.Therefore,the scheme has compa ct structure and large frequency tunability.Specifically,frequency-doubling BPS K microwave signal can be generated in this structure as well,which will make our scheme to meet the demand of higher frequency applications.In the experiments and simulations,the FSK micro wave signal at 10/20GHz,BPSK microwave signal at 10GHz and frequency-doubling BPSK microwave signal at 20GHz are respectively generated,which verifies the feasibility of the propose d approach.