基于并联MZM的半波余弦信号光产生方法

Method for generating half-wave cosine signal light based on parallel MZM

针对微波信号的产生问题,基于有限项傅里叶级数可以逼近半波余弦信号的原理,提出了基于并联马赫-曾德尔调制器(MZM)的半波余弦信号光产生方法.首先激光器发射的连续波光信号经光耦合器被分成三路,分别经过双边带(DSB)调制、单边带(SSB)调制和光载波抑制(OCS)调制的马赫-曾德尔调制器(MZM);然后经光电探测器(PD)拍频分别得到直流、基频和二次谐波信号;最后经电移相器、衰减器和电耦合器即可输出半波余弦信号.仿真结果表明该方法可以生成半波余弦信号,验证了所提方法的可行性和有效性.

Aimed at microwave signal generation and based on the principle that the finite-order Fourier series can approximate the half-cosine signal,this paper proposes a half-wave cosine signal generation method based on parallel Mach-Zehnder modulator(MZM).The continuous wave optical signal emitted by a laser is divided into three channels by optical coupler,respectively through double sideband(DSB)modulation,single sideband(SSB)modulation and optical carrier suppression(OCS)modulated MZM.And then,these three channels beat frequency by photo-detector(PD),resulting in DC signal,fundamental signal and second harmonic signal respectively.Finally,half-wave cosine signal can be output by electric phase shifter,attenuator and electric coupler.The simulation results show that the proposed method can generate half-wave cosine signal,which proves its feasibility and validity.