为实现毫米波信号的光学倍频法产生，利用相位调制器和光纤梳状滤波器，构建了光学倍频系统.其中光纤梳状滤波器由起偏器、双折射光纤和检偏器组成.理论分析表明，在该倍频系统中，通过对梳状滤波器双折射延迟量的选择，可有效地抑制非期望的奇次(偶次)谐波成分；通过对调相指数的优化，可进一步提高期望谐波分量的比例.仿真结果说明，利用该系统可有效地产生60 GHz的毫米波信号，并实现2.5 Gbps基带信号的传输.理论分析和仿真验证也表明，基于相位调制的光学倍频系统属于谐波倍频，而非扫频倍频.

To generate millimeter-wave signal using optical method, a optical frequency multiplication (OFM) system was constructed with a phase modulator and a fiber periodic filter. The periodic filter was made of two polarizers and a segment of birefringent fiber. The theoretical analysis shows that in this system the unexpected odd/even harmonic components can be suppressed effectively by adjusting the birefrigent fiber delay. Furthermore, the desired electrical harmonics can be given prominence to the others by optimizing the phase modulation index. The simulation results demonstrate that the 60 GHz millimeter-wave signal can be effectively generated, and 2.5 Gbps NRZ signals can be correctly transmitted in this OFM system. The theoretical and simulation results also indicte that the OFM system based on the sinusoidal-signal phase modulation should be analyzed using the harmonious optical sidebands, instead of the sweeping frequency theory.