基于无源光纤环形腔双折射的光生毫米波技术

Photonic Generation of Millimeter-wave Based on Birefringence of Passive Fiber Ring Cavity

研究了一种基于无源光纤环形腔双折射效应的光生毫米波方法。入射光脉冲激发光纤环形腔中的2个相互正交的本征模,在双折射的作用下两者相位在传输过程中会发生相对变化,在输出端利用偏振片将2本征模式合成,利用外差技术得到毫米波信号。讨论了单模光纤双折射参数、环形腔的损耗、耦合系数对所产生毫米波信号频率、强度的影响。研究表明,该方案结构简单,所得结论具有一定的理论意义。

A novel photonic generation of millimeter waves based on the birefringence in a single-mode fiber ring cavity is proposed and researched theoretically.The input pulsed laser stimulates two orthogonal eigen-modes in a single-mode fiber ring cavity,the birefringence of single-mode fiber causes a phase mismatch for the two eigen-modes,this phase mismatch leads the generation of millimeter waves,out of the ring cavity a pigtail polarizer is used to intergate the two eigen-modes,and then the millimeter wave signal is obtained by using heterodyne method.Effects of single-mode fiber birefringence parameter,loss of ring cavity and coupling coefficient on the frequency and intensity of generated millimeter wave signal are discussed.The proposed approach is simple,it provides a theoretical guidance.