一种新的微波/毫米波产生方法

Novel Approach for Microwave/Millimeter Wave Generation

提出一种新的微波/毫米波光产生方法,将激光脉冲入射到单模光纤FP腔中,激发腔中的两个本征模,利用两本征模相位失谐与光外差方法得到微波/毫米波信号,得出单模光纤FP腔结构参数与微波/毫米波信号频率间的关系表达式。数值计算表明:调制频率为25 MHz的脉冲激光入射到单模光纤FP腔时,可得到频率为2.083 GHz的微波信号。通过调节FP腔内的双折射强度,可得到从微波到毫米波的信号。该方案只需一个激光光源,成本低、可靠性高、稳定性好。

A novel microwave and millimeter wave generation approach is proposed and theoretically demonstrated. A pulsed laser is injected into a single-mode fiber FP cavity, two eigenmodes are excited, and microwave/millimeter wave signal can be obtained using the phase mismatch of two eigenmodes and optical heterodyne method, a general relationship between output signal frequency of microwave/millimeter wave and structure parameter of single-mode fiber FP cavity is derived. Nu- merical results demonstrate that microwave signal with 2. 083 GHz frequency is generated when a pulsed laser with 25 MHz modulated frequency is injected into single mode fiber FP cavity, the signal from microwave to millimeter wave by adjusting the birefringence degree of single-mode fiber FP cavity. This approach needs only one laser light source and has the advantages of low cost, high reliability and good stability.