In this letter, we propose and demonstrate a simple and novel method for fiber chromatic dispersion (CD) measurement based on microwave photonic technique. The radio frequency (RF) signal is modulated simultaneously on two light-waves with different wavelengths, and the light-wave carrying RF signals transmit through the dispersive medium under test. CD can be obtained by monitoring the power changing of the interference RF signals after photo detector. The CD values of the single-mode and dispersion compensation fibers are both measured within the wavelength range from 1 525 to 1 605 nm, which verifies the feasibility of this method.

A photonic approach for measuring microwave frequency over a wide bandwidth is proposed. An optic group delay line composed of several magneto-optical switches and a 1.6-km single-mode fiber is used as a tunable dispersive medium in the measurement setup. A minimum frequency accuracy of 80 MHz in the range of 1–20 GHz is achieved experimentally.

对应用于光控相控阵系统的级联微环集成波导光延时线进行了研究，重点分析了波导微环耦合系数在过耦合和欠耦合状态下对其延时响应的影响。以三环级联光延时线结构为例，研究了无限制耦合条件和过耦合条件下得到的优化结构参数以及获得的延时性能。结果表明，在小的延时量目标下，无限制耦合条件比过耦合条件更有利于实现带内平坦的延时响应和幅度响应，对集成波导微环光延时线的设计与实现具有良好的参考价值。