A tunable multi-passband microwave photonic filter

In this article, we have proposed and demonstrated two new approaches to implement microwave photonic filter with tunable multi-passband based on reflective fiber Mach-Zehnder interferometer and cascaded fiber Mach-Zehnder interferometers and dispersive medium. The proposed MPF has simple structure and is easy to implement, also the experimental results show good tunability and switch performances.