Realization and modulation of Fano-like lineshape in fiber Bragg gratings

Optical fiber Bragg gratings (FBGs) featured with narrowband transmission dips (or reflection peaks) have been maturely employed in technologies of optical communications, lasers and sensors. Here, we report a simple strategy to control the lineshapes of FBG's transmission dip by inserting the FBG in one arm of an all-fiber Mach-Zehnder interferometer (MZI). The transmission dip could be modulated...