We use the well-known duality between paraxial diffraction in space and dispersion in time to propose a time-domain analog to spatial Fraunhofer diffraction. This analog permits the design of real-time optical Fourier-transformer systems. These systems are shown to be realizable by use of linearly chirped fiber gratings as dispersive media.
© 1999 Optical Society of America
Miguel A. Muriel, José Azaña, and Alejandro Carballar, "Real-time Fourier transformer based on fiber gratings," Opt. Lett. 24, 1-3 (1999)