THz-bandwidth photonic Hilbert transformers based on fiber Bragg gratings in transmission

作者: María R. Fernández-Ruiz , Lixian Wang , Alejandro Carballar , Maurizio Burla , José Azaña

DOI: 10.1364/OL.40.000041

关键词: TransformerImpulse responseTerahertz radiationPhotonicsFiber Bragg gratingPhase responseImage processingOpticsPHOSFOSMaterials science

摘要: THz-bandwidth photonic Hilbert transformers (PHTs) are implemented for the first time, to best of our knowledge, based on fiber Bragg grating (FBG) technology. To increase practical bandwidth limitation FBGs (typically <200  GHz), a superstructure two superimposed linearly-chirped operating in transmission has been employed. The use FBG involves conversion non-minimum phase response PHT into minimum-phase by adding an anticipated instantaneous component desired system temporal impulse response. Using this methodology, 3-THz-bandwidth integer and fractional (order 0.81) designed, fabricated, successfully characterized.

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