title: 25-terahertz-bandwidth all-optical temporal differentiator.
abstract: An all-optical temporal differentiator with a record operation bandwidth of ~25 THz (~200 nm, at least one order of magnitude larger than any previously reported temporal differentiation technology) is experimentally demonstrated based on a simple and compact all-fiber wavelength-selective directional coupler. The fabricated directional coupler can be used to process optical signals with time features as short as a few tens of femtosecond. A Gaussian-like optical pulse with a time-width of 250-fs is experimentally differentiated with a processing error of 2.1%. As an application example, a chirp-free flat-top pulse with a time-width of 540-fs is also successfully generated.
authors.affiliation: Institut National de la Recherche Scientifique - Énergie, Matériaux et Télécommunications (INRS-EMT), Varennes, Québec, J3X 1S2 Canada.
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Hoe-Seok
authors.initials: HS
authors.lastname: Jeong
authors.forename: José
authors.initials: J
authors.lastname: Azaña
authors.forename: Tae-Jung
authors.initials: TJ
authors.lastname: Ahn
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*; D055053:Terahertz Radiation