Open Access25-terahertz-bandwidth all-optical temporal differentiator
Author(s) -
Ming Li,
Hoe-Seok Jeong,
José Azaña,
Tae-Jung Ahn
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.028273
Subject(s) - differentiator , optics , bandwidth (computing) , femtosecond , terahertz radiation , chirp , pulse shaping , materials science , wavelength , optical fiber , optoelectronics , physics , laser , computer science , telecommunications
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.