Open AccessTunable dispersion-tolerant picosecond flat-top waveform generation using an optical differentiator
Author(s) -
Radan Slavı́k,
Y. Park,
José Azaña
Publication year - 2007
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.15.006717
Subject(s) - optics , dispersion (optics) , picosecond , materials science , waveform , differentiator , pulse (music) , distortion (music) , optical fiber , dispersion shifted fiber , coupling (piping) , fiber , optoelectronics , fiber optic sensor , bandwidth (computing) , physics , telecommunications , laser , computer science , detector , metallurgy , composite material , radar , amplifier , cmos
We study the influence of dispersive propagation on picosecond flat-top pulses, which are generated using long period fiber grating (LPG)-based optical differentiators. We suggest an extremely simple scheme to compensate for the dispersion-induced flat-top pulse distortion; this scheme is based on proper tuning the LPG coupling strength. As this coupling strength may be changed via LPG axial straining, the demonstrated device can be tuned to compensate for different levels of the dispersion in a very easy and straightforward fashion. This allows for very fine flat-top pulse shape adjustment, even after propagation through a relatively long section of dispersive optical fiber. In the experimental demonstration reported here, the dispersion tolerance of 1.8-ps flat-top pulses propagating through a standard telecom fiber (SMF-28) was increased from approximately 2 m to approximately 18 m, giving a 9-fold improvement.