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Opt Express. 2011 Jun 6;19(12):11584-90. doi: 10.1364/OE.19.011584.

On-chip two-octave supercontinuum generation by enhancing self-steepening of optical pulses.

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1
Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA. linzhang@usc.edu

Abstract

Dramatic advances in supercontinuum generation have been made recently using photonic crystal fibers, but it is quite challenging to obtain an octave-spanning supercontinuum on a chip, partially because of strong dispersion in high-index-contrast nonlinear integrated waveguides. We show by simulation that extremely flat and low dispersion can be achieved in silicon nitride slot waveguides over a wavelength band of 500 nm. Different from most of previously reported supercontinua that were generated either by higher-order soliton fission in anomalous dispersion regime or by self-phase modulation in normal dispersion regime, a two-octave supercontinuum from 630 to 2650 nm (360 THz in total) can be generated by enhancing self-steepening in pulse propagation in nearly zero dispersion regime, when an optical shock as short as 3 fs is formed.

PMID:
21716390
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