All-optical limiting using nonlinear directional couplers composed of a self-focusing and a self-defocusing waveguide

W. Wang, Y. Wang, K. Allaart, D. Lenstra

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

3 Citaties (Scopus)

Uittreksel

We numerically demonstrate the all-optical limiting features in a mismatched nonlinear directional coupler (NLDC) composed of a self-focusing and a self-defocusing waveguide for both continuous wave and pulse cases. The working conditions required are analyzed. To obtain the limiting feature, the propagation constant of the self-focusing waveguide should not be larger than that of the self-defocusing waveguide. Cascaded asymmetric NLDCs are investigated to improve the limiting characteristics. The limiting threshold and the limiting output power can be adjusted by varying the coupler length or the ratio of the nonlinearity coefficients of the self-defocusing and self-focusing waveguides. Analytical solutions are presented in the case of a continuous wave. For the pulse case, numerical solutions show that the top part of the output pulse, if it exceeds the limiting threshold, will be tailored, while the rising and falling edges of the output pulse are almost the same as the input pulse. There is almost no pulse breakup. The influence of the second order dispersion and the intermodal dispersion on the limiting characteristics are analyzed.

Originele taal-2Engels
Pagina's (van-tot)623-628
Aantal pagina's6
TijdschriftApplied Physics B: Lasers and Optics
Volume83
Nummer van het tijdschrift4
DOI's
StatusGepubliceerd - 1 jun 2006

Vingerafdruk

directional couplers
defocusing
self focusing
waveguides
pulses
continuous radiation
output
thresholds
falling
couplers
nonlinearity
propagation
coefficients

Citeer dit

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All-optical limiting using nonlinear directional couplers composed of a self-focusing and a self-defocusing waveguide. / Wang, W.; Wang, Y.; Allaart, K.; Lenstra, D.

In: Applied Physics B: Lasers and Optics, Vol. 83, Nr. 4, 01.06.2006, blz. 623-628.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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