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All-optical frequency down-conversion based on cross-phase modulation in high nonlinearity dispersion-shifted fiber for WDM radio over fiber application

Yang H., Sun J., Du Q.

Optica Applicata

2009

Vol. 39, nr 1

51--62

Simultaneous all-optical frequency down-conversion technique based on cross-phase modulation in a high nonlinearity dispersion-shifted fiber is proposed and verified by simulation, and its application to a wavelength-division-multiplexing (WDM) radio over fiber (ROF) is proposed. Error-free simultaneous all-optical frequency down-conversion of the 16 WDM ROF upstream channels is achieved. The simulated results show the performance of WDM signals is in good accordance with a single signal without any interference, and the power difference of two beat frequencies of the down-conversion signal is independent of the optical local oscillator power. The wavelength span of larger than 20 nm for down-conversion signal can be obtained.

Wide beam stabilities and instabilities in one dimensional arrays of Kerr-nonlinear channel waveguides

Meier J., Christodoulides D. N., Stegeman G. I., Yang H., Salamo G., Morandotti R., Aitchison J. S., Silberberg Y.

Opto-Electronics Review

2005

Vol. 13, No. 2

75-84

The propagation of wide (plane-wave like) and narrow high intensity beams at 1550 nm was investigated in 1D arrays of AlGaAs channel waveguides which are nearest-neighbour coupled via evanescent fields. Spatial diffraction (beam spreading) by evanescent field coupling leads to dispersion relations that are periodic with propagation direction and hence exhibit regions of both normal and anomalous diffraction. This results in propagation directions in which filamentation of high intensity beams with superimposed noise occurs, and other regions in which these beams are stable against noise. Both cases were observed experimentally, and the modulation instability gain was measured versus the spatial frequency of the noise. Good agreement with theory was found.