Abstract
This paper investigates the nonlinear generation of ultra-flat broadband
spectra suited to communication applications. The technique is based on the
inclusion of a linear pulse shaping element prior to a nonlinear fiber, where
highly controllable spectral broadening is enabled. An adaptive pulse shaping
system exploiting optimization algorithms (evolution strategy—ES) allows
for automatic convergence to the desired spectrum. Using this technique, a
spectrum exhibiting a 3-dB bandwidth of ~12 nm and a 0.5-dB bandwidth of ~8 nm is reported.
The technique can be used to generate even broader spectra or indeed spectra
exhibiting more exotic shapes.
© 2012 IEEE
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