Abstract
The present work describes the application of time-transformation (TT) technique to generate supercontinuum (SC) in single mode highly nonlinear chalcogenide as well as silica based normal dispersion fiber (NDF) optic cascaded systems. For this purpose we use phase modulators (PM) in between two such NDFs. The results show that sufficient broadening in the intensity spectrum can be achieved at the end of much shorter lengths of such chalcogenide fibers. It has become possible to obtain more than one third octave of spectral broadening for a 100 fs Gaussian input pulse with energy ~ 354 pJ. Further studies on silica based NDFs after inclusion of PMs in the system show sufficient spectral broadening ~ 130 nm throughout the C and L band of the operating wavelength zone such that it can be potentially used in broadband communication system. The application of such PMs as well as TT technique for the purpose of SC generation by normal dispersion fiber optic cascaded system has not been reported till now. It should also be stated that input energy requirement is sufficiently low in our case when compared to similar works reported earlier.
Published Version
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