Abstract

The multi-mode fibers (MMFs) are attracting the attention for broadband continuum generation due to their capability of high power accommodation. Moreover, graded index (GRIN) MMFs are being preferred over step-index fibers due to the former's equally spaced modal wave numbers and small modal dispersion [1-2]. The Continuum generation is a collaboration of multiple nonlinear effects for example cascaded Raman scattering (CRS) where energy from the pump wavelength is transported to lower or higher wavelengths in the form of anti-stokes and stokes beam, respectively [3]. In this work, we experimentally present the evolution of CRS and intermodal four-wave mixing (IMFWM) in a GRIN-MMF as a function of fiber length while pumping with picosecond (770 ps) laser at 1064 nm in the normal dispersion of the fiber.

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