Abstract
Cascaded Raman wavelength shifting up to the fourth order ranging from 2092 to is demonstrated using a nanosecond pump at in a low-loss suspended-core microstructured fiber. These four Stokes shifts are obtained with a low peak power of , and only are required to obtain three shifts. The Raman gain coefficient for the fiber is estimated to at . The positions and the amplitudes of the Raman peaks are well reproduced by the numerical simulations of the nonlinear propagation.
© 2011 Optical Society of America
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