Phys. Rev. Lett. 93, 163902 (2004) [4 pages]Modulational Instability and Parametric Amplification Induced by Loss Dispersion in Optical FibersReceived 14 April 2004; published 13 October 2004 We show that modulational instability may arise even in the normal group-velocity dispersion regime of an optical fiber when the fiber loss (gain) varies depending on the wavelength. A simple analytical expression for the instability gain is obtained, which reveals that the odd-order terms of the loss dispersion are responsible for this phenomenon. The instability gain is measured experimentally in an optical-parametric-amplification configuration. Large parametric gain is induced in a non-phase-matched regime as we apply narrow band loss at the idler wavelength. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.163902
DOI:
10.1103/PhysRevLett.93.163902
PACS:
42.65.Sf, 42.65.Hw, 42.65.Yj, 42.81.Dp
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