Abstract

We propose and experimentally demonstrate the propagation of slow/fast light in an erbium-doped fiber (EDF) using mutually modulated cross-gain modulation. The group velocity of the light signal can be manipulated by the effect of gain cross-saturation modulation by a saturating light at an arbitrary wavelength in the gain bandwidth of the EDF. The ultraslow propagation with a small group velocity of $5.6\times {10}^{-3}c$ (c is the light speed in free space) and superluminal propagation with a negative group velocity of $-1.1\times {10}^{-3}c$ has been observed under different modulation phases.

© 2011 Optical Society of America

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