[摘要]：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 x 10(-3)c (c is the light speed in free space) and superluminal propagation with a negative group velocity of -1.1 x 10(-3)c has been observed under different modulation phases. (C) 2011 Optical Society of America
