Recently a cross-phase modulation scheme that yields giant Kerr nonlinearities by use of an electromagnetically induced transparency (EIT) was proposed [Schmidt and Imamoğlu, Opt. Lett. 21, 1936 (1996)]. We analyze the high-speed properties of this scheme for short-pulse propagation. We discuss the relevant losses in this system and show that for short pulses one-photon losses are dominant. We demonstrate that over the entire bandwidth the attainable phase shift in an EIT scheme with a quasi-cw coupling field is orders of magnitude higher than in a conventional three-level scheme or in EIT schemes, in which matched pulses are used to create the transparency.
© 1998 Optical Society of America
(020.1670) Atomic and molecular physics : Coherent optical effects
(060.5060) Fiber optics and optical communications : Phase modulation
(190.3270) Nonlinear optics : Kerr effect
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
H. Schmidt and A. Imamoğlu, "High-speed properties of a phase-modulation scheme based on electromagnetically induced transparency," Opt. Lett. 23, 1007-1009 (1998)