2005/12/01 by Aaron Schweinsberg, N.N. Lepeshkin, Matthew S. Bigelow +2 · 2 citations
Physics and Astronomy · #Quantum optics and atomic interactions #Advanced Fiber Laser Technologies #Atomic and Subatomic Physics Research
paper · pdf · doi:10.1209/epl/i2005-10371-0
openalex publication_date 2005/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We observe both extremely slow and superluminal pulse propagation speeds at room temperature in an erbium-doped fiber (EDF). A signal at 1550 nm is sent through an erbium-doped fiber with varying powers of a 980 nm pump. The degree of signal delay or advancement is found to depend significantly on the pump intensity. We observe a maximum fractional advancement of 0.124 and a maximum fractional delay of 0.089. The effect is demonstrated both for a sinusoidally modulated signal and for Gaussian pulses. The ability to control the sign and magnitude of the pulse velocity could have important implications for applications in photonics.