Abstract
We report superluminal propagation in optical fibers using Brillouin lasing oscillation in a ring cavity. Negative group velocity propagation through a 10-m single mode fiber has been experimentally demonstrated. An advancement of 221.2 ns was observed before the input signal, which was achieved with a very high slope efficiency of . This indicates that this way is suitable for long-distance low-loss superluminal propagation via optical fibers. Correspondingly, the group velocity is and the group index is —the highest group velocity ever reported for optical fibers.
- Received 19 March 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.093903
© 2011 American Physical Society