Slow-light techniques hold great promise for application in many areas of modern photonics, including telecommunications. Good progress is being made in the development of new techniques for producing controllable time delays in optical waveguides based on slow-light methods. The proposed applications of slow light are for the progress of optical buffering. Numerical modeling shows that the performance of a switching network under high traffic conditions can be dramatically increased through the use of such buffering. The key parameter of interest for a slow-light delay line is normalized time delay. A key issue in all slow-light experiments is finding the maximum modulation bandwidth that can experience the full slow-light effect.