1. All silica S-band double-pass erbium-doped fiber amplifier
2. M. M. Kozak, R. Caspary, and W. Kowalsky , “Thulium-doped fiber amplifier for the S-band,” inProc. the Int. Conf. on Transparent Optical Networks, ICTON’2004, pp. 51–54 (2004).
3. Gain-clamped S-band discrete Raman amplifier
4. R. Caspary, U. B. Unrau, and W. Kowalsky , “Recent progress on S-band fiber amplifiers,” inProc. Int. Conf. on Transparent Optical Networks, ICTON’2003, pp. 236–242 (2003).
5. Y. Chen, R. Pavlik, C. Visone, F. Pan, E. Gonzales, A. Turukhin, L. Lunardi, D. AL-Salamch, and S. Lumish , “40 nm broadband SOA-Raman hybrid amplifier,” inProc. OFC2002(2002).