TY - JOUR AU - Horiguchi, Masaharu AB - State of the art optical amplifier technologies are reviewed focusing on research at ntt. The following developments will be described : an erbium-doped silica fiber with a very high gain coefficient of 11.0 dB/mW, a very small (volume : 36 cc) fiber amplifier module pumped by a 980 nm InGaAs laser diode, an Er-doped fiber amplifier pumped by an AlGalnP visible laser diode, praseodymium-doped fluoride glass fiber amplifiers operating in 1300 nm band, silica-based erbiumdoped planar lightwave circuit amplifiers, and their applications in various optical transmission and measurement systems. The future trends in the optical amplifier research are also described. TI - Recent progress in optical amplifiers JF - Annals of Telecommunications DO - 10.1007/BF02995461 DA - 2008-11-20 UR - https://www.deepdyve.com/lp/springer-journals/recent-progress-in-optical-amplifiers-0REC0vFC0h SP - 356 EP - 367 VL - 48 IS - 8 DP - DeepDyve ER -