FIBER AMPLIFIERS: High-power-amplifier technology extends long-haul networks and fi ber-to-the-premises
The usefulness of advances in high-power multimode pumplaser-diode technology depends upon corresponding advances in erbium-doped active fi ber and multimode pumpcoupling optics. KAMEEL WAKIM, DAN VALCOUR, AND PETER REEVES-HALL OF IPG PHOTONICS (OXFORD, MA)