Title :
Pump wavelength independent gain with bidirectionally pumped alumino-silicate erbium-doped fiber amplifiers in the 800 nm pump band
Author :
Bastien, Steven P. ; Sunak, Harish R D
Author_Institution :
Dept. of Electr. Eng., Rhode Island Univ., Kingston, RI, USA
Abstract :
Using a comprehensive computer model, it was shown that the effects of excited state absorption (ESA), in the 800 nm pump band, in alumino-phosphate-silicate (APS) erbium-doped fiber amplifiers (EDFAs) can be reduced significantly by using bidirectional pumping. If a band optimum length (BOL) is selected, a near optimum small signal gain (SSG) can be constant over broad pump wavelength regions due to the combined effects of ESA and ground state absorption (GSA). Hence, multilongitudinal mode, high power, reliable and inexpensive GaAlAs laser diodes can be used as pumping sources for EDFAs having SSG > 40 dB, noise figures of <4 dB, and output signal powers approaching 100 mW. These fibre amplifiers could be used as line repeaters, preamplifiers, and power amplifiers in different lightwave systems.<>
Keywords :
erbium; fibre lasers; laser modes; light absorption; optical communication equipment; optical pumping; 100 mW; 800 nm; GaAlAs laser diodes; alumino-phosphate-silicate; band optimum length; bidirectionally pumped; broad pump wavelength regions; erbium-doped fiber amplifiers; excited state absorption; fibre laser gain; ground state absorption; high power; lightwave systems; line repeaters; multilongitudinal mode; noise figures; optimum small signal gain; output signal powers; power amplifiers; preamplifiers; pump band; pumping sources; wavelength independent gain; Absorption; Diode lasers; Erbium-doped fiber amplifier; Laser excitation; Noise figure; Power amplifiers; Power system reliability; Preamplifiers; Repeaters; Stationary state;
Journal_Title :
Photonics Technology Letters, IEEE
