Title :
Laser diode pumped Er/sup 3+/-doped fiber amplifier in a 565 Mbit/s DPSK coherent transmission experiment
Author :
Whitley, T.J. ; Creaner, M.J. ; Steele, R.C. ; Brain, M.C. ; Millar, C.A.
Author_Institution :
British Telecom Res. Lab., Ipswich, UK
Abstract :
A laser-diode-pumped erbium-doped fiber amplifier, exhibiting 9-dB gain, has been operated as an in-line optical repeater in a 565-Mb/s coherent optical communications system. A sensitivity penalty of 0.4 dB was observed when the amplifier was positioned 35 dB away from the receiver, thus indicating a system improvement of 8.6 dB. By progressively reducing the coupling loss between amplifier and receiver, the noise figure of the contradirectionally pumped amplifier was calculated to be 5.4 dB, a value which is consistent with simple noise theory.<>
Keywords :
erbium; fibre optics; optical communication equipment; optical pumping; phase shift keying; repeaters; solid lasers; 5.4 dB; 565 Mbit/s; 9 dB; 9-dB gain; DPSK coherent transmission experiment; Er/sup 3+/-doped fiber amplifier; coherent optical communications system; contradirectionally pumped amplifier; coupling loss; in-line optical repeater; laser-diode-pumped; noise figure; receiver; sensitivity penalty; system improvement; Diode lasers; Erbium; Erbium-doped fiber amplifier; Erbium-doped fiber lasers; Laser excitation; Noise figure; Optical amplifiers; Optical receivers; Pump lasers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
