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- W70780109 abstract "In long passive optical fibres excited by narrow linewidth sources, stimulated Brillouin scattering (SBS) is the first non-linear effect to reach threshold [1]. In optically amplifying fibre, the SBS characteristics are drastically modified, and the threshold power can reach μ W levels [2]. This is particularly important in long lengths of fibre lightly doped with Erbium to provide distributed gain, as has been proposed for practical amplifier systems [3]. Above a certain threshold power, the electrostrictive phonon gain provided by interference of the forward pump and backward Stokes waves coherently amplifies the phonon population at the resonant frequency, resulting in a sudden stimulated surge in Stokes power. At sufficiently high pump powers, this process can continue, producing a cascade of successive Stokes orders. In passive fibre, the threshold power at which SBS becomes significant is governed by the temperature, the modal area and the pump laser linewidth [2]. In this paper, SBS in a 60 m long Erbium-doped fibre amplifier (EDFA) is explored for excitation by 80 nsec pulses at various different levels of EDFA gain. A cascade of first, second, third and fourth Stokes orders is observed; previous work reported only two Stokes orders under similar conditions [4]." @default.
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- W70780109 date "1993-01-01" @default.
- W70780109 modified "2023-10-18" @default.
- W70780109 title "Experimental Measurement of Multiple Brillouin Stokes Orders in a Fibre Amplifier Under Pulsed Excitation" @default.
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- W70780109 doi "https://doi.org/10.1364/nlgwp.1993.mb.3" @default.
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