Researchers from Laser Zentrum Hannover e.V., ant the Centre for Quantum-Engineering and Space-Time Research – QUEST, experimentally investigated the influence of amplified spontaneous emission within the Brillouin gain bandwidth on the Brillouin scattering of a single-frequency signal. The experiments were performed for the case of artificial amplified spontaneous emission (ASE) injected in backward direction into a passive fiber, as well as in forward direction of a low-power fiber amplifier.
A significant influence could be observed, when the ASE was counter-propagating to the signal. Injecting 160.6 nW of ASE within the Brillouin gain bandwidth led to a decrease of about 3 dB of the SBS-threshold of an approximately 335 m long passive fiber from about 80 mW to less than 40 mW. At a fixed signal power of 81 mW the backscattered power and the power in the Brillouin scattered Stokes maximum increased by a factor of 19.
Source: Optics Express, Vol. 20, Issue 10, pp. 10572-10582 (2012) http://dx.doi.org/10.1364/OE.20.010572
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