Controlling Stimulated Brillouin Scattering (SBS)
アプリケーションノート
The transmission and measurement of optical power through kilometer lengths of optical fibers is degraded by the nonlinear effect of Stimulated Brillouin Scattering, SBS. The SBS effect causes excessive amounts of input power to be reflected within the fiber, limiting the achievable transmitted power. By controlling the linewidth of the optical source, ideally without adding noise, the SBS problem can be avoided and high optical power can be launched into the fiber.
Introduction
SBS stands for Stimulated Brillouin Scattering and is a problem for high laser power in long fibers. If there is high laser power with a narrow linewidth along the fiber, the SBS effect causes much light to be reflected. This limits the power that can be transmitted and makes the signal noisy. Therefore SBS is an issue for optical transmitters in optical networks and for instruments that test components or systems with long fibers. Such tests can include measuring the power budget of an amplified or unamplified transmission span, or testing Raman amplifier configurations. Fibers exhibiting SBS at power levels of interest to telecommunications are usually at least several kilometers in length, but this depends on the type of fiber.
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