Abstract
Although optical-fiber amplifiers with high gain are currently available, the effective optical power that can be launched into optical fibers is limited by stimulated Brillouin scattering (SBS). Two attempts have been made to overcome this problem. One was the application of periodic strain during the fiber drawing process,1 and the other involved stranding fibers into a cable with a double-helix structure.2 Both methods rely on the fact that the Brillouin frequency shift vB changes with the strain applied to the fibers.3 However, large residual stress is undesirable with respect to the long-term reliability of optical fibers because it increases the probability of fiber breakage due to fatigue.4
© 1993 Optical Society of America
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