Microbends of Fibers
Microbends are microscopic bends of an optical fiber, which can cause bend losses (bend-induced propagation losses) even when the fiber is macroscopically kept straight. Also, they influence the polarization mode dispersion.
Microbends largely arise not during the process of pulling the fiber from the preform, but when the fiber is cabled or spooled. Of course, the amount of microbends depends strongly on the cabling or spooling technology. For modern telecom fibers, microbends are carefully minimized.
It is also possible to intentionally introduce microbends e.g. in order to realize a special kind of fiber Bragg grating .
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