A curved guide for filamentary signal transmission media such as optical fibers has a curved surface with a radius of curvature greater than a critical radius. Fingers extending from the surface are designed to trap and hold fibers in close proximity to the surface, thus preventing too sharp bending...http://www.google.com/patents/US5530787?utm_source=gb-gplus-sharePatent US5530787 - Optical fiber guide for preventing sharp bends
