The minimum bending radius of optical fiber is the angle at which the fiber can be safely bent at any given point. The ITU-T (International Telecommunication Union Telecommunications Standards Branch) defines the minimum bending radius for various types of optical fibers.
Taking G.652D optical fiber as an example: after the optical fiber is loosely wound on a cylinder for 100 turns, the loss increase of 1625nm light wave should be less than 0.1dB. The radius of the thinnest cylinder that satisfies the above requirements is called the minimum bending radius of the optical fiber for the 1625nm light wave.
When installing and using optical fibers, we need to select the appropriate minimum bending radius according to different environments.
When the optical fiber is coiled, spliced, etc., its bending degree cannot be less than the minimum bending radius. Otherwise, it will bring great loss. Optical fibers with small bending radius are mostly used in scenarios including intra-rack fiber routing, inter-rack fibers, and indoors, such as optical fiber jumpers, tail fibers.
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