The normal recommendation for fiber optic cable is the minimum bend radius under tension during pulling is 20 times the diameter of the cable (d). Corning Optical Communications cable specification sheets are available which list the maximum tensile load for various cable types. The maximum pulling tension for stranded loose tube cable and ribbon cable is 600 lbF (2,700 Newtons). Damage may not always be obvious, like a kink in the cable, but may include broken fibers, fibers with higher loss due to stress and cable structural damage that may lead to reliability problems. If bent smaller than this radius, the internal structure of the cable will be under too much pressure, and.
[pdf] 6 (A) provides minimum wire-bending space dimensions at terminals and minimum width of wiring gutters. ter the cable has been placed in the raceway. When bent too sharply, helical metal tapes can eparate. These are minimum requirements and do not replace federal, state, local, or other applicable codes, laws, or regulations, which may have priority. ** Conductors smaller than 1/0 AWG shall not be connWhen installing insulated conductors of 4 AWG or larger, the minimum dimensions of pull or junction boxes installed in a raceway or cable run must comply with 314. The rules apply to “insulated” conductors for a reason. 10, also has its own specific Annex A which provides more explicit nformation for that cable type.
[pdf] The structure of the FBG can vary via the refractive index, or the grating period. The grating period can be uniform or graded, and either localised or distributed in a superstructure. The refractive index has two primary characteristics, the refractive index profile, and the offset. Typically, the refractive index profile can be uniform or apodized, and the refractive index offset is positive or zero. There are six common structures for FBGs;.
[pdf] 
