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Home > Products > Fibers & Probes > Fiber Technical Information > Bend Radius & Mechanical

Bend Radius & Mechanical

Optical fiber works by guiding light down the fiber core due to variations in index of refraction between the core and cladding. A flexible buffer material in one or more layers is then applied to improve flexibility and protect the glass core/cladding. Even with this additional coating, there are still limits on how tightly the fiber can be bent without being prone to microscopic fractures that can lead to breaks.

  • LTBR (long term bend radius): Observe as a minimum radius allowed for storage conditions.
  • STBR (short term bend radius): Observe as a minimum radius allowed during use and handling.

Mechanical Specifications: VIS/NIR, UV/VIS, SR fibers
Band Fiber Core Size Fiber Types Cladding Thickness Buffer Material Buffer Thickness Maximum OD Operating Temperature LTBR STBR
50um_fiber_band 50 ± 5 μm VIS/NIR, UV/VIS 35 ± 0.5 µm polyimide 17 ± 5 µm 155 µm -65 to 300 °C 4 cm 2 cm
100um_fiber_band 100 ± 3 μm VIS/NIR, UV/VIS 12 ± 5 µm polyimide 17 ± 3 µm 155 µm -65 to 300 °C 4 cm 2 cm
200um_fiber_band 200 ± 4 μm VIS/NIR, UV/VIS, SR 10 ± 4 µm polyimide 10 ± 5 µm 243 µm -65 to 300 °C 8 cm 4 cm
300um_fiber_band 300 ± 6 μm SR 15 ± 7 µm polyimide 20 ± 10 µm 380 µm -65 to 300 °C 12 cm 6 cm
400um_fiber_band 400 ± 8 μm VIS/NIR, UV/VIS, SR 20 ± 3 µm polyimide 20 ± 7 µm 487 µm -65 to 300 °C 16 cm 8 cm
500um_fiber_band 500 ± 10 µm VIS/NIR, UV/VIS 25 ± 3 µm polyimide 20 ± 10 µm 600 µm -65 to 300 °C 20 cm 10 cm
600um_fiber_band 600 ± 10 μm VIS/NIR, UV/VIS, SR 30 ± 3 µm polyimide 25 ± 10 µm 720 µm -65 to 300 °C 24 cm 12 cm
1000um_fiber_band 1000 ± 3 µm VIS/NIR 50 ± 3 µm acrylate 50 ± 40 µm 1120 µm -50 to 85 °C 30 cm 15 cm
1000  ± 20 µm UV/VIS 25 ± 3 µm acrylate 50 ± 40 µm 1065 µm -50 to 85 °C 30 cm 15 cm
  • VIS/NIR is multimode step index fiber with a low OH fused silica core and glass cladding (400 – 2100 nm)
  • UV/VIS is multimode step index fiber with a high OH fused silica core and glass cladding (300 – 1100 nm)
  • SR is multimode step index fiber with a high OH fused silica core and glass cladding (200 – 1100 nm)

Mechanical Specfications: XSR Fibers
Band Fiber Core Size Fiber Types Cladding OD Buffer Materials Primary Buffer OD Maximum OD Operating Temperature LTBR STBR
100um_fiber_band 113 ± 6 μm (115 μm nominal) XSR 125 ± 6 µm aluminum, polymer 150 µm 230 µm -50 to 80 °C 4 cm 2 cm
200um_fiber_band 230 ± 12 μm XSR 250 ± 13 µm aluminum, polymer 300 µm 380 ± 20 µm -50 to 80 °C 4 cm 2 cm
400um_fiber_band 455 ± 22 μm XSR 500 ± 25 µm aluminum, silicone, nylon 580 µm 1300 ± 100 µm -50 to 80 °C 8 cm 4 cm
600um_fiber_band 600 ± 30 μm XSR 660 ± 33 µm aluminum, silicone, nylon 800 µm 1700 ± 200 µm -50 to 80 °C 24 cm 12 cm
  • XSR is multimode step index fiber with a high OH fused silica core and fluorine-doped silica cladding (180 – 900 nm)

Mechanical Specifications: IR Fibers
Core Designation Fiber Core Size Fiber Types Cladding OD Buffer Materials Buffer OD Operating Temperature STBR LTBR
450 450 ± 15 μm fluoride 540 ± 15 µm acrylate 620 ± 25 µm -50 to 80 °C 15 cm 8 cm
500 455 ± 10  μm chalcogenide 515 ± 10 µm fluoropolymer, PVC 700 µm 0 to 100 °C 7.5 cm 7.5 cm
  • Fluoride fiber is multimode step index ZBLAN heavy-metal fluoride fiber (300 – 4500 nm)
  • Chalcogenide fiber is multimode step index fiber with an As2S3 core and As-S cladding (2000 – 6000 nm)

Mechanical Specifications: Single mode fibers 
Band Fiber Core Size Fiber Types Cladding OD Buffer Material Buffer OD Operating Temperature LTBR STBR
8um_fiber_band 8.2 ± 0.2 μm Single mode 125 ± 7 µm dual acrylate 245 ± 5 µm -60 to 85 °C 4 cm 2 cm
  • Single mode fiber is Corning SMF-28e+ fiber optimized for telecom use (1260 – 1700 nm)
  • Single-mode performance ceases below the cutoff wavelength of λc = 1260 nm