Stock Code: 601869.SH / 06869.HK


Spun Fibre (SF)

YOFC's spun fibre is manufactured by spinning a polarization maintaining preform during the fibre drawing process, featuring high mechanical reliability and geometric consistency. The preform is deposited through Plasma Chemical Vapor Deposition (PCVD) process, which enables a precise refractive index profiles and dimensional tolerances of the fibre. Excellent environmental immunity and circular polarization-maintenance performance are obtained by design to meet the requirement of applications, such as fibre optic current transformer (FOCT).

With dual-layer, UV-cured acrylate coating, YOFC spun fibre has high environmental stability performance over the temperature range of -45℃ to +85℃ (-49 ℉ to +185 ℉ ).

  • Fibre optic current transformer
  • DC and AC current sensors
  • Polarimetric sensors
  • Excellent and stable optical performance
  • Optimized for current sensing
  • High environmental stability and reliability
  • Low attenuation


Fibre Type

SH 1310_125-5/250

Part No.


Optical Properties

Operating Wavelength (nm)


Fibre Cut-off Wavelength (nm) 1020 - 1260

Mode Field Diameter (μm)

7.0 ± 1.0 @1310nm

Attenuation (dB/km)

≤ 2.0 @1310nm

Beat Length (mm)

9 - 14 @1310nm

Geometrical Properties

Spin Pitch (mm)

5.0 ± 0.2

Cladding Diameter (μm)

125.0 ± 1.0

Coating Diameter (μm)

245.0 ± 7.0

Cladding Non-circularity (%)

≤ 1.0
Core/Cladding Concentricity (μm)

≤ 1.0

Coating Type


Mechanical Properties

Operating Temperature (℃)

-45 to +85

Proof Test (kpsi)

50 or 100


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