On fiber backward scattering curve, attenuation difference tolerance between any actual attenuation of 500m length and average 500m:no more than 0.05db.

6. Cutoff Wavelength

Cutoff Wavelength of FOC: λcc ≤ 1260nm
Cutoff Wavelength of Optic Fiber: λc ≤ 1250mm

7. Dispersion

Zero Dispersion Wavelength Range: 1300 ~ 1324nm
Zero Dispersion Slope: ≤ 0.092 ps/nm²·km
Dispersion Coefficient Absolute Value:
- 1288~1339nm ≤ 3.5 ps/(nm·km)
- 1271~1360nm ≤ 5.3 ps/(nm·km)

8. 1550nm Wavelength Range

Dispersion Coefficient Absolute Value: ≤18.0ps/nm·km
1200nm~1600nm Dispersion Calculation Formula:

  Dispersion = D(λ) = (S₀ / 4) * [λ - (λ₀⁴ / λ³)] ps/(nm·km)

Mechanical Performance

Selection Test: 1% (0.7GPa, 8.6N, 100KPSI).
Dynamic Fatigue Coefficient: nd ≥ 0.
Coating Splitting Force Peak Value: 1.0 ~ 8.9N.
Coating Appearance: No gap and air bubble should be found.
within double coating layers.

Environment & Performance

Temperature characteristic test Temperature range: -60°C ~ +85°C, teo cycle time.
Additional attenuation coefficient under 1550nm wavelength: ≤ 0.05 dB/km.
Submerging test Fiber sample immersing in the water after 30 days under 23°C ± 2°C, allowed additional attenuation coefficient under 1550nm wavelength: ≤ 0.05 dB/km.
Steady damp heat test
Fiber places in condition that temperature is 85°C ± 2°C and relative humidity ≥ 85% for 30 days, allowed additional attenuation coefficient under 1550nm wavelength: ≤ 0.05 dB/km.