 |
G657A2 Preform
KEEPTOP
| Quantity: | |
|---|---|
Effective Part Length（L effective） | 1500～2400mm |
Total Length（L total） | <=3500mm |
Preform Outer Diameter | 140~155mm |
Outer Diameter Fluctuations Within Preform | ≤16mm |
No Circularity Error | ≤1% |
Note：
Effective part length: the length including effective core rod of the preform. This part might be drawn into qualified optical fiber
Charging part length：there are 35mm form the joint of core road and handle at both sides will not be taken in charge; charging part length=effective length-70mm
Total length：the total length that including effective part length, start part length and handle part length;
Average outer diameter：Scan the effective part of the effective length area of the preform by 100mm step and then the average outer diameter can be calculated;
Outer diameter fluctuations within preform: The difference between the max outer diameter and min diameter of the effective length area within a preform;
Items | Specifications |
Bubbles in the core portion | 1) The bubbles having 0.5mm in diameter shall be allowed. |
Bubbles in the Cladding Portion | 1) The bubbles having 2.4mm in diameter shall be allowed. |
Thread-shaped white specks | The thread-shaped white specks having 0.5mm in diameter，and 8mm in length shall be allowed. |
Impurities except both white and black ones | The impurities except both white and black ones shall not be allowed. The area with these impurities shall be treat as unusual portion in length. |
Needle-shaped lumps on the surface | The lumps having 0.2mm in height shall be allowed. |
Scratches on the surface | The scratches having 0.5mm in depth, 10mm in length shall be allowed. |
Note：
When all the unusual appearance out of range in table 2, they shall be defined as the unusual part.
If concentrated impurities(specks, lumps, scratches) were found in preform, they shall be treated the same way as the concentrated bubbles.
Usable weight will be calculated by following formula(The density of quartz glass was 2.2g/cm3 ):
WCharged Portion =π/4 * 0D2avg * Lcha * 2.2/100 (g)
Lcha: charged length in Preform, Lcha=Total Effective Length –70mm- Total length contents all the defects.
Notes: there are 70mm effective part length was no-charged in the total preform. This no-charged part could be drawn into fiber.
The fiber drawn from the preform is excepted to meet the following characteristics in Table 3 by proper drawing condition.
Parameter | Values | Measurement | |
Attenuation | @1310nm | ≤0.344 dB/km | TIA FOTP 78 IEC 60793-1-40 |
@1383±3nm after H2 aging | ≤0.344 dB/km | ||
@1550nm | ≤0.204 dB/km | ||
Cable Cut-off Wavelength | ≤1260 nm | TIA FOTP 80 IEC 60793-1-44 | |
Mode Field Diameter @1310nm | 9.2±0.4 μm | TIA FOTP 191 IEC 60793-1-45 | |
Zero Dispersion Wavelength | 1300-1324 nm | TIA FOTP 175 IEC 60793-1-42 | |
Zero Dispersion Slope | ≤0.092 ps/(nm2•km) | ||
Cladding Non-Circularity | ≤1.0% | TIA FOTP 176 | |
Cladding Non-Circularity | ≤0.6μm | ||
Effective Part Length（L effective） | 1500～2400mm |
Total Length（L total） | <=3500mm |
Preform Outer Diameter | 140~155mm |
Outer Diameter Fluctuations Within Preform | ≤16mm |
No Circularity Error | ≤1% |
Note：
Effective part length: the length including effective core rod of the preform. This part might be drawn into qualified optical fiber
Charging part length：there are 35mm form the joint of core road and handle at both sides will not be taken in charge; charging part length=effective length-70mm
Total length：the total length that including effective part length, start part length and handle part length;
Average outer diameter：Scan the effective part of the effective length area of the preform by 100mm step and then the average outer diameter can be calculated;
Outer diameter fluctuations within preform: The difference between the max outer diameter and min diameter of the effective length area within a preform;
Items | Specifications |
Bubbles in the core portion | 1) The bubbles having 0.5mm in diameter shall be allowed. |
Bubbles in the Cladding Portion | 1) The bubbles having 2.4mm in diameter shall be allowed. |
Thread-shaped white specks | The thread-shaped white specks having 0.5mm in diameter，and 8mm in length shall be allowed. |
Impurities except both white and black ones | The impurities except both white and black ones shall not be allowed. The area with these impurities shall be treat as unusual portion in length. |
Needle-shaped lumps on the surface | The lumps having 0.2mm in height shall be allowed. |
Scratches on the surface | The scratches having 0.5mm in depth, 10mm in length shall be allowed. |
Note：
When all the unusual appearance out of range in table 2, they shall be defined as the unusual part.
If concentrated impurities(specks, lumps, scratches) were found in preform, they shall be treated the same way as the concentrated bubbles.
Usable weight will be calculated by following formula(The density of quartz glass was 2.2g/cm3 ):
WCharged Portion =π/4 * 0D2avg * Lcha * 2.2/100 (g)
Lcha: charged length in Preform, Lcha=Total Effective Length –70mm- Total length contents all the defects.
Notes: there are 70mm effective part length was no-charged in the total preform. This no-charged part could be drawn into fiber.
The fiber drawn from the preform is excepted to meet the following characteristics in Table 3 by proper drawing condition.
Parameter | Values | Measurement | |
Attenuation | @1310nm | ≤0.344 dB/km | TIA FOTP 78 IEC 60793-1-40 |
@1383±3nm after H2 aging | ≤0.344 dB/km | ||
@1550nm | ≤0.204 dB/km | ||
Cable Cut-off Wavelength | ≤1260 nm | TIA FOTP 80 IEC 60793-1-44 | |
Mode Field Diameter @1310nm | 9.2±0.4 μm | TIA FOTP 191 IEC 60793-1-45 | |
Zero Dispersion Wavelength | 1300-1324 nm | TIA FOTP 175 IEC 60793-1-42 | |
Zero Dispersion Slope | ≤0.092 ps/(nm2•km) | ||
Cladding Non-Circularity | ≤1.0% | TIA FOTP 176 | |
Cladding Non-Circularity | ≤0.6μm | ||
