Go!Foton’s Single Thermally Expanded Core (TEC) Fiber has an enlarged mode field diameter (MFD) obtained by heating a conventional single-mode fiber locally at high temperature (~1300 to 1450 deg C). The core expansion rate depends on the heating temperature and heating time. TEC fiber has the feature that although thermal diffusion changes the refractive index profile, the normal frequency does not change and hence the single-mode condition is maintained through the process.
Low Excess Loss
Durable for High Power
ROHS Compliant
Available in bare fiber and glass capillary pigtail
Large Expanded Region
Available in various MFD sizes
AR Coating option available
Mechanical Drawing:
*Polishing Length is the allowable length of the TEC Region that can be reduced without affecting the expected MFD of the TEC Fiber
| 20µm | 30µm | 40µm | |
| Initial Mode Field Diameter (µm) | 10.4* | ||
| Final Mode Field Diameter (µm) | 20 ± 2 | 30 ± 2 | 40 ± 5 |
| Cladding Diameter (µm) | 122~125 | ||
| TEC Region Length (mm) | 1.5 ± 0.5 | ||
| Polishing Length (mm) | ≤0.5 | ||
| Excess Loss (dB) | ≤0.10 | ≤0.10 | ≤0.15 |
| *Specification for initial mode field diameter is based on commercially available fibers and is dependent on the fiber structure. | |||
