Zitu provide single mode fused biconic coupler (FBT) with very low insertion loss, low polarization dependence and excellent reliability. Single mode standard coupler and wideband coupler with coupling ratio from 50/50 to 1/99 are available to meet different customer’s requirement. FBT coupler can be performed optical splitting and monitoring in optical communication system and sensor field.
Features：
- Low Insertion Loss, Low PDL
- High Reliability
- Various Coupling Ratio
- Compact Size
Applications：
- Long-haul Telecommunications
- CATV Systems & Fiber optic Sensors
- FTTH & LAN
- Optical Testing System
FBT Specifications：
| Grade |
P Grade |
A Grade |
| Operating Wavelength（nm） |
1310,1490,1550 or custom wavelength |
| Operating Wavelength（nm） |
1310±40,1550±40,or custom wavelength |
| Coupling Ratio（%） |
50/50 |
3.4 |
3.6 |
| 40/60 |
4.4/2.5 |
4.6/2.8 |
| 30/70 |
5.6/1.8 |
6.0/2.0 |
| 20/80 |
7.4/1.1 |
7.7/1.3 |
| 10/90 |
10.8/0.6 |
11.6/0.8 |
| 5/95 |
14.2/0.4 |
14.6/0.5 |
| 2/98 |
18.5/0.2 |
19.0/0.3 |
| 1/99 |
21.0/0.2 |
21.5/0.3 |
| Polarization Dependent Loss (dB) |
0.15 |
0.2 |
| Directivity (dB) |
≥55 |
| Return Loss (dB) |
≥55 |
| Fiber Type |
Single mode |
| Pigtail Type |
250um Bar fiber or 0.9/2.0/3.0 Loose Tube |
| Operating Temperature(℃) |
-40~+85 |
| Storage Temperature(℃) |
-40~+85 |
| Package Dimension |
250um Bare Fiber |
Φ3.0mm×40mm or Φ3.0mm×54mm |
| |
0.9mm Loose Tube |
Φ3.0mm×54mm or Φ3.0mm×60mm |
