Description
Features of Fused Fiber Coupler
- Low addtional lost
- Low PDL
- Good stability
- Optional single window, dual window, triple window
- High wavelength isolation
- Small volume, light weight
- Optional split ratio, balanced or unbalanced splitter
Fiber Coupler Application
- Fiber optic communication system
- Fiber optic LANnetwork
- CATVnetwork
- FTTHnetwork
- Fiber optic sensor
- Measuring instruments
Fused Fiber Coupler Details
1×2 Single mode coupler is with extensive application to perform power splitting and monitoring functions in all kinds of optical communication systems in 20%:80%. The input pigtail is white loose tube SC/APC connector with IN mark, and the output pigtails are red and blue loose tubes with SC/APC connectors with split ratio 20:80, and the 20% connector insertion loss is less than 1.17dB, and that of 80% is less than 7.19dB.
Each fused fiber coupler 1×2 will be pack in blister boxes, safe and good protection, even in long time vibration transportation. You will find the product details specification on the test report: single mode wavelength 1310nm/1550nm dual window, single mode fiber G.657A1, Fiber length 1.0meter, Operating Temperature:-40~+85°C, connector type: SC/APC, package dimension: 3X60mm stainless steel tube, and the test data:
| Channel | IL (dB) | ||
| 1310nm | 1490nm | 1550nm | |
| CH1 20% Blue | 7.76 | / | 7.67 |
| CH1 80% Red | 1.05 | / | 1.14 |
| Uniformity(dB) @1310nm | / | PDL (dB) | ≤0.2 |
| Uniformity(dB) @1490nm | / | Directivity (dB) | ≥55 |
| Uniformity(dB) @1550nm | / | Return loss (dB) | ≥55 |
To better protect the 1×2 fiber optic coupler, during manufacturing, the ends of the circular steel tubes are sealed with end caps and adhesive to prevent air or dust from entering. The circular steel tubes have a diameter of 3mm and a length of 54mm or 60mm. Customers can also customize their own packaging sizes, such as ABS boxes or 10x90mm mini boxes, etc.
Coupling Ratio & Insertion Loss Chart of 1×2 Coupler
Yingda can provide fused tapered 1×2 FBT splitter with various coupling ratio, and the standard fiber optic coupler loss during production are as follows:
| Coupling Ratio | Insertion Loss | |
| 1×2 | Premium | A Grade |
| 40/60 | 4.7/2.7 | 5.0/2.9 |
| 30/70 | 6.0/1.9 | 6.4/2.1 |
| 20/80 | 7.9/1.2 | 8.5/1.4 |
| 10/90 | 11.3/0.5 | 12.0/0.8 |
| 5/95 | 14.0/0.35 | 14.6/0.43 |
| 1/99 | 22.5/0.25 | 23.0/0.35 |
| Coupling Ratio(%) | 1~50 | |
| Directivity (dB) | >55 | |
| Operating Temperature (℃) | -20 – + 85 | |
| Storage Temperature (℃) | -40 – + 85 | |
| Fiber Type | Corning Single mode SMF-28, DS Fiber, or flex core | |
| Fiber Pigtail Length (m) | 1 | |
| Port Configuration | 1×2 or 2×2 | |
| Package Dimension | 3x60mm Steel Tube | |











