Single mode coupler
This Single-Mode Fused Coupler is a compact, high-performance passive component renowned for its low excess loss, high stability, and exceptional reliability. It is engineered with an epoxy-free optical path to ensure superior long-term performance under demanding environmental conditions. Available in a wide range of standardized and customized coupling ratios, it offers unparalleled design flexibility. The device is extensively utilized in long-haul telecommunications, CATV systems, and a variety of fiber optic sensing applications. It also serves as a critical component in the infrastructure of Fiber-to-the-Home (FTTH) and Local Area Networks (LAN) for efficient optical signal distribution and monitoring.
Description
Product Features & Applications
| Features | Applications |
| Low Excess Loss | Long-haul Telecommunications |
| Compact Size | CATV Systems & Fiberoptic Sensors |
| Various Coupling Ratio | FTTH & LAN |
| High stability and reliability | Local Area Network |
| Epoxy free on optical path |
Performance Specifications
Single Standard Couplers
| Parameter | P Grade | A Grade |
| Coupling Ratio（%） | 50/50 | 50/50 |
| Excess Loss (Typical)（dB） | 0.07 | 0.1 |
| Maximum Insertion Loss（dB） | 3.4 | 3.5 |
| Polarization Sensitivity (dB) | 0.15 | 0.2 |
| Operating Wavelength（nm） | 1310, 1480, 1550 or custom wavelength | |
Single Wideband Couplers
| Parameter | P Grade | A Grade |
| Coupling Ratio（%） | 50/50 | 50/50 |
| Excess Loss (Typical)（dB） | 0.07 | 0.1 |
| Maximum Insertion Loss（dB） | 3.4 | 3.5 |
| Polarization Sensitivity (dB) | 0.15 | 0.2 |
| Operating Wavelength（nm） | 1310, 1480, 1550 or custom wavelength | |
| Coupling Ratio Range（%） | 1~50 | |
| Directivity (Min.)(dB) | ≥55 | |
| Operating Temperature(℃) | -20~+80 | |
| Storage Temperature(℃) | -20~+80 | |
| Fiber Type | Corning singlemode SMF-28, DS fiber or flexcore | |
| Fiber Pigtail Length（m） | 1 | |
| Port Configuration | 1×2 or 2×2 | |
| Dimensions (mm) | Package D,E,F,G | |
Coupling Ratio/Insertion Loss Conversion Chart
| Coupling Ratio | Insertion Loss (P Grade) | Insertion Loss (A Grade) | ||||||
| 40/60 | 4.4/2.5 | 4.6/2.8 | ||||||
| 30/70 | 5.6/1.8 | 6/2.0 | ||||||
| 20/80 | 7.4/1.1 | 7.7/1.4 | ||||||
| 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 | 21.5/0.26 |
Package Dimensions & Pigtail Style
| Package Dimensions: | |
| Package D | 3mm x 45mm stainless steel tube |
| Package E | 3mm x 54mm stainless steel tube |
| Package F | 3mm x 60mm stainless steel tube |
| Package G | 10mm x 20mm x 90mm case |
| Pigtail Style: | |
| Package D,E | 250um bare fiber |
| Package F | 250um bare fiber or 900um loose tube |
| Package G | 2mm, 3mm cable or 900um loose tube |
The relation picture of Insertion & Wavelength、Temperature
Ordering Information
| Product | CWDM Device | Fiber Type | Connector | Fiber Length |
| 1=1*2 | 1480nm | 1=Bare fiber | FC/PC | 0=0.5m |
| 2=2*2 | 1550nm | 2=900um Loose tube | FC/APC | 1=1m |
| 3=1*3 | 1585nm | SC/PC | 2=2m | |
| 4=1*4 | 1310nm | SC/APC | ect. | |
| – | 850nm | ect. |
