Project Description
DK Photonics uses unique fusing technique and polarization maintaining fiber to build the 780/850nm polarization maintaining fused coupler (PMC).The coupling ratio could be selected according to customer’s request. It features low excess loss, small size and high polarization extinction ratio. PMC is widely used for optical sensors and optical gyro.
The 1×2(2×2) Polarization Insensitive Fused PM Fiber Standard Coupler can be used to split high power linearly polarized light into two paths without perturbing the line are state of polarization (SOP).It can be operating on both Fast and Slow Axis.
If you do not see a standard PM Fused Coupler that meets your needs, we welcome the opportunity to review your desired specification and quote a custom PM fused Coupler. Requests for custom fiber pigtails, different wavelengths, tap Ratio and handling power of operation or other specific needs will be readily addressed.
| Features | Applications |
| · Low Insertion Loss
· High Extinction Ratio · Compact In-Line Package · Operating on both Fast and Slow Axis · High Stability and Reliability |
· Fiber Optic Instruments
· Fiber Amplifiers · Fiber Sensors · Coherent Detecting · Research |
Performance Specifications
| Parameter | Unit | Values | ||
| Configuration | – | 1×2 or 2×2 | ||
| Grade | – | P grade | A grade | |
| Center Wavelength | nm | 780,850 | ||
| Wavelength Range | nm | ±15 | ||
| Excess Lose | Typ. | dB | 0.5 | 0.7 |
| Max. | dB | 0.8 | 0.9 | |
| Mini. PER for Through Port | dB | 18 | 17 | |
| Min. Directivity | dB | 50 | 45 | |
| Min. Return Loss | dB | 50 | 45 | |
| Thermal Stability | dB/℃ | ≤0.005 | ||
| Max. Power Handling | W | 0.5, 2 | ||
| Max. Tensile Load | N | 5 | ||
| Fiber Type | – | PM850, Nufern PM780 fiber or other | ||
| Operating Temperature(℃) | – | -5 ~ +70 | ||
| Storage Temperature(℃) | – | -40 ~ +85 | ||
| Dimensions (Ф×L) | mm | Ф3.0×60, or Ф3.0×76 | ||
Max. Coupling Ratio Tolerance, @λc:
| Coupling Ratio | 1/99 | 2/98 | 5/95 | 10/90 | 20/80 | 30/70 | 40/60 | 50/50 |
| Tolerance for P grade (%) | ±0.4 | ±0.6 | ±0.8 | ±1.2 | ±2.0 | ±2.5 | ±2.5 | ±3.5 |
| Tolerance for A grade (%) | ±0.6 | ±0.8 | ±1.0 | ±2.0 | ±2.5 | ±3.5 | ±3.5 | ±5.0 |
- Above specifications are for device without connector, and the PM fused coupler is both axis working, no axis can be blocked; default test extinction ratio is on the slow axis. All parameters are tested at room temperature at central wavelength only.
- ER data listed in the table are for the ports with coupling ratio greater than 10%. It will be 2 dB lower for a tap port with coupling ratio between 1-10%. For 1% tap port, ER is not considered.
- For devices with connectors, IL will be 0.5dB higher, RL will be 5dB lower and ER will be 2dB lower. Power transmits through the connector less than 1W.The default connector key is aligned to slow axis.
Order information P/N: PMFBTC-①-②-③-④-⑤-⑥-⑦-⑧-⑨
When you inquire, please provide the correct P/N number according to our ordering information, and attach the appropriate description would be better. If need any connector, we do not recommend choosing a 250μm bare fiber pigtail.
| ① | ② | ③ | ④ | ⑤ | ⑥ | ⑦ | ⑧ | ⑨ |
| Grade | Port | Operating Wavelength | Power Handling | Coupling Ratio | Fiber Type for Tap Port (>5%) | Fiber Diameter | Fiber Length | Connector |
| P: P grade
A: A grade |
102:1×2
202:2×2 |
78:780nm
85:850nm 98:980nm 30:1030nm 64:1064nm 13:1310nm 15:1550nm XX: Others |
L:<0.5W 2:2W 5:5W 10:10W | 50:50/50
40:40/60 30:30/70 20:20/80 10:10/90 05:5/95 02:2/98 01:1/99 XX: Others |
0:SM fiber
1: PM Panda fiber |
25:250μm bare fiber
90:900μm Loose tube XX: Others |
08:0.8m
10:1.0m XX: Others |
00:None
FP: FC/PC FA: FC/APC SP: SC/PC SA: SC/APC LP: LC/PC LA: LC/APC XX: Others |
Part Number Example # 1: PMFBTC-PI-P-102-78-L-50-1-25-10-00
Description: 780nm 1×2 Polarization Insensitive Fused PM Fiber Standard Coupler, P grade, 300mW, 50:50 coupling ratio, 1.0m PM panda bare fiber, and no connector at all ports.
Part Number Example # 2: PMFBTC-PI-P-102-85-L-20-1-90-10-FA
Description: 850nm 2×2 Polarization Insensitive Fused PM Fiber Standard Coupler, P grade, 300mW, 20:80 coupling ratio, 1.0m PM panda fiber with 0.9mm loose tube, and FC/APC connector at all ports.
Ordering Information for Custom Parts
If you need to customize other specifications, please provide detailed description for your requirement.
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