Fiber Optic Splitters/Couplers/Taps
780nm 1x2 Polarization-Maintaining (PM)
Description
These 1x2 Polarization-Maintaining (PM) Fiber Couplers are designed
for operation at 780 nm and are available with a 50:50, 60:40,
70:30, 75:25, 80:20, 90:10, or 99:1 coupling ratio. 1x2 couplers
have only one input port for simplified use and cable management.
These couplers are ideal for applications where light is split from
the input port into two output ports at the specified coupling
ratio; unlike WDMs, they are generally not recommended for beam
combining applications. The unused port is internally terminated
within the coupler housing in a manner that minimizes back
reflections.
PM couplers are manufactured using PANDA fiber which allows them to
maintain a high polarization extinction ratio (PER) when light is
launched along the slow axis of the fiber. As seen in the diagram
below, stress rods run parallel to the fiber's core and apply
stress that creates birefringence in the fiber's core, allowing
polarization-maintaining operation. Typical applications for PM
couplers include optical sensors, optical amplifiers, and fiber
gyroscopes.
Our PM Couplers provide a high PER (≥16 dB including connectors)
and a wide -40 °C to 85 °C operating range. Note that the PER will
vary with temperature; They have a maximum power handling of 500 mW
with connectors or bare fiber and a maximum power handling of 2 W
when spliced. These couplers undergo extensive testing and
verification of the PER; Testing results are included with a data
sheet that is shipped with couplers.
These couplers are available with 2.0 mm narrow key FC/PC or FC/APC
connectors. Fiber leads are jacketed in Ø900 µm Hytrel®* tubing and the leads are 0.8 m long. Custom coupler
configurations with other wavelengths, fiber types, coupling
ratios, alignment axes, or port configurations are also available.
Please contact us with inquiries.
*Hytrel® is a registered trademark of DuPont Polymers, Inc.
PANDA PM Fiber Cross Section
The connector key is aligned to the slow axis of the fiber.
Features
* 780 nm Polarization-Maintaining Fiber Optic Couplers
* 50:50, 60:40, 70:30, 75:25, 80:20, 90:10, or 99:1 coupling ratio
* 2.0 mm Narrow Key FC/PC or FC/APC Connectors
* 0.8 m Long Fiber Leads with a Tolerance of +0.075 m / -0.0 m
* Individual Test Report Included with Each Coupler
* Contact Us for Custom Wavelength, Coupling Ratio, and Connector
Options
Specifications
| Item | Specification |
| Port Configuration | 1x2 |
| Center Wavelength | 780nm |
| Bandwidth 1 | ±15nm |
| Excess Loss 1 | 0.5dB (Typ.), 0.8dB (Max.) |
| Extinction Ratio 2 | 18dB (Min.) |
| Return Loss 1 | 55dB (Min.) |
| Directivity | 50dB (Min.) |
| Max. Power Level 3 | 500 mW (With Connectors or Bare Fiber) 2 W (Spliced) |
| Fiber Type 4 | PM Panda Fiber |
| Polarization Axis Alignment | Both Axis Working |
| Package Size | Ø3.0 mm x 76.0 mm |
| Jacket | Ø900 µm Hytrel® Loose Tube |
| Pigtail Tensile Load | 5N |
| Operating Temperature Range | -40 to 85 °C |
| Storage Temperature Range | -40 to 85 °C |
| Coupling Ratio 1 | Coupling Ratio Tolerance | Coupling Ratio 1 | Coupling Ratio Tolerance |
| 50:50 | ±4.8% | 5:95 | ±1.5% |
| 40:60 | ±3.9% | 3:97 | ±0.8% |
| 30:70 | ±2.5% | 2:98 | ±0.7% |
| 20:80 | ±2.3% | 1:99 | ±0.5% |
| 10:90 | ±2.1% | 0.5:99.5 | ±0.2% |
Notes:
1. Values are specified with a slow axis launch at room temperature
without connectors and measured at the center wavelength through
the input port.
2. Specified with a slow axis launch at room temperature with
connectors and measured at the center wavelength through the input
port.
3. Specifies the total maximum power allowed through the component.
Coupler performance and reliability under high-power conditions
must be determined within the user's setup. See Usage Tips for
safety and handling information.
4. The fiber used in this coupler is compatible with patch cables
using Coherent’ PM780-HP fiber, Other fiber types may be available
upon request. Please contact us with inquiries.
Usage Tips
1. Before connecting a component to a system, make sure the light
source is turned off. Inspect both the input and output fiber ends;
debris or contamination on the end face can lead to fiber damage
when operated at high power.
2. After connecting the component, the system should be tested and
aligned using a light source at low power. The system power can be
ramped up slowly to the desired output power while periodically
verifying all components are properly aligned and that coupling
efficiency is not changing with respect to optical launch power.
3. Optical connectors can be removed and the device can be spliced
into a setup for operation at higher optical powers. Fiber ends
should always be cleaned and cleaved prior to splicing.
Ordering Information
Port Configuration,
Wavelength,
Coupling Ratio,
Package Type, Fiber Type,
Input: Connector Type, Cable Diameter, Cable Length
Other Special Requests
Example:
Polarization-Maintaining Fiber Coupler,
1x2,
780nm,
1:99,
Tube type, Corning Panda PM 850 fiber,
Input: FC/APC, 0.9mm, Black, 0.5 Meter,
Output 1: Bare fiber (Unterminated), 0.9mm, Red, 1.5 Meter,
Output 2: FC/APC, 0.9mm, Blue, 0.5 Meter.
*0.9mm Color-coded Tube
*Note: Customized Color-coded Combination is Available.
| Model No. | Description |
| FBT-P-102-780-50/50-AFC-CJ-PM850-10-T | Polarization-Maintaining Fiber Coupler, 1x2, 780nm, 50:50, Tube type, Corning Panda PM 850 fiber, Input: FC/APC, 0.9mm, 1 Meter, Output: FC/APC, 0.9mm, 1 Meter |
