Selection guide
1x2 vs 2x2 PM Coupler
Choose 1x2 or 2x2 PM coupler topology before selecting wavelength, split ratio, power and package.
Use this page when
you already need a PM coupler but the required number of input/output paths is not yet fixed.
Quick comparison
| Selection point | 1x2 PM Coupler | 2x2 PM Coupler |
|---|---|---|
| Topology | One input, two outputs | Two-port coupling topology |
| Selection sequence | Topology → wavelength → split ratio | Topology → wavelength → split ratio |
| Product family | PM filter and PM fused couplers | PM filter and PM fused couplers |
| Key RFQ fields | Wavelength, split ratio, PM fiber, connector, qty | Wavelength, split ratio, PM fiber, connector, qty |
RFQ rule: The fastest inquiry includes the application plus wavelength, power, fiber, connector and quantity. If one parameter is unknown, send the known conditions for engineering review.
Which one should you choose?
Choose 1x2 PM Coupler when...
Choose 1x2 when the system needs one input split into two paths or one tap path.
Choose 2x2 PM Coupler when...
Choose 2x2 when the optical architecture specifically requires a 2x2 coupling topology.
Recommended starting points
Common questions
Is split ratio the first decision?
Port topology should be clear first; then select wavelength and split ratio.
Can the same product cover all wavelengths?
No. Use the listed operating bands and loss values for the selected wavelength family.
Still not sure which configuration fits?
Start engineering RFQSend the application and known parameters. Engineering can confirm the remaining specification.