Selection guide
1×2 vs 2×2 PM Fiber Coupler Selection
PM coupler configuration depends on port topology, wavelength, splitting 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 enquiry includes the application plus wavelength, power, fiber, connector and quantity. If one parameter is unknown, send the known conditions for engineering review.
Configuration comparison
1x2 PM Coupler: application conditions
1x2 is an option when the system needs one input split into two paths or one tap path.
2x2 PM Coupler: application conditions
2x2 is an option when the optical architecture specifically requires a 2x2 coupling topology.
Common questions
Is split ratio the first decision?
Port topology, wavelength and splitting ratio jointly define the PM coupler configuration.
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?
Request a QuoteThe application and available parameters can support an initial review. Engineering can clarify the remaining configuration.