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Fiber optic adapters (also called couplers) are designed to connect two fiber optic patch cables together. They come in versions to connect single fibers together (simplex), two fibers together (duplex), or sometimes four fibers together (quad) and even eight fibers together.
Adapters are designed for multimode or singlemode cables. The singlemode adapters offer more precise alignment of the tips of the connectors (ferrules). Note: It is ok to use singlemode adapters to connect multimode cables, but you should not use multimode adapters to connect singlemode cables. This can cause misalignment of the small singlemode fibers and loss of signal strength (attenuation).
| Characteristics | Unit | Single mode UPC |
| Insertion Loss (IL) | dB | ≤0.2 |
| Exchangeability | dB | IL≤0.2 |
| Repeatability (500 remates) | dB | IL≤0.2 |
| Sleeve material | -- | Zirconia Ceramic |
| Housing Material | -- | Plastic |
| Operating Temperature | °C | -20°C~+70°C |
| Storage Temperature | °C | -40°C~+70°C |