Fiber Loopback Plugs
Fiber Loopback Plugs
Fiber Optic Loopbacks feature single mode (9µm) and multimode (50µm /62.5µm) loopback plugs designed for equipment testing, self-testing, engineering, network diagnostics and measurement applications. Known also as loopback adapters, loopback cables or fiber optic loopback modules (incorporating two fiber optic connectors) these devices are typically used for testing the transmission capability and receiver sensitivity of network equipment. They are an important part of troubleshooting in laboratories and manufacturing environments. A high optical performance is achieved due to a precision ceramic ferrule.
FiberXP

- High durability and low loss performance
- MTP/MPO Loopback Adapters – 12-Core & 24-Core
- Integrated shell and boot design (on the encased style)
- Custom designed strain relief boot (on the standard looped style)
- Jacket Style: PVC
Fiber Loopback Plug Selector
The following dropdown menus make it simple to plug in a couple details and learn instantly which Fiber Loopback Plugs you need to order to support your requirement, or you can search through the full charts below.
FiberXP Fiber Optic Loopback Plugs
Stock No | Connector | Type | Micron Size | |
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682X268 | LC Loopback | Multimode | 62.5 µm |
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682X264 | LC Loopback | Multimode | 50 µm |
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682X272 | LC Loopback | Single Mode | 9 µm |
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682X280 | SC Loopback | Multimode | 62.5 µm |
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682X276 | SC Loopback | Multimode | 50 µm |
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682X284 | SC Loopback | Single Mode | 9 µm |
FiberXP Fiber Optic Loopback Adapters
Stock No | Connector | Type | Micron Size | |
682X266 | LC Loopback | Multimode | 62.5 µm | |
682X262 | LC Loopback | Multimode | 50 µm | |
682X270 | LC Loopback | Single Mode | 9 µm | |
682X278 | SC Loopback | Multimode | 62.5 µm | |
682X274 | SC Loopback | Multimode | 50 µm | |
682X282 | SC Loopback | Single Mode | 9 µm |
MTP/MPO Loopback Adapters
Stock No | Connector | Type | Micron Size | Fiber Cores | |
682X088 | MTP/MPO Loopback | Multimode | 62.5 µm OM1 | 12-Core | |
682X090 | MTP/MPO Loopback | Multimode | 50 µm OM2 | 12-Core | |
682X092 | MTP/MPO Loopback | Multimode | 50 µm OM3 | 12-Core | |
682X094 | MTP/MPO Loopback | Single Mode | 9 µm OS2 | 12-Core | |
682X095 | MTP/MPO Loopback | Multimode | 62.5 µm OM1 | 24-Core | |
682X096 | MTP/MPO Loopback | Multimode | 50 µm OM2 | 24-Core | |
682X098 | MTP/MPO Loopback | Multimode | 50 µm OM3 | 24-Core | |
682X100 | MTP/MPO Loopback | Single Mode | 9 µm OS2 | 24-Core |