16 Fibers MMC Female Type 1 Fiber Loopback Module, OM4

This 16-fiber OM4 MMC loopback combines a female APC connector with Type 1 mapping for multimode optical port diagnostics. It loops transmit paths back to the receive side without requiring a remote device. G.657.A2 glass, a 100mm internal loop and a 250mm overall assembly provide a compact tool for production, commissioning and fault-isolation work.

Product Highlights

• Fiber Type: OM4 50/125µm
• Fiber Connector: MMC Female, APC
• Glass Fiber: G.657.A2
• Cable Jacket: Plenum (OFNP)
• Fiber Count: 16 Fibers
• Fiber Mapping: Type 1

Use this loopback where the test setup explicitly calls for 16-fiber OM4 and Type 1 mapping. The MMC female APC interface must mate with the correct pinned APC port. Although OM4 and OS2 versions can share a connector family, their fiber characteristics differ, so the module should be labeled and stored distinctly in the test kit.

The passive loop introduces up to 0.7dB insertion loss and has at least 60dB return loss. Check whether that attenuation is appropriate for the transmitter and receiver under test. A successful loop can support port-function checks and burn-in; a failed loop still requires systematic investigation of the module, connector cleanliness, mapping and active electronics.

The assembly is rated for 50 mating cycles and has a 2.5mm OFNP cable with a 7.5mm minimum optical-fiber bend radius. Do not use the short loop as a pull handle. Clean and inspect the ferrule before insertion, cap it after testing and keep the 100mm loop free from sharp edges or tightly weighted cable bundles.

Specify LPM-OM4-16MMC for the 16-fiber OM4 Type 1 version, with quantity and required test-kit labels. Include the equipment test mapping if there is any uncertainty, so an alternative Type 2 custom module can be discussed instead.