Fiber Loopbacks

The fiber loopback family provides self-contained test modules that return the transmit signal directly into the receive channel of the port under test, letting a single technician verify transmitter output, receiver sensitivity and port mapping without a second device or a far-end loop. Duplex LC and SC loopbacks serve SFP, SFP+ and similar single-mode ports, with a fixed 3dB attenuated version that simulates a realistic link budget instead of a zero-loss short circuit. MTP/MPO loopbacks cover the parallel-optics generations from 8 to 24 fibers with Type 1 lane mapping, in male and female pin configurations, on OS2 single-mode and OM4 multimode glass. MMC loopbacks address the newest high-density transceiver interfaces at 16 and 24 fibers. Every module is optically tested before packing, with the insertion loss of the complete loop verified against its specification.

LC/SC Loopback Modules

LC UPC Duplex Fiber Loopback Module, OS2
Duplex LC UPC loopback for OS2 single-mode transceiver and link testing.

SC UPC Duplex Fiber Loopback Module, OS2
Duplex SC UPC loopback for OS2 single-mode port and link testing.

LC UPC Duplex Attenuated Fiber Loopback Module, OS2, 3dB
Duplex LC UPC loopback with fixed 3dB attenuation, simulating real link loss on OS2 links.

MTP/MPO Loopback Modules

MTP 8F Male Type 1 Fiber Loopback Module, OS2
8F MTP male Type 1 loopback for OS2 40/100G SR4-class port testing.

MTP 16F Female Type 1 Fiber Loopback Module, OS2
16F MTP female Type 1 loopback for OS2 400G DR4-class port testing.

MTP 12F Female Type 1 Fiber Loopback Module, OS2
12F MTP female Type 1 loopback for OS2 parallel-optics port testing.

MTP 24F Female Type 1 Fiber Loopback Module, OM4
24F MTP female Type 1 loopback on OM4 multimode for high-radix port testing.

MTP 8F Female Type 1 Fiber Loopback Module, OS2
8F MTP female Type 1 loopback for OS2 40/100G SR4-class port testing.

MPO 12F Female Type 1 Attenuated Fiber Loopback Module, OS2, 3dB
12F MPO female Type 1 loopback with fixed 3dB attenuation for OS2 parallel links.

MTP 12F Male Type 1 Fiber Loopback Module, OS2
12F MTP male Type 1 loopback for OS2 parallel-optics port testing.

MMC Loopback Modules

MMC 16F Female Type 1 Fiber Loopback Module, OS2
16F MMC female Type 1 loopback for OS2 MMC-interface transceiver testing.

MMC 24F Female Type 1 Fiber Loopback Module, OS2
24F MMC female Type 1 loopback for OS2 MMC-interface transceiver testing.

All loopback modules in this family are factory tested and shipped with dust caps fitted. When ordering, refer to the module by connector interface, fiber count, polish and attenuation; for other attenuation values, mapping types or connector combinations, send the test requirement with the enquiry and the factory will confirm the manufacturable specification.