![]() ![]() Its configuration varies since the fiber count is not always the same in different applications. As for the MTP/MPO loopback, it is mainly used for testing parallel optics, such as 40G and 100G transceivers. ![]() ![]() The LC and SC loopbacks are made with simplex fiber cable and common connectors it’s not difficult to understand their configurations. In testing fiber optic transceiver modules, the most commonly used are LC, SC and MTP/MPO loopback cables. According to the optical connector type of the loopback, fiber loopback cables can be divided to LC, SC, FC, ST, MTP/MPO, E2000, etc. Based on the fiber type used, there is single-mode loopback and multimode loopback, available for different polishing types. This designing is more compact in size and stronger in use. Some vendors provide improved structure with a black enclosure to protect the optical cable. Generally, a fiber loopback is a simplex fiber optic cable terminated with two connectors on each end, forming a loop. Fiber optic loopback testing is the easiest way to ensure that the transceiver works faultlessly.Before deciding which loopback cable to use, we should firstly know the structure and classification of fiber loopback cable. Then we can compare the transmitted pattern with the received pattern to make sure they are identical and have no errors. Thus, during the testing process, the loopback module directly routes the laser signal from the transmitter port back to the receiver port. The former one is to send out laser signals and the latter is to receive signals. As we all know, fiber optic transceiver has two ports, a transmitter port and a receiver port. ![]() And the fiber loopback test can be utilized to check whether the fiber optic transceiver is working perfectly as designed. It is used as an aid in debugging physical connection problems. But here I’d like to introduce one of its common application-fiber optic loopback testing.Ī fiber loopback test is a hardware or software method which feeds a received signal or data back to the sender. Fiber optic loopbacks can be used in a number of applications such as equipment interconnection, device pig-tailing, premise networks, patch panel applications and communications connections. ![]()
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