LC loopback modules have two LC connectors connected to each other. This LC loopback is designed to provide a media of return patch for a fiber optic signal. Using fiber optic loopback modules for data transmission, the signal emitted by the device is looped from the transmit (Tx) end of an active component back to the receive (Rx) end of the same component. Typically, it is used for fiber optic testing applications or network restorations. For the testing applications, the loopback signal is used for diagnosing a problem. LC Fiber Loopback Module is absolutely an economical solution for a number of fiber optic test applications.