Fiber optic
loopback plugs are designed for equipment testing, self-testing, engineering,
network diagnostics and measurement applications.These devices are typically
used for testing the transmission capability and receiver sensitivity of
network equipment,and play an important role in fiber optic link troubleshooting.
Fiber loopback is designed to provide a media of return patch for a
fiber optic signal; typically it is used for
fiber testing applications or network restorations. For the testing applications, the loopback signal is used for diagnosing a problem.