Fiber opic filters have the characteristics of simple structure, low cost, easy manufacture, and good stability. The main reference parameters are low insertion loss, high return loss, and high reflectivity. Check the user's optical continuity when adding or troubleshooting, the small size of the reflector allows it to be conveniently placed in series at the user's end.

With the implementation of fiber-to-the-home (FTTH) projects, the coverage of optical networks has become larger and larger, and more and more users are involved. Therefore, it is particularly important to detect and maintain faults in the entire optical network quickly and accurately. Fiber optic filters will be widely used in FTTx network, PON OTDR test, central computer room reflectivity test, communication system link detection, etc.