What is the working principle of the optical splitters ？

The beam splitter is data through the optical fiber transmission after a copy of the optical data for monitoring. Superficial said, the concept of optical splitter is similar to the meaning of the "three links", namely the original normal traffic flow, at the same time points out a for the use of monitoring equipment analysis.
Actually this is only the most simple of the beam splitter, the concept of technology development has produced a lot of kinds of optical splitter: convergence of the beam splitter can take multiple links, have put a link flow into several portions of the beam splitter, etc., have already can't use the word "three links" to simply summarized.