5. Optical Add/Drop Multiplexer (OADM)OADM acts to channel in communication system, data can be received only light and channel information is entered to the destination by using channels (wavelengths), as well a well OADM can also insert added to original cables between stations. The basic operating principle of real devices display in OADM Figure 8, which is used as the primary device in a FBG to choose channels that echo through the FBG wavelength saengklap circulator to drop the channel went off. Similarly, the Information on the channel will be exported, or add into that other side (right in photo) of a FBG, where the light is traveling through a circulator in FBG laeosathon back through the circulator is exported to the destination. Characteristics of FBG fiber-line circulator and in practice, as shown. There is a small handle with a pencil and a length of just 5-15 cm device only. Figure 8 the basic structure of the OADM
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