12.8.2020 | Circulator, optical
The optical circulator allows for optical add/drop multiplexing in conjunction of integrating a fiber Bragg grating (FBG) and is commonly used in long haul, metropolitan area networks and networks. In a circulator, the internal passive components are arranged so that light passes from port 1 to 2, from port 2 to 3 and from port 3 to 4 while preventing it from traveling in the opposite direction. Because each level of the circulator is identical, the steps can be repeated as many times as necessary.
