Optical circulator can be used to achieve bidirectional transmission on a single optical fiber. They are usually used in optical add/drop splitters (OADM), optical time domain reflectometers (OTDR) and dense wavelength division multiplexing (DWDM) networks . With high isolation of input and reflected optical power and low insertion loss, optical circulators are widely used in advanced Optical Fiber communication systems and fiber optic sensor applications.Opelink provides polarization insensitive and PM optical circulators. Our 3Port optical circulators feature with high isolation, low insertion loss, and excellent environmental stability.