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Fiber Optic CirculatorsThorlabs’ Optical Circulators are non-reciprocating, one-directional, three port devices which are great for bidirectional propagation of light in a single fiber. We offer Single Mode (SM) and Polarization Maintaining (PM versions). These optical circulators are ideal for advanced communication systems and fiber sensor applications. Our single mode circulators also include a broadband circulator for OCT.