By placing a circulator at each end of a fiber link, one port is used for transmission and the adjacent port for reception, allowing two distinct light signals to travel simultaneously in opposite directions on the same physical strand. Thorlabs' Optical Circulators are non-reciprocating, one-directional, three port devices which are great for bidirectional propagation of light in a single fiber. This means that if light enters port 1 it is emitted from port 2, but if some of the emitted light is reflected back to the circulator, it does not come out of port 1 but. Fiber optic circulators act as signal routers, transmitting light from an input fiber to an output fiber, but directing light that returns along that output fiber to a third port. 0 dB; Fiber Type Panda PM The high power PM circulator is characterized with low insertion loss, high extinction ratio, high isolation, high power handling, high return loss, excellent environmental stability and.
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