Fiber Circulator for sale 3 Port PM 1550nm Circulator 1.3 Port PM 1310 Circulator Optical circulators are similar to electronic circulators in that both perform similar functions. An optical circulator is a three-port device that allows light to travel in only one direction. Signals entering port 1 will exit port 2 with minimal loss, and signals. 2.OOPTICO's polarization-maintaining (PM)...