
When light is input from port 1, the light is output from port 2 almost without loss;
When light is input from port 2, the light is output from port 3 almost without loss;
When the light is input from port 2, the light will be output from port 1 with great loss;
When the light is input from port 3, the light will be output from port 2 and port 1 with great loss.The fiber optic circulator is a non-reciprocal device, which means that any change in properties caused by light passing through the device cannot be retained when passing through the opposite direction.
Advantage:

Low insertion loss

High isolation
Compact construction
High stability and reliability
Meets TelcordiaGR-1209 and GR-1221, meets ROHS standard
100% tested before delivery
Applications:Fiber Laser
Optical fiber sensor
Fiber amplifier
Field of optical communication
DWDM system