Reach Optics provide optical circulator with extra high isolation, Low insertion and return loss,  Low polarization dependent loss and polarization mode dispersion.

Optical circulator 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. 

Optical circulators perform a similar function as an optical isolator, protecting the input fiber from return power, but also allowing the rejected light to be employed.

Reach Optics' Optical circulators include 3-port type and 4-port type. Passing all the intermediate ports in sequence. Optical light transmitted from any of the port in such circulators can be redirected to any other port.