Isolators / Circulators

Isolators
With the help of isolators, light can only be transmitted in a single direction through the fiber. Back reflections in the opposite direction are prevented to a large extent by higher attenuations. Polarization-independent and polarization-maintaining components are available.

Circulators
Circulators are passive components that transmit an optical signal from gate 1 to gate 2, another signal from gate 2 to gate 3, and so forth. Polarization-independent and polarization-maintaining components are available.