The OC Series 1310/1550 three stage Optical Circulators are non-reciprocal devices that redirect light at 1310/1550 nm from port-to-port in only one direction while minimizing back reflection and back scattering in the reverse directions for any state of polarization. Our SM optical circulators have a center wavelength of 1064, 1310 (O-Band), or 1550 nm (C-Band). The device features low insertion loss, high isolation, compact size, high return loss, low polarization dependent loss, high stability and. The mini optical fiber circulator from Idealphotonics is a compact structure designed specifically for applications with limited space. The FC/PC and FC/APC connectors have a 2 mm narrow key.