The 3 Ports 1310nm Polarization Maintaining Optical Circulator is a high-precision, non-reciprocal passive optical device designed to route light sequentially from Port 1 → Port 2 and Port 2 → Port 3, while preserving the polarization state of the transmitted light. Operating at 1310 nm, it provides low insertion loss, high isolation, and excellent polarization extinction ratio (PER), making it ideal for polarization-sensitive systems that require stable and repeatable signal transmission.