The 4 Ports 1480nm Polarization Maintaining Optical Circulator is a high-performance, non-reciprocal passive optical device designed to direct light sequentially from Port 1 → Port 2 → Port 3 → Port 4, while precisely maintaining the polarization state of the transmitted signal. Operating at 1480 nm, it provides low insertion loss, high isolation, high return loss, and an excellent polarization extinction ratio (PER), making it ideal for advanced polarization-sensitive optical systems.