The 3 Ports 1310nm Singlemode Polarization Insensitive Optical Circulator is a high-performance non-reciprocal passive optical device designed to direct light sequentially from Port 1 → Port 2 and Port 2 → Port 3 while maintaining excellent optical performance independent of the input polarization state. Operating at 1310nm, it provides low insertion loss, high isolation, and stable signal transmission, making it ideal for various singlemode fiber applications.