The 3 Ports C+L 1528~1610nm Singlemode Polarization Insensitive Optical Circulator is a passive optical device designed for C-band and L-band optical communication systems. It efficiently transmits optical signals in a fixed direction (Port 1 → Port 2 → Port 3) while maintaining low insertion loss and high isolation. Its polarization-insensitive design ensures stable signal transmission, and the compact package enhances system reliability. Widely used in DWDM optical networks, optical amplification (EDFA/Raman), fiber optic sensing, and bidirectional optical communication, this circulator helps optimize signal quality, reduce power loss, and improve optical path control, making it an ideal choice for high-performance optical networks.