The 3 Ports 1625nm Polarization Insensitive Optical Circulator is a high-performance non-reciprocal passive device designed to direct optical signals sequentially from Port 1 → Port 2 and Port 2 → Port 3 with minimal insertion loss and excellent isolation. Operating specifically at 1625nm, it is optimized for optical monitoring, fiber testing, and OTDR applications, where high wavelength selectivity and low polarization sensitivity are essential.