The 1×2 1310nm Single Window Singlemode FBT Coupler Splitter With Steel Tube is a high-precision optical power-splitting component designed for reliable signal distribution in singlemode fiber networks. Manufactured using Fused Biconical Taper (FBT) technology, this splitter provides low insertion loss, high splitting accuracy, and excellent wavelength stability at the 1310 nm single-window operating wavelength, making it ideal for O-band optical transmission systems.