The 1×2 1490 & 1550nm Dual Window Singlemode FBT Coupler Splitter With Steel Tube is a high-quality optical power-splitting device designed to deliver stable and precise optical performance across the 1490 nm and 1550 nm wavelength windows. Manufactured using advanced Fused Biconical Taper (FBT) technology, this splitter provides low insertion loss, high splitting accuracy, excellent wavelength stability, and reliable operation in dual-window fiber-optic communication systems.