The 2×2 1260~1620nm All Band Singlemode FBT Coupler Splitter With Steel Tube is a high-performance optical splitting and combining device engineered for reliable operation across the entire 1260–1620 nm telecom wavelength range, covering O, E, S, C, L, and U bands. Using advanced Fused Biconical Taper (FBT) technology, this broadband splitter ensures low insertion loss, excellent uniformity, precise splitting ratios, and outstanding wavelength stability throughout the full optical spectrum.