The 1×2 1310 & 1550nm Dual Window Singlemode FBT Coupler Splitter With Steel Tube is a high-performance optical power-splitting device engineered for reliable operation across both 1310 nm (O-band) and 1550 nm (C-band) wavelengths. Manufactured using advanced Fused Biconical Taper (FBT) technology, this splitter ensures low insertion loss, high splitting accuracy, excellent wavelength stability, and consistent performance over dual operating windows, making it suitable for modern broadband and multi-wavelength communication systems.