1310/1550nm Singlemode In-Line Variable Optical Attenuator (VOA) is a high-performance fiber optic component designed for precise optical power control in singlemode fiber networks operating at 1310nm and 1550nm wavelengths. This in-line variable optical attenuator features continuously adjustable attenuation, low insertion loss, and high return loss for stable, repeatable results. Constructed with premium singlemode optical fiber and high-quality connectors, it is ideal for DWDM systems, optical testing, network simulation, and power equalization in FTTH, data centers, and telecommunication networks. The compact, robust design ensures reliable operation over a wide temperature range, making it suitable for both lab testing and field deployment.