Variable Optical Attenuators

High Power Inline Variable Fiber Attenuator up to 20W USB/RS232

This all-fiber variable optical attenuator (VOA) provides near-lossless transmission in its open (transparent) state while enabling electrically controlled attenuation up to 10 dB and handling optical power levels as high as 10 W. It operates by applying precise bending stress to the fiber using a motorized mechanism, allowing controlled attenuation without significantly degrading signal quality, and is designed to maintain a high polarization extinction ratio even under stress. The device offers ultra-broadband performance that preserves the fiber’s intrinsic transmission characteristics and is compatible with various fiber types. It is typically used in feedback control systems with an output tap monitor for precise power regulation, and because generated heat is transferred to the metal base, it must be mounted on an appropriate heat sink for safe and stable operation.