Optical attenuators are devices for reducing the optical power of a light beam, for example a free-space laser beam or a telecom signal sent through an optical fiber. Some attenuators have a degree of attenuation which is either manually adjustable or can be controlled with an. 📦 For purchasing, use the RP Photonics Buyer's Guide for variable optical attenuators. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. We offer SM and PM electronic VOAs that provide control of the output power with FC/PC or FC/APC connectors. Our SM and PM manual VOAs are available. The etMEMS ™ series of free space variable optic attenuator (FS-VOA) is based on a proprietary patent pending micro-electro-mechanical mechanism featuring exceptionally compact size with large shutter movement, simple construction, and direct drive. "Free space" means air, outer space, vacuum, or something similar.
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