download symbol WHITE PAPERS

download symbol2016 - Simultaneous blood flow and blood oxygenation measurements using a combination of diffuse speckle contrast analysis and near-infrared spectroscopy

download symbol2014 - Towards telecommunication payloads with photonic technologies

download symbol2013 - Trimodal detection of early childhood caries using laser light scanning and fluorescence spectroscopy: clinical prototype

download symbol2013 - A fiber-optic system for dual-modality photoacoustic microscopy and confocal fluorescence microscopy using miniature components

download symbol2012 - Miniaturized all-optical photoacoustic microscopy based on microelectromechanical systems mirror scanning

download symbol2011 - Effects of Radiation on MEMS

download symbol2011 - Digital optical tomography system for dynamic breast imaging

download symbol2006 - A flexible telecom satellite repeater based on microwave photonic technologies


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Sercalo's fiber optic Variable Optical Attenuator is based on an electrostatic MEMS mirror. A voltage between 0-5 V on the drive pin sets the optical attenuation. When power is removed the VOA returns into its default state.

There are 2 variants available with different default states: The normally open (bright) type or normally closed (dark) type.

The open type has its lowest loss state at 0 V. The dark variant reaches it’s lowest insertion loss at a voltage between 4.5 – 5V. It has better linearity at high attenuation. When the voltage is increased beyond the minimum point, the attenuation increases again.

The MEMS component is hermetically sealed. No epoxy is present in the optical path. The optical collimator is assembled using laser welding techniques: the result is good repeatability, long term stability and excellent reliability. The component withstands rugged environments. The part is designed to conform to Telcordia 1221reliability standards. It can directly be mounted on printed circuit boards.

The component is compliant to RoHS requirements2015/863/EU.