Variable Optical Attenuator with Integrated Control Based on Strongly Correlated Materials




Accurate optical attenuation in optical network systems and optical devices is currently achieved through the use of expensive, complex and bulky external sensors in combination with a linear controller. 


Description of Technology


This technology is a variable optical attenuator that attenuates infrared wavelengths. This attenuator does not require external optical sensors because it is controlled by a closely correlated electrical sensing system. Attenuator materials are able to be adjustable by relating the electrical properties under various conditions to the optical transmission. The device adjusts quickly and accurately over a wide range of wavelengths. 


Key Benefits

  • Integrated sensing capability
  • Lower power consumption
  • Fast response time
  • Small footprint
  • Low cost



  • Telecommunication Systems
  • Optics Control
  • Optical Amplifier Systems
  • Optical Multiplexing


Patent Status


U.S. patent application published, no. 20170168325. Foreign patent application, no. WO2015138694A3


Licensing Rights Available


Full licensing rights available 




Nelson Sepulveda Alancastro, Noraica Davila-Melendez, Emmanuelle Marced-Grafals


Tech ID




Patent Information:

For Information, Contact:

Raymond Devito
Technology Manager
Michigan State University