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Closed-loop control circuit implementation of the ADuC832 MicroConverter IC and the AD8305 logarithmic converter in a digital variable optical attenuator

Posted: 01 Jun 2010 ?? ?Print Version ?Bookmark and Share

Keywords:closed loop control? AD8305 logarithmic converter? circuit implementation?

Today's optical market may not seem very promising; this could be due mainly to the cyclical nature of the optical networking infrastructure. However, the major advancements of the recent past in the optical space cannot be ignored. Such advancements allowed for complete signal processing in the optical domain without the need to convert to the electrical domain. Also, because of its wide bandwidth and high density (DWDM) capabilities, optical fiber continues to be and will remain the medium of choice for data, voice, and video transport. The need to support such a medium was the reason behind the birth of countless optical devices. Optical attenuators, optical amplifiers (EDFA and Raman), laser diode drivers, and photodetectors are among these devices, just to name a few.

This application note focuses on the control circuitry, using the ADuC832 MicroConverter IC and the AD8305 logarithmic converter, for a MEMS-based, silicon, optical wave-guide, digitally controlled variable optical attenuator (DVOA).

View the PDF document for more information.

Click here to view related datasheets.

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