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Optics

Optics. The All-Optical Threshold Device. Stephen Brandes, NASA Apprentice Dr. Roger Dorsinville, Mentor Muhammad Ali Ummy, Graduate Student. The City College of New York. All-Optical Threshold Device. A device that can discriminate between two intensity levels is a Threshold Device.

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Optics

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  1. Optics The All-Optical Threshold Device Stephen Brandes, NASA Apprentice Dr. Roger Dorsinville, Mentor Muhammad Ali Ummy, Graduate Student The City College of New York

  2. All-Optical Threshold Device • A device that can discriminate between two intensity levels is a Threshold Device • Loop mirror contains SOA, attenuator, and 50:50 coupler • Phase change occurs in clockwise beam during transmission in 50:50 coupler • Destructive or constructive interference at the ports • To set a threshold value, attenuator is set to constant value while SOA is varied

  3. Experimental Setup

  4. Graphical Results

  5. Experimentation and Results • SOA set to three different gain levels • VOA varied periodically to change input intensity • Threshold values of all-optical threshold device were inversely proportional to the value of the SOA • In future, threshold device can be used for optical computing • Faster • More efficient

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