A smart pixel optical sensor based on positive optical feedback is described and demonstrated. The scheme uses the reflectance of an external scene as part of the positive feedback loop and uses the nonlinear characteristics of a vertical-cavity surface-emitting laser to obtain bistability and hysteresis. As a result, the continuous reflectance variation of the scene is mapped to a digital output with increased noise immunity for each pixel of the array.
© 2003 Optical Society of America
(100.1160) Image processing : Analog optical image processing
(100.2550) Image processing : Focal-plane-array image processors
(200.2610) Optics in computing : Free-space digital optics
(200.4650) Optics in computing : Optical interconnects
(250.7260) Optoelectronics : Vertical cavity surface emitting lasers
Mohammad Azadeh and Robert B. Darling, "Smart pixel optical sensor based on positive optical feedback," Opt. Lett. 28, 352-354 (2003)