Optoelectronic multiplexer for digital data processing based on lipid crystal pixels and optical fiber elements |
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Authors: | I Pérez J M S Pena J C Torres R Manzanares C Marcos C Vázquez |
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Institution: | (1) Grupo de Displays y Aplicaciones Fotónicas, Dpto. Tecnología Electrónica, Universidad Carlos III, Butarque 15, E-28911 Leganés, Madrid, Spain |
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Abstract: | In this work, we present an optoelectronic digital multiplexer 4:1 based on a multipixel nematic liquid crystal cell. This
device uses two optical control signals to select one among four possible optical data inputs. These data signals are generated
by four red LEDs, which are guided through plastic optical fiber towards liquid crystal pixels. For our purpose, only four
pixels of the cell will be used to modulate the optical signal across them. Each pixel will be addressed by a square waveform
coming from the conditioning circuit managed by a microcontroller system. The electronic control allows the multiplexer to
work as as simple two input logical gates such as AND, NAND, OR, NOR, XOR and XNOR. The operation time of the device is limited
by the response time of LC cell that is in the millisecond range. |
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Keywords: | optoelectronic digital multiplexer optical logic gate liquid crystal digital processing |
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