Logic functions based on optical bias controlled SiC tandem devices

Abstract

The purpose of this paper is the design of an optoelectronic circuit based on a‐SiC technology, able to act simultaneously as a 4‐bit binary encoder or a binary decoder in a 4‐to‐16 line configurations and show multiplexer‐based logical functions. The device consists of a p‐i′(a‐SiC:H)‐n/p‐i(a‐Si:H)‐n multilayered structure produced by PECVD. To analyze it under information‐modulated wave (color channels) and uniform irradiation (background) four monochromatic pulsed lights (input channels): red, green, blue and violet shine on the device. Steady state optical bias was superimposed separately from the front and the back sides, and the generated photocurrent was measured.Results show that the devices, under appropriate optical bias, act as reconfigurable active filters that allow optical switching and optoelectronic logic functions development providing the possibility for selective removal of useless wavelengths.The logic functions needed to construct any other complex logic functions are the NOT, and both or either an AND or an OR. Any other complex logic function that might be found can also be used as building blocks to achieve the functions needed for the retrieval of channels within the WDM communication link. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Reconfigurable Photonic Logic Architecture: An Overview

“…(1) Equation 1, simplified as the exclusive OR (XOR) relation between Y and Invert inputs. If Invert is 0 the output follows Y input, otherwise it follows ~Y [26].…”

“…A visible digital light signal D is the multiplexed signal of two wavelength channels; from the long and from the short wavelength ranges. Represented as D [L, S] where L and S represent the channel color [26], long and short-wavelength range, respectively.…”

“…In all experiments till this point the optical bias was used as a steady lighting, namely in the digital light logical functions and WDM [18,21,26]. This optical bias paradigm has to be changed, and seen as two light Control signals; the Back and Front Control signals, to use the sensor as a volatile memory [31].…”