Optoelectronic Digital Capture Device Based on Si/C Multilayer Heterostructures

Abstract

Combined tunable WDM converters based on SiC multilayer photonic active filters are analyzed. The operation combines the properties of active long-pass and short-pass wavelength filter sections into a capacitive active band-pass filter. The sensor element is a multilayered heterostructure produced by PE-CVD. The configuration includes two stacked SiC p-i-n structures sandwiched between two transparent contacts. Transfer function characteristics are studied both theoretically and experimentally. Results show that optical bias activated photonic device combines the demultiplexing operation with the simultaneous photodetection and self amplification of an optical signal acting the device as an integrated photonic filter in the visible range. Depending on the wavelength of the external background and irradiation side, the device acts either as a short-or a long-pass band filter or as a bandstop filter. The output waveform presents a nonlinear amplitude-dependent response to the wavelengths of the input channels. A numerical simulation and two building-blocks active circuit is presented and gives insight into the physics of the device.

Reconfigurable Photonic Logic Architecture: An Overview

“…The implementation of these mathematical constructs in hardware has been done with several techniques [20]. The basic logical functions can be implemented on a pi'npin device [21], as well as the Majority function, which is also known as the voting function [22].…”

“…The photocurrent to be useful must be time dependent, so the logic signal, even if does not have its state changed, must vary in time. This obliges the digital signals to be synchronized and differential, thus a digital light signal must be Manchester coded [20,21].…”

“…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].…”

Logic functions based on optical bias controlled SiC tandem devices

“…Under back illumination the blue channel is enhanced and the green and red are reduced (α V B >1 and α V R and α V G <1). It is then possible to ascribe a specific weight assigned to each bit position [24]. Due to the different optical gains (Fig.…”

Logical functions in a tandem SiC device

“…Another application is the identification of a FRET (Fluorescence Resonance Energy Transfer) signal [12] as well as multiplexer, demultiplexer functions and related add-drop applications [13]. It is the authors of the present manuscript short term aim to focus on the arithmetic and logical functions that can produce an adder and other complex digital functions [14].…”