Three Transducers Embedded into One Single SiC Photodetector: LSP Direct Image Sensor, Optical Amplifier and Demux Device

VIS/NIR wavelength selector based on a multilayer pi'n/pin a‐SiC:H optical filter

“…Taking into account the device configuration (Fig. 1), the front background irradiation is absorbed at the beginning of the front diode and, due to the self-bias effect [5], increases the electric field at the back diode where the red/infrared incoming photons (see Fig. 1) are absorbed accordingly to their wavelengths resulting in an increased collection.…”

“…7a), made out of a short-and a longpass filter was developed [5] and upgraded to include several input channels. In Fig.…”

“…The active device consists of a p-i'(aSiC:H)-n/p-i(a-Si:H)-n heterostructure with low conductivity doped layers. The deposition conditions and optoelec-tronic characterization of the single layers were described elsewhere [5]. The thicknesses and optical gap of the front i'-(200 nm; 2.1 eV) and back i-(1000 nm; 1.8 eV) layers are optimized for light absorption in the blue and red ranges, respectively [6].…”

“…The thicknesses and optical gap of the front i'-(200 nm; 2.1 eV) and back i-(1000 nm; 1.8 eV) layers are optimized for light absorption in the blue and red ranges, respectively [6]. Several monochromatic (λ IR,R,G,B,V ) pulsed communication channels (input channels) in the VIS/NIR range (400 nm-850 nm) are combined together, each one with a specific bit sequence, impinge on the device, and are absorbed accordingly to their wavelengths [5] (see arrow magnitudes in Fig. 1).…”

“…Newly developed technologies, for infrared telecommunication systems, allow increasing the capacity, reach and functionality leading to the design of new reconfigurable active filter [2][3][4]. To enhance the transmission capacity and the application flexibility of optical communication, efforts have to be considered, namely the development of wavelength division multiplexers (WDM) based on a-SiC:H light controlled filters, when different visible signals are encoded in the same optical transmission path [5]. They can be used to achieve different filtering processes such as: amplification, switching, and wavelength conversion.…”