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Lisbon, Portugal

Louro P.,DEETC ISEL | Vieira M.A.,DEETC ISEL | Amaral S.,DEETC ISEL | Fernandes M.,DEETC ISEL | And 2 more authors.
Physica Status Solidi (C) Current Topics in Solid State Physics | Year: 2011

We present results on the use of multilayered a-SiC:H heterostructures as an integrated device for simultaneous measurement and wavelength-division demultiplexing of optical signals. These devices are useful in optical communications applications that use the wavelength division multiplexing technique to encode multiple signals into the same transmission medium. The device is composed of two stacked p-i-n photodiodes, both optimized for the selective collection of the photo generated carriers. Band gap engineering was used to adjust the photogeneration and recombination rates profiles of the intrinsic absorber regions of each photodiode to short and long wavelength absorption and carrier collection in the visible spectrum. The generated photocurrent signal was analyzed at reverse and forward bias and under steady state illumination. A demux algorithm based on the voltage controlled sensitivity of the device was proposed and tested. An electrical model of the WDM device is presented and supported by the solution of the respective circuit equations. Short range optical communications constitute the major application field. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Louro P.,DEETC ISEL | Vieira M.,DEETC ISEL | Fernandes M.,DEETC ISEL | Vieira M.A.,DEETC ISEL | And 2 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2011

In this paper we present results on the use of a multilayered a-SiC:H heterostructure as a wavelength-division demultiplexing device for the visible light spectrum. The proposed device is composed of two stacked p-i-n photodiodes with intrinsic absorber regions adjusted to short and long wavelength absorption and carrier collection. An optoelectronic characterisation of the device was performed in the visible spectrum. Demonstration of the device functionality for WDM applications was done with three different input channels covering the long, the medium and the short wavelengths in the visible range. The recovery of the input channels is explained using the photocurrent spectral dependence on the applied voltage. An electrical model of the WDM device is proposed and supported by the solution of the respective circuit equations. Short range optical communications constitute the major application field, however other applications are also foreseen. Copyright © 2011 American Scientific Publishers. Source


Louro P.,DEETC ISEL | Vieira M.,DEETC ISEL | Fernandes M.,DEETC ISEL | Costa J.,DEETC ISEL | And 4 more authors.
Physica Status Solidi (C) Current Topics in Solid State Physics | Year: 2010

In this paper we present results on the use of a semiconductor heterostructure based on a-SiC:H as a wavelengthdivision demultiplexer for the visible light spectrum. The proposed device is composed of two stacked p-i-n photodiodes with intrinsic absorber regions adjusted to short and long wavelength absorption and carrier collection. An optoelectronic characterisation of the device was performed in the visible spectrum. Demonstration of the device functionality for WDM applications was done with three different input channels covering the long, the medium and the short wavelengths in the visible range. The recovery of the input channels is explained using the photocurrent spectral dependence on the applied voltage. An electrical model of the WDM device is proposed and supported by the solution of the respective circuit equations. Short range optical communications constitute the major application field however other applications are foreseen. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA. Source

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