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Multilayered a-SiC:H device for Wavelength-Division (de)Multiplexing applications in the visible spectrum

Published online by Cambridge University Press:  01 February 2011

Manuela Vieira ,
Miguel Fernandes ,
Paula Louro ,
Manuel Augusto Vieira ,
Manuel Barata  and
Alessandro Fantoni
Manuela Vieira
Affiliation:
[email protected], ISEL, DEETC, Rua Conselheiro Emidío Navarro, Lisbon, 1900-019, Portugal, +351218317180, +351218317114
Miguel Fernandes
Affiliation:
[email protected], ISEL, Electronics Telecommunication and Computer Dept., Rua Conselheiro Emídio Navarro, Lisbon, 1959-007, Portugal
Paula Louro
Affiliation:
[email protected], ISEL, Electronics Telecommunication and Computer Dept., Rua Conselheiro Emídio Navarro, Lisbon, 1959-007, Portugal
Manuel Augusto Vieira
Affiliation:
[email protected], ISEL, Electronics Telecommunication and Computer Dept., Rua Conselheiro Emídio Navarro, Lisbon, 1959-007, Portugal
Manuel Barata
Affiliation:
[email protected], ISEL, Electronics Telecommunication and Computer Dept., Rua Conselheiro Emídio Navarro, Lisbon, 1959-007, Portugal
Alessandro Fantoni
Affiliation:
[email protected], ISEL, Electronics Telecommunication and Computer Dept., Rua Conselheiro Emídio Navarro, Lisbon, 1959-007, Portugal
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Abstract

A multiplexer is a device that combines two or more signals onto a single output without losing their specificity. In this paper we present results on the use of multilayered a-SiC:H heterostructures either as wavelength-division multiplexing or demultiplexing device (WDM). The WDM is a glass/ITO/a-SiC:H (p-i-n)/ a-SiC:H(-p) /Si:H(-i)/SiC:H (-n)/ITO double heterostructure which faces the modulated light incoming together from different beams, each one with a specific wavelength and period. By reading out, at different applied bias, the photocurrent generated by all the incoming optical carriers, the information is multiplexed or demultiplexed and can be transmitted and recovered again. The devices were characterized through spectral response measurements, under different electrical bias and frequencies. Results show that in the multiplexing mode the output signal is balanced by the wavelength of each incoming optical carrier and modulated by their frequencies. In the demultiplexing mode the photocurrent is controlled by the applied voltage and optical bias allowing to regain the transmitted information. An electrical model is presented to explain the device operation.

Keywords

sensorphotoconductivitymicroelectronics
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1066: Symposium A – Amorphous and Polycrystalline Thin-Film Silicon Science and Technology—2008 , 2008 , 1066-A08-01
Copyright
Copyright © Materials Research Society 2008

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References

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