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Proceedings Paper

Optical bias selector based on a multilayer a-SiC:H optical filter
Author(s): M. Vieira; M. A. Vieira; P. Louro
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Paper Abstract

In this paper we present a MUX/DEMUX device based on a multilayer a-SiC:H optical filter that requires nearultraviolet steady state optical switches to select desired wavelengths in the visible range. Spectral response and transmittance measurements are presented and show the feasibility of tailoring the wavelength and bandwidth of a polychromatic mixture of different wavelengths.

The selector filter is realized by using a two terminal double pi’n/pin a-SiC:H photodetector. Five visible communication channels are transmitted together, each one with a specific bit sequence. The combined optical signal is analyzed by reading out the photocurrent, under near-UV front steady state background. Data shows that 25 current levels are detected and corresponds to the thirty-two on/off possible states. The proximity of the magnitude of consecutive levels causes occasional errors in the decoded information. To minimize the errors, four parity bit are generated and stored along with the data word. The parity of the word is checked after reading the word to detect and correct the transmitted data. Results show that the background works as a selector in the visible range, shifting the sensor sensitivity and together with the parity check bits allows the identification and decoding of the different input channels. A transmission capability of 60 kbps using the generated codeword was achieved. An optoeletronic model gives insight on the system physics.

Paper Details

Date Published: 22 August 2017
PDF: 9 pages
Proc. SPIE 10453, Third International Conference on Applications of Optics and Photonics, 1045309 (22 August 2017); doi: 10.1117/12.2271359
Show Author Affiliations
M. Vieira, Instituto Superior de Engenharia de Lisboa (Portugal)
CTS-UNINOVA (Portugal)
Univ. Nova de Lisboa (Portugal)
M. A. Vieira, Instituto Superior de Engenharia de Lisboa (Portugal)
CTS-UNINOVA (Portugal)
P. Louro, Instituto Superior de Engenharia de Lisboa (Portugal)
CTS-UNINOVA (Portugal)


Published in SPIE Proceedings Vol. 10453:
Third International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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