Light-triggered Silicon-carbon Pi'npin Devices for Optical Communications: Theoretical and Electrical Approaches

Maria Manuela de Almeida Carvalho Vieira, M. Vieira, João Costa, Paula Louro, M. Fernandes, A. Fantoni

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


In this paper a light-activated multiplexer/demultiplexer silicon-carbon device is analysed. An electrical model for the device operation is presented and used to compare output signals with experimental data. An algorithm that takes into accounts the voltage and the optical bias controlled sensitivities is developed. The device is a double pi'n/pin a-SiC:H heterostructure with two optical gate connections for light triggering in different spectral regions. Multiple monochromatic pulsed communication channels were transmitted together, each one with a specific bit sequence. The combined optical signal was analyzed by reading out, under different applied voltages and optical bias, the generated photocurrent across the device. Experimental and simulated results show that the output multiplexed signal has a strong nonlinear dependence on the light absorption profile, i.e. on the incident light wavelength, bit rate and intensity under unbalanced light generation of carriers. By switching between positive and negative voltages the input channels can be recovered or removed from the output signal.
Original languageEnglish
Title of host publicationMRS Proceedings
Number of pages6
Publication statusPublished - 1 Jan 2010
Event2010 MRS Spring Meeting -
Duration: 1 Jan 2009 → …


Conference2010 MRS Spring Meeting
Period1/01/09 → …


  • Simulated results
  • Spectral region
  • a-SiC:H
  • Applied voltages
  • Bit rates
  • Carbon devices
  • Communication channel
  • Device operations
  • Electrical models
  • Experimental data
  • Heterostructures
  • Incident light
  • Input channels
  • Light generation
  • Multiplexed signals
  • Negative voltage
  • Nonlinear dependence
  • Optical gates
  • Output signal


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