Multiple access interference rejection in OCDMA using a two-photon absorption based semiconductor device |
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| Authors: | KJ Dexter DA Reid LP Barry Morten Ibsen David J Richardson |
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| Institution: | a Research Institute for Networks and Communications Engineering, School of Electronic Engineering, Dublin City University, Dublin 9, Ireland
b Optoelectronics Research Centre, University of Southampton, Southampton, United Kingdom |
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| Abstract: | An experimental demonstration of a two-channel OCDMA system with detection performed using standard linear detection or a TPA-based nonlinear detector is presented. These results show an improvement in the extinction ratio of the decoded signal by ∼5 dB using TPA detection. A simulation model of the TPA detector used during the experiments was created and used in a four-channel OCDMA system simulation using both linear and nonlinear detection methods. The simulation results show that error-free performance is achievable for a 4-user system using the nonlinear TPA detector while the OCDMA system employing linear detection is severely limited by the effects of noise generated by adjacent optical channels (multiple access interference). |
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| Keywords: | Optical code division multiple access (OCDMA) Multiple access interference (MAI) Two-photon absorption (TPA) Optical thresholding and detection |
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