Multiple access interference rejection in OCDMA using a two-photon absorption based semiconductor device

• Main Authors: Dexter, K.J (Author), Reid, D.A (Author), Maguire, P.J (Author), Barry, L.P (Author), Tian, Chun (Author), Ibsen, Morten (Author), Petropoulos, Periklis (Author), Richardson, David J. (Author)
• Format: Article
• Language: English
• Published: 2009-04-01.
• Subjects: Article
• Online Access: Get fulltext

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).