Investigating the scalability of incoherent OCDMA systems based on ultrashort optical pulses

  • Tolulope Babajide Osadola

Student thesis: Doctoral Thesis


In a world where bandwidth hungry applications are constantly being churned out to an ever ready sea of consumers most of which are eager to experience the latest means of accessing information of various size and formats, there is an ever growing need for increased network capacity to cope with these demands. Optical code division multiple access (OCDMA) technology has long been researched as a possible solution for high bandwidth multi-access networking. The focus of my investigation is on incoherent OCDMA systems based on two-dimensional wavelength-hopping time-spreading (2D-WH/TS) incoherent OCDMA codes that utilize picosecond multi wavelength pulses. I have conducted experiments to characterise the encoding process of the incoherent optical CDMA transmitter which utilises low cost fibre Bragg gratings (FBG) based all optical encoders and decoders. I have tested the viability and practicality of the incoherent OCDMA system by conducting analysis of its performance under real-life conditions. I have investigated the performance of the picosecond code based optical signal when subjected to temperature variations similar to that experience by most buried fibre systems. I have proposed and demonstrated a novel hybrid system that combined the best of OCDMA and optical time division multiple access (OTDMA) to achieve increased network scalability. The field based demonstration was performed over a fully chromatic dispersion compensated 17-km bidirectional fibre link between Strathclyde and Glasgow University. The compensation of the chromatic dispersion of the link was maintained with sub-picosecond accuracy.
Date of Award31 Jul 2015
Original languageEnglish
Awarding Institution
  • University Of Strathclyde
SupervisorIvan Glesk (Supervisor) & Ivan Andonovic (Supervisor)

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