All-optical regenerative memory using a single device

  • Nigel C. Johnson

    Student thesis: Doctoral ThesisDoctor of Philosophy


    In recent years the optical domain has been traditionally reserved for node-to-node transmission with the processing and switching achieved entirely in the electrical domain. However, with the constantly increasing demand for bandwidth and the resultant increase in transmission speeds, there is a very real fear that current electronic technology as used for processing will not be able to cope with future demands. Fuelled by this requirement for faster processing speeds, considerable research is currently being carried out into the potential of All-optical processing.
    One of the fundamental obstacles in realising All-optical processing is the requirement for All-optical buffering. Without all-optical buffers it is extremely difficult to resolve situations such as contention and congestion. Many devices have been proposed to solve this problem however none of them provide the perfect solution.
    The subject of this research is to experimentally demonstrate a novel all-optical memory device. Unlike many previously demonstrated optical storage devices the device under consideration utilises only a single loop mirror and a single SOA as its switch, whilst providing full regenerative capabilities required for long-term storage. I will explain some of the principles and characteristics of the device, which will then be experimentally demonstrated. The device configuration will then be studied and investigated as to its suitability for Hybrid Integrated Technology.
    Date of AwardOct 2009
    Original languageEnglish
    SupervisorKeith Blow (Supervisor)


    • non-linear optics
    • cross-phase modulation
    • all-optical memory
    • Terahertz Optical Asymmetric Demultiplexor
    • semiconductor optical amplifiers
    • hybrid integrated device

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