Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"semiconductor optical amplifiers"”.
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Stable Spatial Solitons In Semiconductor Optical Amplifiers
… the probability of using their interactions in optical data processing, communications etc. Up to now due to the power required to generate the solitons, and the response times of the soliton supporting media, these special waves of nature could not penetrate the applications arena. …
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Controlling Semiconductor Optical Amplifiers for Robust Integrated Photonic Signal Processing
… photonic integrated circuits based on versatile semiconductor optical amplifiers (SOAs). Control theory provides a mathematically robust set of tools for system analysis, design, and control. Although control theory is a rich and well-developed field, its application to the analysis and design of …
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Slow and Fast Light Using Quantum-Dot and Quantum-Well Semiconductor Optical Amplifiers
… light has great potential applications in future optical communication, photonic computing, and microwave signal processing. These applications have recently triggered immense experimental and theoretical interest in the research community. Numerous studies report large optical delays while …
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Demonstrating effective all-optical processing in ultrafast data networks using semiconductor optical amplifiers
… high-bandwidth applications such as video. All-optical signal processing is one promising technique for providing the necessary capacity and offers payload transparency, power consumption which scales efficiently with increasing bit rates, reduced processing latency, and ultrafast performance. …
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Design and simulation for the fabrication of integrated semiconductor optical logic gates
Development of ultrafast all-optical logic requires accurate and efficient modeling of optical components and interfaces. In this research, we present an all-optical logic unit cell with complete Boolean functionality as a representative circuit for modeling and optimization of monolithically …
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Photonic integrated circuits for optical logic applications
The optical logic unit cell is the photonic analog to transistor-transistor logic in electronic devices. Active devices such as InP-based semiconductor optical amplifiers (SOA) emitting at 1550 nm are vertically integrated with passive waveguides using the asymmetric twin waveguide technique and …
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Semiconductor-based all-optical switching for optical time-division multiplexed networks
All-optical switching will likely be required for future optical networks operating at data rates which exceed electronic processing speeds. Switches utilizing nonlinearities in semiconductor optical amplifiers (SOA) are particularly attractive due to their compact size, low required switching …
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Temperature-Dependent High-Speed Modulation and Wavelength Conversion Using Quantum-Well Lasers
… and wavelength conversion in long-wavelength semiconductor lasers is presented. The steady-state measurement of gain is presented through four different approaches, including the direct (Hakki-Paoli) measurement of polarization-resolved spectra, correlation of gain and spontaneous emission, …
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Wavelength agnostic WDM strategies for avionic telecommunications
… Division Multiplexing (WDM) in Passive Optical Networks (PONs) and how the network is affected by the harsh environment found on aircraft. The harsh environment presents a particular challenge with respect to the operational temperature range. Over this range it is desirable to minimise …
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Future Extensions to Passive Optical Access Networks
… that will provide transition towards all-optical infrastructures. An innovative prototype of a low-cost optical gigabit Ethernet switch is presented and its benchmark results are discussed. Scalability of the switch and its future applications in optical networks are studied. A prototype …
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High speed nonlinear optical components for next-generation optical communications
… in cost, size and/or energy consumption. Optical signal processing techniques may be deployed in next-generation optical networks for simple tasks such as wavelength conversion, demultiplexing and format conversion at high speed (≥100Gb.s-1) to alleviate the pressure on existing core …
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Integrated polarisation rotators
… and manipulate the state of polarisation of optical signals is becoming an increasingly desirable feature in numerous applications including integrated optical circuits, semiconductor optical amplifiers (SOAs) and optical communication systems. This thesis introduces the design, optimisation, …
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Development of Novel Compact Laser Sources for Bio-Medical Applications
… to the development and characterisation of novel semiconductor based lasers sources tunable in the broad spectral ranges that are unattainable by conventional lasers due to a lack of suitable laser gain materials.<br/><br/>Within the first part, the broad gain spectrum from quantum dot (QD) …
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Novel quantum dot and nano-entity photonic structures
… micro-ring structures and diffractive optical elements for sensing applications. Design, synthesis and characterization of nanocomposite materials in this context, involves QD incorporation in tailored-made polymers, synthesized using radical polymerization as well as QD embedment in …
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Analysis of Photonic Structures for Optical Networks
… el cálculo de la ganancia óptica en láseres de semiconductor de estructuras tipo bulk y de pozo cuántico para diferentes materiales, posteriormente los datos obtenidos se utilizan en el estudio de la Biestabilidad Óptica Dispersiva en este tipo de estructuras dentro de una cavidad Fabry-Pérot. …
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Contribución al estudio y optimización de dispositivos basados en holografía dinámica para su uso en redes ópticas pasivas multiplexadas en longitud de onda Wdm-Pon
… sintonizables y amplificadores ópticos de semiconductores. . ABSTRACT The utilization of Passive Optical Networks with Time Division Multiplexing (TDMPON), and more recently the use of Passive Optical Networks with Wavelength Division Multiplexing (WDM-PON), with its two main technologies, …
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Energy Efficient High Port Count Optical Switches
… shared memory space. Large-scale high-speed optical switches tend to use a rearrangeably non-blocking architecture as this limits the number of switching elements required. However, this comes at the expense of requiring more sophisticated route selection within the switch and also some forms …
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Scalable and Reconfigurable Optical Switches: From Network Design to System Application
… networks and datacentre networks. The optical switch has been the primary research topic in recent years since it shows great potential for meeting the requirements of large scalability, flexibility, energy efficiency and high bandwidth. The current optical switch fabric using …
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Οπτικά τηλεπικοινωνιακά συστήματα διασύνδεσης υψηλής φασματικής απόδοσης με πολυπλεξία μήκους κύματος και προηγμένες τεχνικές διαμόρφωσης
Οι απαιτήσεις των δικτύων διασύνδεσης, στα υπολογιστικά συστήματα υψηλής απόδοσης, αυξάνονται με αλματώδη ρυθμό τόσο σε χωρητικότητα, όσο και σε ρυθμούς σηματοδοσίας που πρέπει να εξυπηρετηθούν. Αυτή η αύξηση των ρυθμών σηματοδοσίας επιβάλλει την αντικατάσταση των ηλεκτρικών διακοπτών που …
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Μέθοδοι και τεχνικές βελτιστοποίησης της απόδοσης δικτύων οπτικών επικοινωνιών
Στις μέρες μας, οι αυξανόμενες απαιτήσεις για υπηρεσίες υψηλού φασματικού εύρους ζώνης επιβάλλουν την ανάπτυξη νέων τεχνολογιών στο σχεδιασμό των δικτύων νέας γενιάς, ικανές να προσφέρουν α) χαμηλό κόστος κατά το σχεδιασμό του συστήματος, β) μεγάλη απόσταση μετάδοσης, γ) πολλοί χρήστες και δ) υψηλό …