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 14 of 14 for “"Optical Bandwidth"”.
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Effect of Dispersion on SS-WDM Systems
… specifically a system employing a single-mode optical fiber. The system performance is expressed in term of the receiver sensitivity defined as the average number of photon per bit <i>N<sub>p</i> </sub>required for a given probability of bit error <i>P<sub>e</sub></i>. The receiver sensitivity …
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Design and Performance Analysis of Frequency-Shift Keyed Transmitter using Rapidly Tunable Lasers
Optical Frequency Shift Keying (FSK) is a modulation scheme that encodes data in the wavelength of a carrier signal. Due to the large amount of optical bandwidth available in the erbium, 1.55-𝜇m telecom band, FSK can potentially utilize a wide spectrum to achieve multi-Gb/s channel bandwidths. For …
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The colour of AuAgCu alloys
… of 250nm to 850nm at intervals of 10nm and an optical bandwidth of 10nm. The AuAgCu alloys were fabricated with an equilibrium temperature of 600 C as 10 x 20 x 1 mm plaquettes mounted in thermo-setting resin. The compositional range of the alloys covered the entire AuAgCu system in 10 weight …
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Sub-femtosecond precision timing distribution, synchronization and coherent synthesis of ultrafast lasers
… control and distribution of ultrafast optical pulse trains, with respect to pulse timing and phase. First, analytical analysis of the balanced optical cross-correlator (BOC) for attosecond precision pulse timing measurement is presented for both short and long crystal devices. It is …
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Delocalized Photonic Deep Learning on the Internet's Edge
… improvement, limited by the high energy and bandwidth cost of metallic interconnects. In this thesis I will demonstrate how we can build systems making use of the physics of photonics and electronics to enable computing systems on lightweight edge devices that were previously infeasible by …
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Advanced silicon photonics for microwave frequency down-conversion
… photonics is broadly defined as the study of optical devices operating in the microwave to millimeter wave spectrum, and interest in this field is continually driven by the need for higher electrical frequencies and larger signal bandwidths. However, electronic systems designed to meet these …
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Ultra-Wideband Fibre-Optic Systems in the Nonlinear Regime
Increasing transmission data rates and bandwidth efficiency urgently need to be solved for optical fibre communication systems to enable the tremendous growth of Internet traffic. Optical communication networks are mainly limited by the power-dependent fibre nonlinearity which limits the capacity …
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Development of high-speed vertical-cavity surface-emitting diode laser and vertical-cavity transistor laser for shortreach optical interconnects
… and provided more reliable and cost-effective optical interconnects (OIs) with improved data rate from 100 Mb/s to 1 Gb/s. The transition from proton isolated VCSEL to oxide confined VCSEL further advanced the data rate from 1 Gb/s to 10 Gb/s, and now 25 Gb/s NRZ oxide VCSELs are adopted in …
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Applications and noise properties of high repetition rate : TiSapphire frequency combs
… are a unique laser technology due to their broad optical bandwidth and potential for linking the optical and radio frequency domains when these lasers are configured as frequency combs. Ti:Sapphire based mode-locked lasers offer considerable advantages over other laser systems by generating both …
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MIMO RADIO-OVER-FIBRE DISTRIBUTED ANTENNA SYSTEM FOR NEXT GENERATION WIRELESS COMMUNICATION
… units (RAUs) from the base station via a single optical link. By using the DSB frequency translation, the original single-input-single-output (SISO) DAS can be upgraded into the MIMO DAS without implementing parallel optical links. Experimentally, the DSB frequency translation 2x2 MIMO RoF system …
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Analysis, Design and Performance Evaluation of Optical Fiber Spectrum-Sliced WDM Systems
… wavelength-division-multiplexing (WDM) in optical fiber systems. Conventional WDM systems employ laser diodes operating at discrete wavelengths as carriers for the different data channels that are to be multiplexed. Spectrum-slicing provides an attractive low-cost alternative to the use of …
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Monolithic electronic-photonic integration of the light-emitting transistor
… data are contributing to the ever increasing bandwidth requirement. It has become challenging to meet the demand for bandwidth, energy efficient and reliable optical interconnects. The development of an optical communication solution is broadened from the initial optical interconnect from …
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Novel solid state modulator for the infrared: the germanium chopper
… for considerable time for solid state broad optical bandwidth modulation in the infrared. The application requires modulation of the 8 to 14 µm band with high 'on' state transmission, although not necessarily a very low 'off' state transmission. Crucially this must be over a relatively large …
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Digital pulse interval modulation for optical communication systems
… schemes for transmission of information over optical fibres. PTM schemes are known to utilise the vast optical bandwidth to provide efficient transmission characteristics. Pulse code modulation is one such modulation scheme that has been used widely in various communication systems.</p> <p>In …