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 10 of 10 for “"Erbium-Doped Fibre"”.
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An investigation into using optical amplifiers for enhancing Brillouin based optical time domain reflectometry
Distributed fibre sensors have been successfully demonstrated and used in various industries for performing continuous measurements of the physical parameters such as temperature and strain. However, the measurement range and the performance of such sensors are limited by the intrinsic attenuation …
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The use of loop mirrors and chirped fibre Bragg gratings in actively-modelocked fibre lasers
… hardware. This thesis presents several novel fibre lasers which are useful pulse sources for high speed optical data processing and communications. They share several attributes in common: flexibility, stability and low-jitter output. They all produce short (picosecond) and are suitable as …
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Linear-cavity tunable fibre lasers employing an Opto-VLSI processor and a MEMS-based device
… experimentally two novel linear-cavity tunable fibre lasers employing an erbium-doped fibre (EDF) in conjunction with an Opto- VLSI processor and a MEMS-based device for wavelength selection. The Opto-VLSI processor and the MEMS-based device along with an optical collimator, a Bragg grating …
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Spectroscopy of thulium doped silica glass
The increasing demand for bandwidth in optical fibre communication systems has prompted a significant research effort into developing efficient fibre based optical amplifiers at operating wavelengths neighbouring the erbium-doped fibre amplifier. Of the possible candidates, thulium-doped fibre …
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Bragg grating filters for optical networks
This thesis focuses on the exploitation of fibre Bragg gratings in optical communication networks. New designs, as well as procedures for dynamically altering grating characteristics are proposed for several important functions. We begin with designing gratings for flattening the gain profile of an …
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Optical frequency comb generation in optical fibres
… by these instruments. Within this work, a fibre-based approach for generation of OFC specifically in the low- and medium resolution range is studied numerically. This approach consists of three optical fibres that are fed by two equally intense continuous-wave (CW) lasers. The first fibre …
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Optical waveguide analysis using transmission lines
Optical fibres have been used as a key medium for telecommunication and networking for more than two decades because in principle they offer sufficient transmission capacity, reaching total rates as high as Tbits/s per fibre. Critical fibre properties such as mode field profiles, single-mode …
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Dynamics of a Q-switched all-fibre laser
… and numerical investigations of self-pulsing in fibre lasers with a gain section and an absorber section via a mechanism known as Q-switching. In the context of an all-fibre laser, experimentally, we consider a Fabry-Perot resonator with sectional gain and absorption and their interaction while, …
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Gain and Noise Performance of Bi/Er Co-Doped Fibre Amplifiers
… attenuation. To solve this problem, optical fibre amplifiers, which have broadband amplification, high efficiency and high gain, are applied in optical communications. The typical widely used fibre amplifier is Erbium doped fibre amplifier (EDFA), which covers 1520- 1620nm. To satisfy the …
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High-power fibre lasers
… cladding-pumped, rare-earth (Yb3+, Er3+/Yb3+)-doped fibre lasers. Some of the main capabilities of fibre lasers such as: High brightness and thermal properties were exploited for the development of a variety of continuous wave (CW) and Q-switched devices, whose characteristics also includes …