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.
Results
Showing 1 to 20 of 52 for “"Optical Amplifiers"”.
-
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. …
-
Linearly repeatered communication systems using optical amplifiers
… is an important parameter in the design of optical communication systems. Prior results on receiver sensitivity for on-off keying modulated direct detection systems with an optical preamplifier are generalized for the cases of frequency-shift keying and subcarrier modulation. Our results, …
-
Gain effect waveguide optical amplifiers for Si microphotonics
… grown by sputtering, and we investigated the optical materials quality of this process by studying sputtered SiO₂:Er; we report a record co-sputtered SiO₂:Er room temperature lifetime of 14 ms. PL versus heat treatment results strongly indicate the nitride environment of Si₃N₄ favors a higher …
-
Controlling Semiconductor Optical Amplifiers for Robust Integrated Photonic Signal Processing
… 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 photonic …
-
Bound-Free Emission and its Application to Broadband Optical Amplifiers
The potential for zinc and cadmium excimers to act as ultraviolet broadband ampli er media is investigated. A detailed presentation of the theory of bound-free emission and free-bound absorption is given. New internuclear potential curves for the B1 + u upper states of both cadmium and zinc …
-
Tunnel filters and optical amplifiers for use in fiber optic communication systems
… and double-layer dielectrics in which optical tunneling occurs are shown to serve as the basis of optical filters, the double-layer tunnel filter having a much higher resolution capability than the single-layer tunnel filter. Optical amplifiers used as a receiver preamplifier and as …
-
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 …
-
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. …
-
An investigation into using optical amplifiers for enhancing Brillouin based optical time domain reflectometry
… sensing fibre. This thesis investigates using optical amplification within the sensing fibre to enhance the range and the performance of the distributed Brillouin based sensors. To extend the range beyond this, remote amplification was also investigated using CW Raman amplification in which a …
-
Semiconductor Optical Preamplifiers for Use in High-Speed Integrated Photoreceivers at 1.3 Um and 1.55 Um
… as follows. First, double-heterostructure optical amplifier devices are characterized at 1.55 m m for AM modulation-frequency response up to 20 GHz, possibly for the first time. Experimental results include high-frequency effects due to facet reflectivity, as well as low-frequency effects …
-
The effects of noise in CATV distribution networks with star couplers and fiber amplifiers
… Networks. The use of star couplers and fiber amplifiers is an approach to overcome these problems and meet the increasing demand for large capacity and high quality. The capacity and performance analyses of three different network configurations are compared based on the results of computer …
-
Novel Segment Deformable Mirror Based Adaptive Attenuator Used In Wavelength Division Multiplexed Optical Communications Network
In wavelength division multiplexed (WDM) optical communication networks, signals are amplified periodically by optical amplifiers. Since the gain profiles of optical amplifiers are not flat, equalizers are usually used to maintain signal powers at different wavelengths in equal to avoid crosstalk …
-
Investigation into the unique coordination and spectroscopic properties of lanthanide ions with dipyridylamine and dipicolylamine based ligands.
… possible applications as biological sensors and optical amplifiers. Dipyridylamine and dipicolylamine based starburst compounds were synthesized and characterized. X-ray crystallography of ligands and a lithium complex, as well as photophysical properties were investigated and revealed that the …
-
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 …
-
Analysis and characterization of slab-coupled optical waveguide amplifiers and lasers
Semiconductor optical devices are important in the photonics industry due to their significant advantages in size, weight, and power consumption (SWAP) and to their capability for photonic integration. However, these devices traditionally suffer from low fiber coupling efficiency and have been …
-
Energy transfer and waveguide studies of Eu3+ and Tb3+ doped 2 SiO2-TiO2 glass prepared via the sol-gel route
… in the manufacture of short and compact optical amplifiers, yet quenching can reduce the performance of the amplifier. Sol-gel chemistry, combined with the dip-coating method is a means to develop rare-earth doped planar waveguides for such integrated optics components. The sol-gel …
-
Synchronization In Advanced Optical Communications
… is to generate high power ultrashort optical pulses from an all-semiconductor mode-locked laser system. The limitations of semiconductor optical amplifier in high energy, ultrashort pulse amplification are reviewed. A method to overcome the fundamental limit of small stored energy …
-
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 …
-
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 …
-
Indium phosphide based integrated photonic devices for telecommunications and sensing applications
… and medicine. In particular, an integrated all-optical logic gate and wavelength converter for fiber-optic telecommunications and an integrated tunable laser for trace-gas sensing are investigated in this thesis. These devices are fabricated in the indium phosphide (InP) material system, which …
Page 1 of 3