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Visar resultat 1 - 5 av 82 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Fibre Bragg Grating Components for Filtering, Switching and Lasing

   Författare :Zhangwei Yu; Lars Thylén; Pierre-Yves Fonjallaz; Lin Zhang; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fibre Bragg grating; photosensitivity; apodization; chirp; phase-shift; microwave optical filtering; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

   Sammanfattning : Fibre Bragg gratings (FBGs) are key components for a vast number of applications in optical communication systems, microwave photonics systems, and optical sensors, etc. The main topic of this thesis is fibre Bragg grating fabrication and applications in direct microwave optical filtering, high speed switching and switchable dual-wavelength fibre lasers. LÄS MER

3. 2. Multi-level modulation formats for high-speed optical transmission systems

   Författare :Ekawit Tipsuwannakul; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; quadrature amplitude modulation; spectral efficiency; differential detection; modulation format; coherent detection; phase shift keying;

   Sammanfattning : Over the past several years, the use of multi-level modulation formats has enabledsignificant improvements in the field of optical fiber communication, particularlyin terms of per-channel bit-rate (i.e., line-rate) and spectral efficiency (SE), byencoding multiple bits per symbol. LÄS MER

4. 3. Programmable and Tunable Circuits for Flexible RF Front Ends

   Författare :Naveed Ahsan; Aziz Ouacha; Sten Gunnarsson; Linköpings universitet; []
   Nyckelord :Microwave circuits; phase shifters; programmable circuits; active corporate feed network; four-port circuit; generic cells; phase shift capability; programmable microwave function array; tunable recursive filter; TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : Most of today’s microwave circuits are designed for specific function and specialneed. There is a growing trend to have flexible and reconfigurable circuits. Circuitsthat can be digitally programmed to achieve various functions based on specific needs. LÄS MER

5. 4. Stimulated scattering processes and cross-phase modulation effects in optical fibres

   Författare :Anders Höök; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; phase-shift keying; walk-off; optical fibres; cross-phase modulation; transient stimulated Brillouin scattering; stimulated Raman scattering;

   Sammanfattning : .... LÄS MER

7. 5. Quantum Interference : Improved Accuracy and Quantum Limits

   Författare :Jonas Söderholm; KTH; []
   Nyckelord :Quantum interference; quantum limits; phase-shift detection; quantum optics;

   Sammanfattning : .... LÄS MER