Sökning: "phase-shift"

Visar resultat 1 - 5 av 64 avhandlingar innehållade ordet phase-shift.

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

    Detta är en avhandling från Stockholm : KTH

    Författare :Zhangwei Yu; KTH.; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fibre Bragg grating; photosensitivity; apodization; chirp; phase-shift; microwave optical filtering; TECHNOLOGY Electrical engineering; electronics and photonics; TEKNIKVETENSKAP 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

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

    Detta är en avhandling från Stockholm : KTH

    Författare :Ekawit Tipsuwannakul; [2012]
    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

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

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Naveed Ahsan; Linköpings universitet.; Linköpings universitet.; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 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

  4. 4. Quantum Interference : Improved Accuracy and Quantum Limits

    Detta är en avhandling från Kista : Mikroelektronik och informationsteknik

    Författare :Jonas Söderholm; KTH.; [2002]
    Nyckelord :Quantum interference; quantum limits; phase-shift detection; quantum optics;

    Sammanfattning : .... LÄS MER

  5. 5. Multidimensional Modulation Formats for Coherent Optical Communication Systems

    Detta är en avhandling från Kista : Mikroelektronik och informationsteknik

    Författare :Tobias Eriksson; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; binary pulse position modulation QPSK; Fiber-optical communication; spectral efficiency; power efficiency; multidimensional position modulation.; 16-ary quadrature amplitude modulation 16QAM ; quadrature phase shift keying QPSK ; coherent detection; polarization-switched quadrature phase shift keying PS-QPSK ; 128-level set-partitioning QAM 128-SP-QAM ;

    Sammanfattning : Coherent optical receivers have enabled the use of multilevel modulation formats with high spectral efficiencies and long transmission reaches. Traditionally, modulation formats utilizing the two dimensions spanned by the amplitude and the phase of the signal have been dominating. LÄS MER