Search for dissertations about: "dbr"

Showing result 11 - 15 of 22 swedish dissertations containing the word dbr.

  2. 11. Epitaxial growth optimization for 1.3-um InGaAs/GaAs Vertical-Cavity Surface-Emitting lasers

    Author : Zhenzhong Zhang; Mattias Hammar; Nicolae Chitica; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; VCSEL MOVPE InGaAs GaAs quantum wells; Semiconductor physics; Halvledarfysik;

    Abstract : Long-wavelength (1.3-μm) vertical-cavity surface-emitting lasers (VCSELs) are of great interest as low-cost, high performance light sources for fiber-optic metro and access networks. During recent years the main development effort in this field has been directed towards all epitaxial GaAs-based structures by employing novel active materials. READ MORE

  4. 12. Fabrication and Characterization of Integration Compatible Semiconductor Lasers

    Author : Mats Hagberg; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : This thesis deals with the fabrication and characterization of integration compatible semiconductor lasers. An extensive investigation of electron-beam lithography (EBL) and chemically assisted ion beam etching (CAIBE) for the fabrication of vertical ultra- high quality facets in GaAs, as well as a systematic characterization of grating coupled surface emitting lasers is presented. READ MORE

  5. 13. Opioid reducing strategies in post-operative pain management

    Author : Mariann Legeby; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : Adequate pain treatment is motivated by humanitarian grounds. It also seeks to reduce morbidity, improve recovery and diminish risks of persistent postoperative pain. The present Study I evaluates patient-controlled analgesia (PCA) against conventional nurse-administered opioid therapy. READ MORE

  6. 14. All-fibre optical sensor system for chemical sensing based on fibre Bragg grating technology

    Author : Adel Asseh; KTH; []
    Keywords : ;

    Abstract : This thesis deals with the realization of an all-fibresensor system for chemical sensing through the evanescentfield, based on fibre Bragg grating technology. The advantagesof all-fibre systems are most apparent for the potential userof the system. These systems are of small size, have highmobility, and require no precision alignment. READ MORE

  7. 15. Photonic devices with MQW active material and waveguide gratings : modelling and characterisation

    Author : Nadeem Akram; Lars Thylén; Hartmut Hillmer; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Method of Lines; Grating; ARROW Waveguide; Semiconductor laser; quantum well; Photonics; Fotonik;

    Abstract : The research work presented in this thesis deals with modelling, design and characterisation of passive and active optical waveguide devices. The rst part of the thesis is related to algorithm development and numerical modelling of planar optical waveguides and gratings using the Method of Lines (MoL). READ MORE