Avancerad sökning

Visar resultat 1 - 5 av 34 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Layered optical networks : implications to switching and transmission

    Författare :Stefan Larsson; KTH; []
    Nyckelord :;

    Sammanfattning : With the aim of supporting and enhancing high-capacitycommunication networks, such as telephony, Internet and others,this work has investigated:· transmission gains withtime-slotted optical communication, · performance ofoptical add/drop multiplexers (OADMs) and optical crossconnects(OXCs), · OXC networks serving Internet Protocol(IP)-routers, · packet hop reductions in IP-controlledoptical networks, · a simple optical neighbour discoverymethod, · economics of complementing a client network withan optical express layer.Time-slotting was shown to enable bi-directionaltransmission at the same frequency and multiwavelengthtransmission over dispersion-shifted fibre. LÄS MER

  3. 2. Optical Interconnection Architectures for High-Performance Computers and Switches

    Författare :Håkan Forsberg; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; optical interconnections; switch fabrics; planar integrated free-space optics; high-performance computers; hypercube topology; switches and routers; embedded signal processing;

    Sammanfattning : The incredible growth in processing power and switching capacity in high-performance computers and switches puts very high demands on the interconnection networks. This is recognized in particular in massively parallel processing and extreme switching architectures. The demands are such that new interconnection architectures must be considered. LÄS MER

  4. 3. Poled fiber devices

    Författare :Niklas Myrén; Fredrik Laurell; Faman Kashyap; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; optical physics; Poling; twin-hole fiber; fiber electrodes; silver film electrodes; silver diffusion; quasi-phase matching; optical switching; frequency conversion; optical modulation; Fysik; Physics; Fysik;

    Sammanfattning : The topic of this thesis is the development of devices for telecom applications based on poled optical fibers. The focus is on a specific function, optical switching/modulation. Some of the most important results are summarized below. Optical switching at telecom wavelengths (1. LÄS MER

  5. 4. VCSEL Techniques for Wavelength-Multiplexed Optical Interconnects

    Författare :Mehdi Jahed; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicon photonic integration; vertical-cavity surface-emitting laser; transverse and polarization mode filter; optical interconnect; distributed Bragg reflector.; wavelengthmultiplexing;

    Sammanfattning : The majority of global data communication is taking place within data centers where data is stored and processed and where the largest part of the power used for global networking is consumed. With the rapidly increasing use of Internet-based applications and services, data centers are equipped with a larger number of servers and switches requiring higher bandwidth connectivity. LÄS MER

  7. 5. Optical properties and helicity in liquid crystals

    Författare :Anders Dahlgren; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; de Vries formula; smectic A*; smectic helix; Poincaré sphere; homeotropic alignment; chiral; light switch; birefringence; electroclinic; diffraction method; indicatrix; phase grating; helial pitch; snisotropy; liquid crystals; smectic C*; handedness; book-shelf geometry; Cano method; ferroelectric; biaxiality; dielectric tensor;

    Sammanfattning : .... LÄS MER