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KIT – University of the State of Baden-Württemberg and National Large-scale Research Center of the Helmholtz Association www.kit.edu Laser structuring of glass panel for optimized chip-to- waveguide interconnection Fraunhofer-Institut für Zuverläsigkeit und Mikrointegration IZM Fahd Rushd Faridi MSc. “Optics & Photonics”, November, 2014

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  • KIT University of the State of Baden-Wrttemberg and National Large-scale Research Center of the Helmholtz Association

    M.Sc. Optics & Photonics, November, 2013

    www.kit.edu

    Laser structuring of glass panel for optimized chip-to-waveguide interconnection

    Fraunhofer-Institut fr Zuverlsigkeit und Mikrointegration IZM Fahd Rushd Faridi

    MSc. Optics & Photonics, November, 2014

  • 2 Karlsruhe School of Optics & Photonics (KSOP) Schlossplatz 19 | 76131 Karlsruhe (Germany) | Phone: +49 (0)721 608 47880 | Fax: +49 (0)721 608 47882

    Laser structuring of glass panel for optimized chip-to-waveguide interconnection

    Motivation

    Approach

    Laser Structuring

    Process Optimization

    Results

    Summary

  • 3

    Motivation

    Problem

    Ever increasing data rates in information processing systems

    High energy consumption in data centers and server firms

    Integration of electronic circuits is reaching its limit

    Solution

    Optical data transmission and optical interconnects

    Challenges

    Embedded optical architectures do not exist in data center and network systems

    A lack of photonic system integration in printed circuit boards

    Partially developed basic technologies

    Karlsruhe School of Optics & Photonics (KSOP)

    Schlossplatz 19 | 76131 Karlsruhe (Germany) | Phone: +49 (0)721 608 7880 | Fax: +49 (0)721 608 7882

  • 4

    Approach

    Exploring synergies using novel mix and match linkups

    Prototypes are developed in three hierarchy levels of optical transmission

    1st hierarchy level :

    Facilitate optical transmission on a printed circuit

    Reduce energy consumption by 50%

    Optical transmission on a printed circuit

    Optical chip assembly on glass panel

    Waveguide patterning on glass panel

    To assemble optical chips on a waveguide embedded glass panel laser structuring was done.

    Karlsruhe School of Optics & Photonics (KSOP)

    Schlossplatz 19 | 76131 Karlsruhe (Germany) | Phone: +49 (0)721 608 7880 | Fax: +49 (0)721 608 7882

  • 5

    Laser Structuring

    Aim

    Facilitate perfect alignment for the optical chips

    Reduce misalignment losses

    Reduce coupling losses by high quality

    facet

    Process:

    Green laser drilling

    CO2 laser cutting by crack propagation

    Breaking

    Karlsruhe School of Optics & Photonics (KSOP)

    Schlossplatz 19 | 76131 Karlsruhe (Germany) | Phone: +49 (0)721 608 7880 | Fax: +49 (0)721 608 7882

    Shape geometry after Green laser Drilling

    Shape geometry after CO2 laser cutting

    40mm

    5mm

    Aluminium Markers CO2 Laser cut line

  • 6

    Process Optimization

    Green Laser parameter optimization

    Parameters involved

    Laser Current

    Modulation Speed

    Speed

    CO2 Laser parameter optimization

    Parameters involved

    Laser Power

    Cut Speed

    Breaking Tool

    Karlsruhe School of Optics & Photonics (KSOP)

    Schlossplatz 19 | 76131 Karlsruhe (Germany) | Phone: +49 (0)721 608 7880 | Fax: +49 (0)721 608 7882

    (a) (b)

    Surface quality after (a) Green (b) CO2 laser parameter optimization

  • 7

    Results

    High quality optical interface

    Almost perfect positioning of the cut

    Karlsruhe School of Optics & Photonics (KSOP)

    Schlossplatz 19 | 76131 Karlsruhe (Germany) | Phone: +49 (0)721 608 7880 | Fax: +49 (0)721 608 7882

    568m

    92m

  • 8

    Summary

    Green laser and CO2 laser parameters were successfully optimized

    High quality interface and almost perfect positioning of the cut was achieved

    Some improvements in the breaking process and the breaking tool are still possible

    Karlsruhe School of Optics & Photonics (KSOP)

    Schlossplatz 19 | 76131 Karlsruhe (Germany) | Phone: +49 (0)721 608 7880 | Fax: +49 (0)721 608 7882