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Compact spot-size converters

Main Researcher: Bert Luyssaert

This research topic is about the coupling between planar waveguides having the same vertical layer structure and confinement but different horizontal widths.
This kind of coupling can occur in various situations like when vertical fiber couplers are used to couple light into a photonic integrated circuit or when multimodal straight waveguide sections are applied as low-loss connections.
Traditionally adiabatic tapers slowly convert the size of the light spot between different waveguides but tend to be very long (hundreds of microns). Instead of avoiding exciting higher-order modes, as is the basic principle of adiabatic tapers, these modes can be used in a positive way and allow new coupler concepts based on interference between the various waveguide modes.
The study of new coupler concepts has been the subject of my PhD research (thesis can be downloaded below) and has resulted in designs with relatively high coupling efficiency in the length region where adiabatic tapers no longer function well.
Experimental verification of some designs is provided as well.

Compact Spot-Size Converter versus Parabolic Taper of the same length
Compact Spot-Size Converter versus Parabolic Taper of the same length

Other people involved:

Related Research Projects

PhD thesises

Publications

    International Journals

  1. B. Luyssaert, P. Bienstman, P. Vandersteegen, P. Dumon, R. Baets, Efficient Nonadiabatic Planar Waveguide Tapers, Journal of Lightwave Technology, 23(8), p.2462-2468 doi:10.1109/jlt.2005.850795 (2005)  Download this Publication (278KB).
  2. P. Sanchis, J. Marti, W. Bogaerts, P. Dumon, D. Van Thourhout, R. Baets, Experimental results on adiabatic coupling into SOI photonic Crystal coupled-cavity waveguides, Photonics Technology Letters, 17(6), p.1199-1201 doi:10.1109/lpt.2005.846621 (2005)  Download this Publication (351KB).
  3. B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. Van Thourhout, V. Wiaux, S. Beckx, R. Baets, A Compact Horizontal Spot-Size Converter Realized in Silicon-on-Insulator, IEEE Photonics Technology Letters, 17(1), p.73-75 doi:10.1109/lpt.2004.838655 (2005)  Download this Publication (502KB).
  4. P. Sanchis, J. Garcia, J. Marti, W. Bogaerts, P. Dumon, D. Taillaert, R. Baets, V. Wiaux, J. Wouters, S. Beckx, Experimental demonstration of high coupling efficiency between wide ridge dielectric waveguides and single-mode photonic crystal waveguides , IEEE Photon. Technol. Lett., 16(10), p.2272-2274 doi:10.1109/lpt.2004.833915 (2004)  Download this Publication (409KB).
  5. W. Bogaerts, D. Taillaert, B. Luyssaert, P. Dumon, J. Van Campenhout, P. Bienstman, D. Van Thourhout, R. Baets, V. Wiaux, S. Beckx, Basic structures for photonic integrated circuits in Silicon-on-insulator, Optics Express (invited), 12(8), p.1583-1591 doi:10.1364/OPEX.12.001583 (2004)  Download this Publication (5.2MB).
      International Conferences

    1. P. Sanchis, J. Marti, W. Bogaerts, P. Dumon, R. Baets, Experimental Results and 3D Analysis of a High Efficiency Coupling Technique for Planar Photonic Crystals, European Conference on Optical Communication (ECOC) 2005, United Kingdom, p.Tu1.6.4 doi:10.1049/cp:20050433 (2005)  Download this Publication (1.2MB).
    2. P. Sanchis, P. Bienstman, R. Baets, J. Marti, Semi-analytic approach for coupling issues in photonic crystal structures, Workshop on Photonic and Electromagnetic Crystal Structures (PECS-VI), Greece, p.D.3 (2005)  Download this Publication (512KB).
    3. P. Sanchis, A. Martinez, J. Garcia, F. Cuesta-Soto, J. Marti, P. Dumon, W. Bogaerts, D. Van Thourhout, R. Baets, Experimental demonstration of adiabatic coupling into SOI photonic crystal coupled-cavity waveguides, Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference/Photonic Applications, Systems and Technologies Conference (CLEO/QELS 2005), United States, p.CTuDD2 doi:10.1109/cleo.2005.202057 (2005)  Download this Publication (304KB).
    4. B. Luyssaert, P. Vandersteegen, W. Bogaerts, P. Dumon, P. Sanchis, J. Marti, R. Baets, A Versatile Optical Spot-Size Converter Design, European Conference on Optical Communication (ECOC) 2004, We(3), Sweden, p.468-469 (2004)  Download this Publication (279KB).
    5. P. Sanchis, J. Marti, B. Luyssaert, P. Dumon, P. Bienstman, R. Baets, Analysis and design of efficient coupling into photonic crystal circuits, OWTNM04, Belgium, p.27 (2004).
    6. R. Baets, W. Bogaerts, Nanophotonic waveguides in SOI by means of deep UV lithography, Photonic and Electromagnetic Crystal Structures (PECS-V) (invited), Japan, p.160 (2004)  Download this Publication (234KB).
    7. B. Luyssaert, P. Vandersteegen, W. Bogaerts, V. Wiaux, J. Wouters, S. Beckx, R. Baets, Compact Photonic Spot-Size Converter, Photonic and Electromagnetic Crystal Structures (PECS-V), Japan, p.193 (2004).
    8. W. Bogaerts, V. Wiaux, P. Dumon, D. Taillaert, J. Wouters, S. Beckx, J. Van Campenhout, B. Luyssaert, D. Van Thourhout, R. Baets, Large-scale production techniques for photonic nanostructures, Proc. SPIE (invited), 5225, United States, p.101-112 doi:10.1117/12.503665 (2003)  Download this Publication (1.6MB).
    9. B. Luyssaert, R. Baets, 2-D simulations of various compact spot-size converters, PECS-IV, United States, p.62 (2002).
        National Conferences

      1. B. Luyssaert, P. Vandersteegen, R. Baets, Compact Photonic Spot-Size Converters, FTW PhD symposium, Belgium, p.57 (2003)  Download this Publication (664KB).

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