Bend Coupling Through Near-Zero GVD Slow Light Photonic Crystal Waveguides
Slow light propagation through photonic crystal (PhC) slab devices has great potential to reduce the size and power consumption of silicon photonic optical circuits. Most commonly, slow light routing through photonic crystals is achieved by using W1 waveguide bends operating near their cutoff freque...
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IEEE
2018-01-01
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| author | Emerson Goncalves Melo Daniel Orquiza de Carvalho Marco Isaias Alayo |
| author_facet | Emerson Goncalves Melo Daniel Orquiza de Carvalho Marco Isaias Alayo |
| author_sort | Emerson Goncalves Melo |
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| description | Slow light propagation through photonic crystal (PhC) slab devices has great potential to reduce the size and power consumption of silicon photonic optical circuits. Most commonly, slow light routing through photonic crystals is achieved by using W1 waveguide bends operating near their cutoff frequencies. Unfortunately, this leads to optical pulse distortion due the high group velocity dispersion (GVD) associated with these designs. In this letter, however, we study the coupling between slow light waveguides optimized for near-zero GVD and 60<inline-formula> <tex-math notation="LaTeX">$^{\circ }$</tex-math></inline-formula> PhC bends. Using numerical methods and the temporal coupled mode theory, we assess the performance of single bends coupled to input/output waveguides, and S-bends composed of two cascaded bends. In this latter, we observe that the bend-waveguide quality factor has great impact over transmission and dispersion. We propose a novel 60<inline-formula><tex-math notation="LaTeX">$^{\circ }$ </tex-math></inline-formula> PhC bend design for routing optical modes while maintained reduced dispersion. This is achieved over a -3 dB bandwidth of around 50 nm in devices with slowdown factor up to 40. We show that this 60 <inline-formula><tex-math notation="LaTeX">$^{\circ }$</tex-math></inline-formula> PhC bend has good stability under changes in S-bend length and fabrication induced disorder. These results can lead to great improvements in the design of monolithically integrated modulators, switches, (de)multiplexers, and filters based on photonic crystals, as well as on the routing of long optical buffers and delay lines. |
| format | Article |
| id | doaj-art-c8932a8dac5e4a46906e6d61e1ee11e9 |
| institution | DOAJ |
| issn | 1943-0655 |
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| publishDate | 2018-01-01 |
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| series | IEEE Photonics Journal |
| spelling | doaj-art-c8932a8dac5e4a46906e6d61e1ee11e92025-08-20T03:15:15ZengIEEEIEEE Photonics Journal1943-06552018-01-0110511210.1109/JPHOT.2018.28684818454451Bend Coupling Through Near-Zero GVD Slow Light Photonic Crystal WaveguidesEmerson Goncalves Melo0https://orcid.org/0000-0002-7026-5747Daniel Orquiza de Carvalho1https://orcid.org/0000-0002-0518-2021Marco Isaias Alayo2Department of Electronic Systems Engineering, University of São Paulo, São Paulo, SP, BrazilUNESP - São Paulo State University, São João da Boa Vista, SP, BrazilDepartment of Electronic Systems Engineering, University of São Paulo, São Paulo, SP, BrazilSlow light propagation through photonic crystal (PhC) slab devices has great potential to reduce the size and power consumption of silicon photonic optical circuits. Most commonly, slow light routing through photonic crystals is achieved by using W1 waveguide bends operating near their cutoff frequencies. Unfortunately, this leads to optical pulse distortion due the high group velocity dispersion (GVD) associated with these designs. In this letter, however, we study the coupling between slow light waveguides optimized for near-zero GVD and 60<inline-formula> <tex-math notation="LaTeX">$^{\circ }$</tex-math></inline-formula> PhC bends. Using numerical methods and the temporal coupled mode theory, we assess the performance of single bends coupled to input/output waveguides, and S-bends composed of two cascaded bends. In this latter, we observe that the bend-waveguide quality factor has great impact over transmission and dispersion. We propose a novel 60<inline-formula><tex-math notation="LaTeX">$^{\circ }$ </tex-math></inline-formula> PhC bend design for routing optical modes while maintained reduced dispersion. This is achieved over a -3 dB bandwidth of around 50 nm in devices with slowdown factor up to 40. We show that this 60 <inline-formula><tex-math notation="LaTeX">$^{\circ }$</tex-math></inline-formula> PhC bend has good stability under changes in S-bend length and fabrication induced disorder. These results can lead to great improvements in the design of monolithically integrated modulators, switches, (de)multiplexers, and filters based on photonic crystals, as well as on the routing of long optical buffers and delay lines.https://ieeexplore.ieee.org/document/8454451/Photonic crystalwaveguide benddispersion engineeringslow light |
| spellingShingle | Emerson Goncalves Melo Daniel Orquiza de Carvalho Marco Isaias Alayo Bend Coupling Through Near-Zero GVD Slow Light Photonic Crystal Waveguides IEEE Photonics Journal Photonic crystal waveguide bend dispersion engineering slow light |
| title | Bend Coupling Through Near-Zero GVD Slow Light Photonic Crystal Waveguides |
| title_full | Bend Coupling Through Near-Zero GVD Slow Light Photonic Crystal Waveguides |
| title_fullStr | Bend Coupling Through Near-Zero GVD Slow Light Photonic Crystal Waveguides |
| title_full_unstemmed | Bend Coupling Through Near-Zero GVD Slow Light Photonic Crystal Waveguides |
| title_short | Bend Coupling Through Near-Zero GVD Slow Light Photonic Crystal Waveguides |
| title_sort | bend coupling through near zero gvd slow light photonic crystal waveguides |
| topic | Photonic crystal waveguide bend dispersion engineering slow light |
| url | https://ieeexplore.ieee.org/document/8454451/ |
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