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Träfflista för sökning "WFRF:(Dai Daoxin) srt2:(2007)"

Sökning: WFRF:(Dai Daoxin) > (2007)

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  • Dai, Daoxin, et al. (författare)
  • Design and fabrication of ultrasmall arrayed waveguide grating multiplexers based on Si nanowire waveguides
  • 2007
  • Ingår i: Optoelectronics Letters. - : Springer Science and Business Media LLC. - 1673-1905. ; 3:1, s. 7-9
  • Tidskriftsartikel (refereegranskat)abstract
    • The large refractive index difference between Si and SiO2 makes it possible to realize ultrasmall photonic integrated circuits. A 5 × 5 ultracompact arrayed waveguide grating multiplexer based on 500×250 nm Si nanowire waveguides is designed and fabricated by using the technologies of E-beam writing and amorphous-Si deposition. The measured channel spacing is about 1.5 nm (close to the design value) and the channel crosstalk is about -8 dB.
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  • Dai, Daoxin, et al. (författare)
  • Numerical analysis of silicon-on-insulator ridge nanowires by using a full-vectorial finite-difference method mode solver
  • 2007
  • Ingår i: Journal of the Optical Society of America. B, Optical physics. - 0740-3224 .- 1520-8540. ; 24:11, s. 2853-2859
  • Tidskriftsartikel (refereegranskat)abstract
    • The characteristics of silicon-on-insulator (SOI) ridge waveguides are analyzed by using a cylindrical full-vectorial finite-difference method mode solver with a perfectly-matched layer treatment. First, the single-mode condition for an SOI ridge nanowire with different Si core thicknesses is obtained. The obtained single-mode condition is different from that for the conventional micrometrical SOI ridge waveguides with a large cross section. By adjusting the cross section (the core width and the etching depth), one can have a nonbirefringent SOI ridge nanowire. The analysis on the bending loss of S01 ridge nanowires shows that one can have a relatively small bending radius even with a shallow etching (i.e., a small ratio γ between the etching depth and the total thickness). For example, even when one chooses a small ratio γ= 0.4, one still has a low bending loss with a small bending radius of 15 μm for an SOI nanowire with a thin core h∞= 250 nm, which is very different from a conventional large SOI ridge waveguide.
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  • Dai, Daoxin, et al. (författare)
  • Three-dimensional hybrid modeling based on a beam propagation method and a diffraction formula for an AWG demultiplexer
  • 2007
  • Ingår i: Optics Communications. - : Elsevier BV. - 0030-4018 .- 1873-0310. ; 270:2, s. 195-202
  • Tidskriftsartikel (refereegranskat)abstract
    • An efficient and accurate three-dimensional (3D) hybrid modeling, which combines a 3D beam propagation method (BPM) and the two-dimensional (2D) Kirchhoff-Huygens diffraction formula, is developed to simulate the field propagation in an arrayed waveguide grating (AWG) dernultiplexer. The 2D Kirchhoff-Huygens diffraction formula is used for the simulation of the light propagation in the free propagation regions (FPRs). A 3D BPM in a polar coordinate system is used to simulate the light propagation in the transition region between the input FPR and the arrayed waveguides so that the coupling coefficients for the arrayed waveguides are calculated conveniently and accurately. For the simulation in the transition region between the arrayed waveguides and the output FPR, only the central arrayed waveguide and several adjacent ones are needed in the computational window of a standard BPM and thus the computation efficiency is improved. Finally, a flat-top AWG is designed and fabricated to verify the reliability of the present simulation method. The calculated and measured spectral responses are in a good agreement.
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  • Shi, Yaocheng, et al. (författare)
  • Design of a compact multimode interference coupler based on deeply-etched SiO2 ridge waveguides
  • 2007
  • Ingår i: Optics Communications. - : Elsevier BV. - 0030-4018 .- 1873-0310. ; 271:2, s. 404-407
  • Tidskriftsartikel (refereegranskat)abstract
    • A compact multimode interference (MMI) coupler is realized by using deeply-etched SiO2 ridge waveguides, which have a strong confinement in the lateral direction and improve the quality of self-images in the MMI section, A 1 x 4 MMI coupler is designed as a numerical example and demonstrates good performances such as a low insertion (0.0275 dB) and small non-uniformity (0.0507 dB). The total device size of the present MMI coupler is reduced to about 1/16 of that based on SiO2 buried waveguides.
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  • Shi, Yaocheng, et al. (författare)
  • Proposal for an ultracompact polarization-beam splitter based on a photonic-crystal-assisted multimode interference coupler
  • 2007
  • Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 19:9-12, s. 825-827
  • Tidskriftsartikel (refereegranskat)abstract
    • An ultracompact polarization-beam splitter (PBS) combining a multimode interference (MMI) coupler and some photonic crystal (PC) structures is presented. The MMI coupler is designed to collect polarized powers reflected by or transmitted through an internal PC sturcture. The simulation result shows that the designed PBS is very short (about 50 mu m), and has a low insertion loss, a high extinction ratio, and a broad bandwidth.
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  • Wang, Zhechao, et al. (författare)
  • Polarization-insensitive ultrasmall microring resonator design based on optimized Si sandwich nanowires
  • 2007
  • Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 19:17-20, s. 1580-1582
  • Tidskriftsartikel (refereegranskat)abstract
    • Bent Si sandwich nanowires are used and optimized to obtain an ultrasmall polarization-insensitive microring resonator (MRR). The used Si sandwich nanowire has a low refractive index layer between two Si layers with high refractive indexes. By optimizing the refractive index and thickness of the sandwiched layer, the bent Si sandwich nanowire becomes nonbirefringent theoretically. The designed nonbirefringent nanowire has a relatively good fabrication tolerance. By using such a nonbirefringent bent Si sandwich nanowire, an ultrasmall polarization-insensitive MRR is designed.
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  • Resultat 1-10 av 12
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tidskriftsartikel (10)
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refereegranskat (12)
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Dai, Daoxin (12)
He, Sailing (8)
Liu, Liu (3)
Shi, Yaocheng (3)
Sheng, Zhen (2)
Dainese, Matteo (1)
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Wosinski, Lech (1)
Hu, Rui (1)
Zhen, Sheng (1)
Wang, Zhechao (1)
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