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Träfflista för sökning "WFRF:(Dai Daoxin) srt2:(2004)"

Sökning: WFRF:(Dai Daoxin) > (2004)

  • Resultat 1-4 av 4
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1.
  • Dai, Daoxin, et al. (författare)
  • Accurate two-dimensional model of an arrayed-waveguide grating demultiplexer and optimal design based on the reciprocity theory
  • 2004
  • Ingår i: Journal of the Optical Society of America A: Optics and Image Science, and Vision. - 1084-7529. ; 21:12, s. 2392-2398
  • Tidskriftsartikel (refereegranskat)abstract
    • An accurate two-dimensional (2D) model is introduced for the simulation of an arrayed-waveguide grating (AWG) demultiplexer by integrating the field distribution along the vertical direction. The equivalent 2D model has almost the same accuracy as the original three-dimensional model and is more accurate for the AWG considered here than the conventional 2D model based on the effective-index method. To further improve the computational efficiency, the reciprocity theory is applied to the optimal design of a flat-top AWG demultiplexer with a special input structure.
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2.
  • Dai, Daoxin, et al. (författare)
  • Analysis of characteristics of bent rib waveguides
  • 2004
  • Ingår i: Journal of the Optical Society of America A. - 0740-3232. ; 21:1, s. 113-121
  • Tidskriftsartikel (refereegranskat)abstract
    • With a perfectly matched layer boundary treatment, a semivectorial finite-difference method is used to calculate the eigenmodes of a single-mode (SM) or multimode (MM) bent rib waveguide. A detailed analysis is given for the dependence of the bending losses (including the pure bending loss and the transition loss) on geometrical parameters of the bent rib waveguide such as the rib width, the rib height, and the bending radius. The characteristics of the higher-order modes are analyzed. It is shown that the bending loss of the fundamental mode can be reduced effectively by increasing the width and height of the rib. For an integrated device, undesired effects due to the higher-order modes of a MM bent waveguide can be removed by appropriate choice of the geometrical parameters. An appropriately designed MM bent waveguide is used to reduce effectively the bending loss of the fundamental mode, and a low-loss SM propagation in a MM bent waveguide is realized when the bending losses of the higher-order modes are large enough.
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3.
  • Dai, Daoxin, et al. (författare)
  • Analysis of the birefringence of a silicon-on-insulator rib waveguide
  • 2004
  • Ingår i: Applied Optics. - 1559-128X .- 2155-3165. ; 43:5, s. 1156-1161
  • Tidskriftsartikel (refereegranskat)abstract
    • A detailed analysis of the polarization characteristics (birefringence) of a silicon-on-insulator (SOI) rib waveguide is given. The fundamental TE- and TM-polarized modes of the SOI rib waveguide are calculated by a semivectorial finite-difference method. The rib width and the slab height of the SOI rib waveguide are normalized with respect to the total height of the silicon layer. A general relation between the two normalized parameters for a nonbirefringent SOI rib waveguide is obtained. According to this relation a nonbirefringent SOI rib waveguide can easily be designed. The fabrication tolerance for a nonbirefringent SOI rib waveguide is also analyzed, revealing that the tolerance can be increased by use of a larger total height of the silicon layer.
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4.
  • Dai, Daoxin, et al. (författare)
  • Calculation of the spectral response of an arrayed-waveguide gating demultiplexer with a wide-angle beam propagation method in a cylindrical coordinate system
  • 2004
  • Ingår i: Optical and quantum electronics. - : Springer Science and Business Media LLC. - 0306-8919 .- 1572-817X. ; 36:11, s. 967-979
  • Tidskriftsartikel (refereegranskat)abstract
    • The spectral response of an arrayed-waveguide grating (AWG) demultiplexer is calculated by simulating the field propagation in the output section of an AWG with a wide-angle beam propagation method (BPM) in a cylindrical coordinate system. As in a practical design of an AWG demultiplexer, each output waveguide consists of two straight sections connected by a bending section. The spectral response obtained by the present algorithm is more accurate than those obtained with two popular approximate methods, namely, the conventional overlapped integral method and the standard BPM for radially straight and infinitely long output waveguides. With the present algorithm, the dependence of the spectral response on the parameters of the output section is analyzed. The channel crosstalk and the 3 dB passband width of the spectral response depend mainly on the length of the first straight section, the end separation and the angular separation of the output waveguides. The bending section results in an asymmetrical spectral response with remarkable sidelobes which can be reduced by increasing the bending radius.
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  • Resultat 1-4 av 4
Typ av publikation
tidskriftsartikel (4)
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refereegranskat (4)
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Dai, Daoxin (4)
He, Sailing (3)
He, S L (1)
Lärosäte
Kungliga Tekniska Högskolan (4)
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Engelska (4)
Forskningsämne (UKÄ/SCB)
Teknik (3)
Naturvetenskap (1)
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