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Träfflista för sökning "WFRF:(Dai Daoxin) "

Sökning: WFRF:(Dai Daoxin)

  • Resultat 1-10 av 68
  • [1]234567Nästa
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1.
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2.
  • Dai, Daoxin, et al. (författare)
  • A silicon-based hybrid plasmonic waveguide with a metal cap for a nano-scale light confinement
  • 2009
  • Ingår i: Optics Express. - 1094-4087. ; 17:19, s. 16646-16653
  • Tidskriftsartikel (refereegranskat)abstract
    • A hybrid plasmonic waveguide with a metal cap on a silicon-on-insulator rib (or slab) is presented. There is a low-index material nano-layer between the Si layer and the metal layer. The field enhancement in the nano-layer provides a nano-scale confinement of the optical field (e. g., 50nm x 5nm) when operates at the optical wavelength lambda = 1550nm. The theoretical investigation also shows that the present hybrid plasmonic waveguide has a low loss and consequently a relatively long propagation distance (on the order of several tens of lambda).
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3.
  • 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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4.
  • 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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5.
  • Dai, Daoxin, et al. (författare)
  • Analysis of the birefringence of a silicon-on-insulator rib waveguide
  • 2004
  • Ingår i: Applied Optics. - 0003-6935. ; 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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6.
  • 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. - 0306-8919. ; 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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7.
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8.
  • Dai, Daoxin, et al. (författare)
  • Compact Microracetrack Resonator Devices Based on Small SU-8 Polymer Strip Waveguides
  • 2009
  • Ingår i: IEEE Photonics Technology Letters. - 1041-1135. ; 21:1-4, s. 254-256
  • Tidskriftsartikel (refereegranskat)abstract
    • Compact microracetrack resonator (MRR) devices are presented with small SU-8 polymer strip waveguides. The SU-8 strip waveguide has an SU-8 polymer core (n similar to 1.573), a SiO2 buffer (n similar to 1.445), and an air cladding. The fabricate straight waveguide has a low propagation loss of about 0.1. dB/mm. With such a high index-contrast optical waveguide, a compact MRR with a small bending radius (similar to 150 mu m) are designed and fabricated. The measured spectral responses of the through/drop ports show a Q-factor of 8000.
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9.
  • Dai, Daoxin, et al. (författare)
  • Compact Microring Resonator With 2 x 2 Tapered Multimode Interference Couplers
  • 2009
  • Ingår i: Journal of Lightwave Technology. - 0733-8724. ; 27:21, s. 4878-4883
  • Tidskriftsartikel (refereegranskat)abstract
    • Compact microring resonator devices are realized by using a small SU-8 polymer strip waveguide that has an SU-8 polymer core (n similar to 1.573), an SiO2 buffer (n similar to 1.445), and an air cladding. Due to the high index contrast of the optical waveguide, a small bending radius (similar to 150 mu m) is used for the MRR. To enhance the coupling between the access optical waveguides and the microring, 2 x 2 multimode interference couplers are used. The measured spectral response of the through port shows a high extinction ratio of over 15 dB and a 3-dB bandwidth of about 0.38 nm (corresponding to a moderate Q-value of similar to 4500).
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10.
  • Dai, Daoxin, et al. (författare)
  • Compact silicon-on-insulator-based multimode interference coupler with bilevel taper structures
  • 2005
  • Ingår i: Applied Optics. - 0003-6935. ; 44:24, s. 5036-5041
  • Tidskriftsartikel (refereegranskat)abstract
    • A novel compact silicon-on-insulator- (SOI-)based multimode interference (MMI) coupler with bilevel taper structures was designed. The MMI section and the S-bend sections of the input-output waveguides are deeply etched. The input-output waveguides connecting to single-mode fibers or other photonic light circuits are etched shallowly to yield single-mode operation. A bilevel taper is introduced in the transition region between the shallowly and deeply etched regions. It is predicted theoretically that this design will not only improve the quality of the self-imaging in the MMI section but will also make the structure compact. Both the excess loss and the nonuniformity of the MMI coupler are reduced. By use of a three-dimensional beam propagation method, the performance of a 1 × 4 MMI coupler based on a SOI is simulated as a numerical example of the novel design. The simulated nonuniformity and the excess loss are approximately 0.0285 and 0.2 dB, respectively.
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  • Resultat 1-10 av 68
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