Micro-Branch in Silicon Photonic Wire Waveguides

Sakai, Atsushi; Fukazawa, Tatsuhiko; Baba, Toshihiko

doi:10.1364/ipr.2002.ithi12

Cited by 17 publications

(16 citation statements)

References 6 publications

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“…Submicrometer-size photonic wire waveguides [17] based on SOI structure should be able to provide large enough amplification factor once free-carrier absorption is suppressed.…”

Section: Discussionmentioning

confidence: 99%

Nonlinear Absorption and Raman Scattering in Silicon-on-Insulator Optical Waveguides

Liang

Tsang

2004

IEEE J. Select. Topics Quantum Electron.

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We study the nonlinearities in silicon-on-insulator (SOI) optical waveguides, which include two-photon absorption (TPA), free-carrier absorption, and spontaneous and stimulated Raman scattering (SRS). We show experimentally that free carriers generated by TPA in the SOI waveguides produce large optical loss at room temperature. The experimental results confirmed the presence of relative optical signal amplification from SRS, but it was found that net gain was hardly achieved because the stimulated Raman gain was less than the induced loss from TPA-generated free carriers at room temperature with continuous-wave pumping source in a SOI rib waveguide. We also experimentally investigated the temperature dependence of Raman scattering in the SOI waveguide and observed the Raman gain to be greater than TPA-generated free-carrier absorption loss at 77 K.

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“…Submicrometer-size photonic wire waveguides [17] based on SOI structure should be able to provide large enough amplification factor once free-carrier absorption is suppressed.…”

Section: Discussionmentioning

confidence: 99%

Nonlinear Absorption and Raman Scattering in Silicon-on-Insulator Optical Waveguides

Liang

Tsang

2004

IEEE J. Select. Topics Quantum Electron.

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“…14,18) In this study, we employed a parabolic taper and optimized the structure by 3D FDTD method. To obtain better convergence of calculation, we reduced the Yee cell size to (20 nm) 3 . To save the computation time, we used a simplified rectangular model, as shown in the inset of Fig.…”

Section: Reduction In Scattering Lossmentioning

confidence: 99%

Sidelobe reduction in Si photonic wire AWG

et al. 2006

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We designed and fabricated an arrayed waveguide grating demultiplexer of 70 × 75 m 2 size, which consists of Si slab and wire waveguides on silicon-on-insulator substrate. By optimizing the connection between components and the layout of arrayed waveguides, the internal light scattering and the phase error were suppressed. As a result, the clear demultiplexing characteristics were observed with a channel spacing of 8 nm and a sidelobe level of 22 dB in the wavelength range around 1.55 m.

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“…First, we present the 1P MZI consisting of a couple of µ-branches. As the µ-branch, we employed the bend-waveguide-type branch [4], in which the ends of two bend wave- guides are touched with each other and connected to the input waveguide. By optimizing the touching length, a stable branch ratio of 1:1 is maintained even if the structural asymmetry is induced during the fabrication process.…”

Section: Mach-zehnder Interferometer (Mzi)mentioning

confidence: 99%

“…Thus far, low loss light propagation by the reduction of the process roughness [1], a low group velocity based on the strong structural dispersion [2], low loss compact bends [2,3], branches [4] and intersections [5], a high efficiency spot size converter for the coupling to optical fibers [6], an H-tree optical signal distribution circuit [7], a Bragg resonant filter [8], a µ-ring filter [9], a lattice filter [10] and an arrayed waveguide grating filter [11] have been reported. Previously, we have reviewed these results in SPIE proceedings [12,13].…”

Section: Introductionmentioning

confidence: 99%

Si photonic wire waveguides

Baba

2004

SPIE Proceedings

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Due to their ultrahigh index contrast structure, Si photonic wire waveguides realize various µ-components, which enable us to design and fabricate compact photonic devices and circuits. We have already demonstrated them theoretically and experimentally in some journal papers and two SPIE proceedings. In this work, I pick up other two topics; one is the polarization crosstalk, and the other is a Mach-Zehnder interferometer. The former will be a significant problem that degrades the performance of functional circuits based on polarization-dependent devices. It was experimentally measured, and its reduction method was theoretically investigated by the three-dimensional finite-difference time domain method. The latter device is a basic element of functional circuits. By employing µ-bends and µ-couplers, a high extinction ratio of over 15 dB and a large diffraction order of 300 were achieved within a small foot space of 20 × 20 µm 2 .

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Micro-Branch in Silicon Photonic Wire Waveguides

Cited by 17 publications

References 6 publications

Nonlinear Absorption and Raman Scattering in Silicon-on-Insulator Optical Waveguides

Nonlinear Absorption and Raman Scattering in Silicon-on-Insulator Optical Waveguides

Sidelobe reduction in Si photonic wire AWG

Si photonic wire waveguides

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