Compact 1 × N thermo-optic switches based on silicon photonic wire waveguides

The University of Tokyo, Tōkyō, Japan
Optics Express (Impact Factor: 3.49). 12/2005; 13(25):10109-10114. DOI: 10.1364/OPEX.13.010109


Using silicon photonic wire waveguides, we constructed compact 1 × 1, 1 × 2, and 1 × 4 Mach-Zehnder interferometer type optical switches on a silicon-on-insulator substrate and demonstrated their switching operations through the thermo-optic effect. These switches were smaller than 140 × 65, 85 × 30, and 190 × 75 μm, respectively. At a 1550-nm wavelength, we obtained an extinction ratio larger than 30 dB, a switching power as low as 90 mW, and a switching response time of less than 100 μs. Furthermore, switching operations were successfully demonstrated for the 1 × 4 switch.

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    • "Consequently, nonlinear optical effects, including stimulated Raman scattering (SRS), stimulated Brillouin scattering (SBS), self-phase modulation (SPM), cross-phase modulation (XPM), two-photon absorption (TPA), and four-wave mixing (FWM), occur employing low input power equivalent to that typical in optical communications [4] [5]. Adopting Si-wire waveguides different devices have been realized as reconfigurable optical add-drop multiplexers (ROADM) [6], micro-ring resonators [7], arrayed waveguide gratings (AWG) [8], thermo-optic switches [9], polarization splitter [10], Raman optical amplifiers [5] and wavelength converters [11]. "
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    • "Microscopic views of the switches are shown in Fig. 14(a) and (b), respectively. The 1 × 1 and 1 × 2 switches were composed of a Y-splitter for dividing the input light beam, a thermooptically controlled MZI for tuning the phase of the propagating light beam, and a 3-dB coupler with a Y-splitter for the 1 × 1 switch or with a DC for the 1 × 2 switch [27]. All of them were based on Si photonic wire waveguides on an SOI substrate . "
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