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For telecommunications applications of highly-integrated silicon-based photonic devices, we have developed a silicon-germanium-silica monolithic photonic integration platform, on which high-performance silica-based passive devices and compact, high-speed silicon-based dynamic/active devices can be monolithically integrated.
We present a polarization-entanglement source integrated on a chip. The device consists of two nonlinear silicon wire waveguides connected by a silicon-wire polarization rotator. A maximally entangled state was obtained with a fidelity of 91%.
For telecommunications applications of highly-integrated silicon-based photonic devices, we have developed a silicon-silica monolithic photonic platform, in which highperformance silica-based passive devices and compact, high-speed silicon-based dynamic/active devices can be monolithically integrated.
Various photonic devices covering passive to active functions have been developed and monolithically-integrated on a silicon wire waveguide platform. Obstacles to practical applications are being eliminated by applying state-of-art fabrication technologies and unique device designs.
We report the frequency and polarization characteristics of correlated photon pairs generated in a Si wire waveguide (SWW). We confirmed that the bandwidth for correlated photon-pair generation was at least >2.8 THz. Moreover, we carried out a classical four-wave mixing experiment using strong pump and idler lights to estimate the bandwidth for correlated photon-pair generation. The results indicated...
Silicon photonics technologies are potentially useful in quantum information and communication experiments. This talk describes the first entangled photon-pair generation experiment to use a silicon wire waveguide, and discusses the application of silicon-based entanglement sources in quantum communication systems.
We reported the first entanglement generation experiments using a silicon wire waveguide. In our experiments, we used a 1.09-cm long, 460-nm wide, and 220-nm thick waveguide that was fabricated from a silicon-on-insulator wafer. The waveguide loss was 3.1 dB, and the effective area calculated using a mode solver was 0.04 mum2 . We hope that our work will constitute a bridge between the silicon photonics...
We report the fabrication of spot-size converters to efficiently connect a rib-type silicon wire waveguide with an optical fiber. The spot-size converter consists of a channel-type Si inverse taper core without a slab section and a SiOx waveguide that covers the taper. To make the Si taper core, we eliminate the Si slab at the end of the rib waveguide using a two-step etching process. The coupling...
We present the first experimental generation of 1.5-mum band polarization entanglement based on spontaneous four-wave mixing in a silicon wire waveguide. Two-photon interference fringes with >83% visibilities were successfully obtained.
A compact polarization splitter and rotator based on silicon photonic wire waveguide have been developed. The splitter is based on simple directional couplers. In the fabricated splitter, the polarization extinction ratio is 23 dB and excess loss is less than 0.5 dB. The rotator consists of a silicon waveguide and an off-axis silicon oxinitride waveguide. In the fabricated rotator, efficient polarization...
A low-loss silicon photonic wire waveguide with low-impedance p-i-n carrier injection structures was developed. The propagation loss of the waveguide was less than 2 dB/cm and the input-impedance was adjustable around a few ten ohms. In a compact variable optical attenuator using this waveguide, the power consumption giving 30-dB attenuation was about 55 mW, and the response time was about 2 ns. A...
We propose a novel polarization beam splitter (PBS) and rotator (PBR) for polarization diversity configuration to implement a polarization-independent silicon photonic circuit. Our PBS, which is based on a directional coupler (DC), exhibits the polarization extinction ratio (PER) of 10 dB for the C-band, and the maximum PER is 23 dB. For the PBR, which consists of a Si wire and an off-axis silicon...
In silicon photonic wire waveguides, the four-wave mixing effect provides efficient wavelength conversion, with internal conversion efficiency of about -11 dB. The two-photon absorption effect in the waveguides also provides efficient and wideband all-optical amplitude modulation
We report our recent progress on Si-wire-based optical devices. We made some functional devices that integrate several fundamental components and confirmed that they exhibited excellent characteristics due to the accuracy of Si microfabrication.
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