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We report an enhancement of coupling efficiency between an optical fiber and graphene photonic device integrated on a silicon photonics platform. The design and optimization of selective spot-size converters (SSSCs) enables low coupling losses of 1.4 dB/facet for TE and 2.4 dB/facet for TM modes without causing damage to the graphene. In order to maximize the potential of the perfect wavelength independent...
A drastic Q factor variation from 7900 to 1200 is observed in a silicon ring resonator loaded by micrometer-scale graphene with various lengths. The significant decay of the Q factor agrees with a numerical analysis.
We characterized optical absorption of single-layer graphene, which was integrated on a sub-micron scale silicon waveguide. The result revealed that the absorption in TM mode is lower than that in TE mode by surface-plasmon polariton.
A novel waveguide structure in Mg:LN membrane was developed on Si platform by wet and dry etching processes. Periodically poled structure in the membrane achieved QPM SHG at telecommunication band.
Cladless nonlinear optical waveguide is fascinating for high-sensitivity light-fluid interaction. Membrane composed of 4µm-thick Mg:LN is fabricated by an etching process on a silicon platform. Novel fabrication process will be introduced for various sensing applications.
We experimentally demonstrate parametric tunable dispersion compensation with a spectrally non-inverting tunable wavelength converter based on cascaded sum- and difference-frequency generation of PPLN waveguide. An error-free 43-Gbit/s NRZ-OOK transmission over 53.2-km SMF is successfully achieved with a low-power penalty.
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