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We present our recent work on fibre-chip grating couplers operating around 1310 nm. For the first time, we demonstrated the combination of dual-etch and apodization design approaches which can offer state of the art performance. Initial tests from fabricated structures show a −2.2dB loss.
In this work, a new approach is developed for predicting the vibro-acoustic characteristics of a semi-submerged cylindrical shell on the basis of the Flügge shell theory and sound-structure coupling theory. The effect of fluid free surface is taken into account by satisfying the sound pressure release boundary condition. The wave propagation method is utilized to derive the sound-structure coupling...
A compact 3 dB 90º directional coupler is fabricated by integrated passive device (IPD) process on SI-GaAs substrate for long term evolution (LTE) application. The operating frequency is between 800 MHz to 915 MHz, which is the LTE application frequency band 5 and band 8. At the center frequency of 875 MHz, the proposed coupler achieved −0.8 dB of insertion loss and −3.5 dB of coupling. The reflection...
We describe a scalable optomechanical array, with double-disk resonators, for two-qubit quantum phase gate of phonon states where mechanical systems exhibit significantly long lifetime. Simulation results show high fidelity and low photon loss.
We demonstrate a strong optomechanical coupling air-slot mode-gap photonic crystal cavity with dispersive coupling gom up to 940 GHz/nm. Optical and mechanical measurements are shown. Radio frequency spectrum is obtained theoretically and experimentally with a megahertz resonant frequency.
This paper formulates generalized transformer efficiency associated with the applications of Above-IC multifilar transformers to multiport integrated passive devices (IPDs). The formulation derives the power loss ratio for a multifilar transformer in multiport configuration based on a terminated microwave network and then leads to the expression of passive efficiency using the concept of power conservation...
We demonstrated a strong optomechanical coupling in a high-quality factor (Q) air-slot mode-gap photonic crystal cavity with ultrasmall mode volume, with a coupling length L∼2.9µm. Optomechanical coupling lengths with different slot gaps and lengths were also compared.
A diffractive grating in silicon was demonstrated for near vertical off-chip coupling between Silicon-on-insulator (SOI) photonic nanowire and optical fiber. By simulation, the coupling efficiency of 46% from nanowire to fiber was predicted. Finally, the grating coupler with the efficiency of 25% and 3-dB bandwidth of 45 nm was obtained.
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