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Couplers are important parts in integrated optical circuit and high efficiency compact couplers are in great demand. We report on high-efficiency silicon-on-sapphire (SOS) grating couplers at wavelength of 2.7µm. A 75% coupling efficiency and 50nm etching depth bandwidth (the tolerance of etching height) from a standard single-mode fiber to an SOS waveguide is obtained. A basic design principle of...
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