In this paper,we introduce a horizontal slot in the reversed-rib chalcogenide glass waveguide to tailor its dispersion characteristics.The waveguide exhibits a flat and low dispersion over a wavelength range of 1080 n...In this paper,we introduce a horizontal slot in the reversed-rib chalcogenide glass waveguide to tailor its dispersion characteristics.The waveguide exhibits a flat and low dispersion over a wavelength range of 1080 nm,in which the dispersion fluctuates between-10.6 ps·nm-1·km-1 and ＋11.14 ps·nm-1·km-1.The dispersion tailoring effect is due to the mode field transfer from the reversed-rib waveguide to the slot with the increase of wavelength,which results in the extension of the low dispersion band.Moreover,the nonlinear coefficient and the phase-matching condition of the fourwave mixing process in this waveguide are studied,showing that the waveguide has great potential in nonlinear optical applications over a wide wavelength range.展开更多
Developing natural “free space” frequency upconversion is essential for photonic integrated circuits. In a singlecrystal lithium niobate thin film planar waveguide of less than 1 μm thickness, we achieve type I and...Developing natural “free space” frequency upconversion is essential for photonic integrated circuits. In a singlecrystal lithium niobate thin film planar waveguide of less than 1 μm thickness, we achieve type I and type II mode phase-matching conditions simultaneously for this thin film planar waveguide. Finally, by employing the mode phase matching of e t e → e with d_（33） at 1018 nm, we successfully achieve a green second-harmonic wave output with the conversion efficiency of 0.12%∕（W·cm^2）, which verifies one of our simulation results. The rich mode phase matching for three-wave mixing in a thin film planar waveguide may provide a potential application in on-chip frequency upconversions for integrated photonic and quantum devices.展开更多
To extensively deploy quantum key distribution（QKD） systems, copropagating with classical channels on the same fiber using wavelength division multiplexing（WDM） technology becomes a critical issue. We propose a us...To extensively deploy quantum key distribution（QKD） systems, copropagating with classical channels on the same fiber using wavelength division multiplexing（WDM） technology becomes a critical issue. We propose a user-based channel-interleaving WDM scheme with unequal frequency spacing（UFS-i WDM） to reduce the impairment on the quantum channels induced by four-wave mixing（FWM）, and theoretically analyze its impact on quantum bit error rate（QBER）. Numerical simulation results show that a UFS-i WDM can significantly reduce the FWM noise and improve QBER compared with the corresponding WDM scheme with equal frequency spacing（EFS）, especially in the case of nonzero dispersion shifted fiber.展开更多
基金Project supported by the National Basic Research Program of China(Grant Nos.2013CB328700 and 2011CBA00303)the National Natural Science Foundation of China(Grant Nos.61575102 and 61321004)
文摘In this paper,we introduce a horizontal slot in the reversed-rib chalcogenide glass waveguide to tailor its dispersion characteristics.The waveguide exhibits a flat and low dispersion over a wavelength range of 1080 nm,in which the dispersion fluctuates between-10.6 ps·nm-1·km-1 and ＋11.14 ps·nm-1·km-1.The dispersion tailoring effect is due to the mode field transfer from the reversed-rib waveguide to the slot with the increase of wavelength,which results in the extension of the low dispersion band.Moreover,the nonlinear coefficient and the phase-matching condition of the fourwave mixing process in this waveguide are studied,showing that the waveguide has great potential in nonlinear optical applications over a wide wavelength range.
基金supported by the National Natural Science Foundation of China under Grant Nos.11574208 and61235009
文摘Developing natural “free space” frequency upconversion is essential for photonic integrated circuits. In a singlecrystal lithium niobate thin film planar waveguide of less than 1 μm thickness, we achieve type I and type II mode phase-matching conditions simultaneously for this thin film planar waveguide. Finally, by employing the mode phase matching of e t e → e with d_（33） at 1018 nm, we successfully achieve a green second-harmonic wave output with the conversion efficiency of 0.12%∕（W·cm^2）, which verifies one of our simulation results. The rich mode phase matching for three-wave mixing in a thin film planar waveguide may provide a potential application in on-chip frequency upconversions for integrated photonic and quantum devices.
基金supported by the National Natural Science Foundation of China under Grant No.61331008
文摘To extensively deploy quantum key distribution（QKD） systems, copropagating with classical channels on the same fiber using wavelength division multiplexing（WDM） technology becomes a critical issue. We propose a user-based channel-interleaving WDM scheme with unequal frequency spacing（UFS-i WDM） to reduce the impairment on the quantum channels induced by four-wave mixing（FWM）, and theoretically analyze its impact on quantum bit error rate（QBER）. Numerical simulation results show that a UFS-i WDM can significantly reduce the FWM noise and improve QBER compared with the corresponding WDM scheme with equal frequency spacing（EFS）, especially in the case of nonzero dispersion shifted fiber.
