Narrow line-width 1.3-μm wavelength tunable InAs/InGaAs quantum dot based bench-top light source using sandwiched sub-nano separator growth technique
Using sandwiched sub-nano separator technique, we successfully developed a narrow linewidth broadband 1.3-μm wavelength tunable quantum dot based bench-top light source, which can be useful for coherent photonic transport in O-band.
Broadband light source using modulated quantum dot structures with sandwiched sub‐nano separator (SSNS) technique
A broadband light source for a wavelength range of around 1.2-1.3 μm can be fabricated using a multi-stacked and modulated InAs/InGaAs quantum dot (QD) structure with the sandwich sub-nano separator (SSNS) technique. These techniques, such as use of the modulated QD structure and SSNS structure, are considered useful in obtaining a high-quality and ultra-broadband QD optical gain material for the laser and/or optical amplifier. A broadband (>75 nm bandwidth) and bright (few tenths of a mW) light emission in its waveband is successfully demonstrated from a QD laser diode using a modulated QD optical gain with the SSNS technique. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Centrifuge modelling of effects of shield tunnels on existing tunnels in soft clay
With the rapid development of the subway network,the phenomena of shield tunnels going across the adjacent tunnels are becoming more and more common.The interaction between shield tunneling and nearby tunnels is more complicated than the ordinary shield tunneling in intact soil strata.Based on the project of Shanghai Bund Passage crossing Metro Line 2,the method of centrifuge modeling together with the field measurement is employed to study the effects shield tunneling on nearby strata and existing tunnels.In centrifugal model tests,the effects simulation techniques considering the unloading of excavation,ground loss and grouting are developed to analyze the longitudinal settlement of the shield tunnel and the existing tunnel induced by the shield tunneling.Besides,the deformation distribution and settlement curves of the existing tunnels during shield construction are studied by using the monitoring data.