4篇
您的检索式：作者名="HE GangQiang"
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| 1 | Soil pH impact on microbial tetraether lipids and terrestrial input index (BIT) in China显示文摘The distributions of microbial tetraether lipids i.e. glycerol dialkyl glycerol tetraethers (GDGTs) were investigated in a variety of Chinese soils featured by a wide range of pH values in different climate zones. The bacterial branched GDGTs and archaeal isoprenoid GDGTs were found to be widely distributed in Chinese soils and their relative abundance was controlled primarily by soil pH. The bacterial bGDGTs usually dominate over archaeal iGDGTs in abundance when the soil pH is below 8.0. However archaeal iGDGTs become dominant and the abundance of halophilic archaea characterized by GDGT V without cyclopentyl ring increases dramatically in the alkaline soil with pH greater than 8.0. The relative abundance of archaeal iGDGTs to bacterial bGDGTs was defined here as RAI index. The RAI index decreases with elevated soil pH and a linear correlation is found between them indicating that the relative abundance of archaeal iGDGTs to bacterial bGDGTs increases with increased pH. The RAI index thus could be a novel proxy of the pH values of paleosol. The terrestrial input index BIT (Branched and Isoprenoid Tetraethers Index) decreases with increased soil pH suggesting that soil pH should be taken into consideration when the terrestrial contribution to marine sediments is estimated by BIT index. Moreover the TEX86 index cannot be used to reconstruct sea surface temperature in the sediments featured by a large terrestrial input. | YANG Huan DING WeiHua WANG JinXiang JIN ChengSheng HE GangQiang QIN YangMin XIE ShuCheng | 2012 | Science China Earth Sciences2012，55，2： | 19 |
| 2 | Experimental investigation of shell modes in two-dimensional phononic crystal consisting of hollow cylinders显示文摘 | MEI Xuefei LIU Gangqiang HE Zhaojian | 2010 | Journal of Applied Physics2010，107，06： | 1 |
| 3 | Silicon mode-loop Mach-Zehnder modulator with L-shaped PN junction for 0.37 V·cm V_(π)L high-efficiency modulation显示文摘Optical signaling without a high voltage driver for electric-optic modulation is in high demand to reduce power consumption,packaging complexity,and cost.In this work,we propose and experimentally demonstrate a silicon mode-loop Mach–Zehnder modulator(ML-MZM) with record-high modulation efficiency.We used a mode-loop structure to recycle light twice in the phase shifter.With an L-shaped PN junction,a comparably large overlap between the PN junction and optical modes of both TE0 and TE1 was achieved to lower the driving voltage or decrease the photonic device size.Proof-of-concept high-efficiency modulation with low VπL of 0.37 V · cm was obtained.Subvoltage Vπcan be realized with a millimeter’s length phase shifter by this scheme,which makes the realization of CMOS-compatible driverless modulation highly possible.40 Gb/s signaling with a bit error rate below the 7% forward-error-correction threshold was then demonstrated with the fabricated ML-MZM,indicating great potential for high-speed optical communication. | JIACHENG LIU GANGQIANG ZHOU JIANGBING DU WEIHONG SHEN LINJIE ZHOU ZUYUAN HE | 2022 | Photonics Research2022，10，1： | 0 |
| 4 | High-speed silicon microring modulator at the 2μm waveband with analysis and observation of optical bistability显示文摘Recently,significantly raised interests have emerged for the 2μm waveband as an extended new window for fiber optic communication.Much research progress has been made on the photonic integrated circuits for the 2μm waveband,especially on the CMOS-compatible silicon-on-insulator wafer.In this work,a silicon integrated microring modulator(MRM)with record high-speed performances at the 2μm waveband was demonstrated.An L-shaped PN junction was specially designed for 2μm to achieve a high modulation efficiency with V_(π)L of 0.85V·cm.The measured 3 dB bandwidth is 18 GHz,supporting up to 50 Gbps signaling at 2μm.Additionally,optical bistability induced by the thermo-optical effect and nonlinear effects was analyzed theoretically and observed experimentally in the 2μm MRM for the first time to our knowledge.Nonlinear coupled mode theory and the Runge-Kutta method were used to simulate the behaviors of bistability in the 2μm MRM.The simulation and experimental results indicate that,when the MRM is launched by a high optical power,the distorted resonant spectrum under an optical bistable state deteriorates the modulation efficiency and signal performances.This work breaks the record of high-speed silicon MRM at 2μm,drawing a promising prospect for the silicon photonic integration and high-speed interconnection at the 2μm waveband,and it provides the referenceable analysis of optical bistability,which guides the design and experimental investigation of 2μm MRM. | Weihong Shen Gangqiang Zhou Jiangbing Du Linjie Zhou Ke Xu Zuyuan He | 2022 | Photonics Research2022，10，3： | 0 |
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