Cost-effective 10 Gb/s polymer-based chip-to-chip optical interconnect

Board-level optical links are an attractive alternative to their electrical counterparts as they provide higher bandwidth and lower power consumption at high data rates. However, on-board optical technology has to be cost-effective to be commercially deployed. This study presents a chip-to-chip optical interconnect formed on an optoelectronic printed circuit board that uses a simple optical coupling scheme, cost-effective materials and is compatible with well-established manufacturing processes common to the electronics industry. Details of the link architecture, modelling studies of the link's frequency response, characterisation of optical coupling efficiencies and dynamic performance studies of this proof-of-concept chip-to-chip optical interconnect are reported. The fully assembled link exhibits a -3 dBe bandwidth of 9 GHz and -3 dBo tolerances to transverse component misalignments of ±25 and ±37 μm at the input and output waveguide interfaces, respectively. The link has a total insertion loss of 6 dBo and achieves error-free transmission at a 10 Gb/s data rate with a power margin of 11.6 dBo for a bit-error-rate of 10 -12. The proposed architecture demonstrates an integration approach for high-speed board-level chip-to-chip optical links that emphasises component simplicity and manufacturability crucial to the migration of such technology into real-world commercial systems. © 2012 The Institution of Engineering and Technology.

超重环境对斑马鱼仔鱼早期发育和耳石形态学与化学组成的影响

目的本研究以模式动物斑马鱼为研究对象,通过研究超重下鱼体的早期发育和耳石变化,探讨了脊椎动物前庭系统对超重环境的适应机制。方法斑马鱼受精卵在受精后10h分别置于1G和5G重力环境中,观察鱼体发育状态和耳石的形态;使用Zeiss软件比较1G和5G下耳石大小;使用EDAX检测耳石微化学成分含量变化。结果1)斑马鱼从鱼卵向早期仔鱼发育过程中超重环境影响仔鱼发育,耳石形态在初期显著变大(P<0.01),其后耳石变小;2)EDAX检测表明,耳石中S和Sr含量升高,Na和Ca的含量减少;3)出现矢耳石与微耳石融合的现

滇池试验围隔内不同形态铁浓度的变化与物化因子的关系

在蓝藻水华形成以后,通过围隔实验,从2003年6月份到10月份定期采样测定水体中的pH、溶解氧(DO)、水温、总铁、亚铁、过滤性铁(<0.45μm)和可溶性磷的浓度,研究物化因子对不同形态铁浓度变化的影响。实验结果表明,蓝藻水华优势种微囊藻在pH 7—9和水温17.5—20.5℃的条件下,生长旺盛,消耗了大量的亚铁,使亚铁浓度大幅度下降;溶解氧和磷酸盐对亚铁浓度没有显著影响;在水华蓝藻严重发生的条件下,水体中的总铁和过滤性铁浓度没有显著意义的变化,而亚铁浓度的变化与水华蓝藻的种群密度成显著负相关(r=-0

Synthesis and luminescence properties of erbium silicate thin films

We have studied the structure and the room temperature luminescence of erbium silicate thin films deposited by rf magnetron sputtering. Films deposited on silicon oxide layers are characterized by good structural properties and excellent stability. The optical properties of these films are strongly improved by rapid thermal annealing processes performed in the range of temperature 800-1250 °C. In fact through the reduction of the defect density of the material, a very efficient room temperature photoluminescence at 1535 nm is obtained. We have also investigated the influence of the annealing ambient, by finding that treatments in O2 atmosphere are significantly more efficient in improving the optical properties of the material with respect to processes in N2. Upconversion effects become effective only when erbium silicate is excited with high pump powers. The evidence that all Er atoms (about 1022 cm-3) in erbium silicate films are optically active suggests interesting perspectives for optoelectronic applications of this material. © 2007 Elsevier B.V. All rights reserved.

围隔中鲢和菹草控藻效果及其生态学意义

在滇池沿岸的池塘中 ,构建了面积为 10 0m2 ,水深为 85cm ,底质均为淤泥的四个围隔 ,其中在三个围隔内分别放养密度为 10 0g/m3 、75g/m3 、5 0g/m3 的鲢。它们均在一定程度上控制浮游植物的生物量并改善水体透明度 ,其中初始放养鲢 75g/m3 的围隔控制效果最明显。放养三种密度的鲢在有效控制微囊藻水华的同时 ,原先水体的优势种类发生质的变化 ,水体中浮游植物的多样性也明显增加。放鱼 2个月后 ,在生物操纵的围隔中同时种入菹草 ,在75g/m3 的鲢控藻的围隔中 ,菹草长势良