色散管理和非线性管理控制光孤子群的传输

从描述光孤子传输的非线性薛定谔(NLS)方程出发,给出了色散管理和非线性管理的光孤子的传输方程,利用对称分步傅里叶方法对方程进行数值求解,模拟研究了色散管理和非线性管理控制光孤子在光纤中的传输演化特性。结果表明,只有色散管理控制光孤子群在光纤中的传输,随着传输距离增加,孤子间的相互作用逐渐加剧,如色散管理和非线性管理同时控制光孤子群在光纤中的传输,可极大地抑制孤子间的相互作用,且随着距离增加相邻孤子间的作用几乎不变,这一结果可应用于光孤子群远距离的传输。     

一种非相参雷达回波信号模拟器的设计

分析雷达回波特性,从非相参信号模拟开始,提出一种雷达回波模拟器的实现方法。该方法可以利用已知或计算机产生的目标信息运算获得回波信号数据,通过FPGA或DSP芯片控制DDS产生中频回波信号。这种方法具有极大的灵活性和通用性,只要改变计算机回波信号计算模型或参数,即可实现不同回波信号的模拟。     

Optimal design of a multi-mode interference splitter based on SOI

In this paper, the multimode waveguide lengths and the output port locations of a SOI （silicon on insulator） material-based 1×4 MMI （multimode interference） optical splitter are optimized by means of FD-BPM （finite difference - beam propagation method）. An improved 1×4 MMI optical splitter is designed. Compared with an usual optical splitter, a smaller loss 0. 12dB and a better output port power uniformity 0.11dB are achieved for the optical signal transmission.     

Hybrid Perovskite Quantum Dot/Non-Fullerene Molecule Solar Cells with Efficiency Over 15%

Organic-inorganic hybrid film using conjugated materials and quantum dots (QDs) are of great interest for solution-processed optoelectronic devices, including photovoltaics (PVs). However, it is still challenging to fabricate conductive hybrid films to maximize their PV performance. Herein, for the first time, superior PV performance of hybrid solar cells consisting of CsPbI₃ perovskite QDs and Y6 series non-fullerene molecules is demonstrated and further highlights their importance on hybrid device design. In specific, a hybrid active layer is developed using CsPbI₃ QDs and non-fullerene molecules, enabling a type-II energy alignment for efficient charge transfer and extraction. Additionally, the non-fullerene molecules can well passivate the QDs, reducing surface defects and energetic disorder. The champion CsPbI₃ QD/Y6-F hybrid device has a record-high efficiency of 15.05% for QD/organic hybrid PV devices, paving a new way to construct solution-processable hybrid film for efficient optoelectronic devices.     

40 GHz compact TFMS meander-line bandpass filter on silicon substrate

Presented is a compact millimetre-wave bandpass filter using a thin-film microstrip meander line on standard 0.18 mum CMOS silicon substrate without any post-processing step yet still reducing the substrate loss and crosstalk to a large extent. To miniaturize overall circuit size, a half-wavelength resonator is constructed in meander-line configuration and its resonant frequency is designed to be 40 GHz. The prototype single-resonator bandpass filter occupies a circuit area of 210 times 210 mum on silicon. Measured insertion loss is 2.5 dB, which agrees well with the design value in the simulations.     

柔性有源OLED显示器制造几点技术方面的考虑

AMOLED在柔性显示领域前途似锦。LG显示展示了一款全彩4in柔性AMOLED样机,衬底为80μm厚的不锈钢薄片,曲率达到5cm弯曲半径。本文就此项柔性显示技术所面临的挑战进行了探讨．包括柔性衬底衬底的传送、如何获得特性稳定可靠的TFT以使OLED的亮度和一致性适用于此项技术的商业化推广。     

MEMS湿度传感器信号采集与数字化处理研究

MEMS（微电子机械系统）湿度传感器是利用标准的CMOS技术加上MEMS的后处理技术制造,以其体积小、响应快等优点受到越来越多的重视,介绍了本实验室研制的MEMS压阻式湿度传感器的测试原理、硬件电路的设计和传输函数模型的建立,以及软件设计和封装设计,最后给出了样机的测试结果。     

Two-dimensional air-stable CrSe2 nanosheets with thickness-tunable magnetism

Since Geim et al.firstly separated graphene from graph-ite by mechanical exfoliation method in 2004,the research of two-dimensional (2D) van der Waals (vdW) layered materials has begun[1].Compared with three-dimensional materials,2D vdW layered materials exposing the most atoms to exterior are more sensitive to external control and have the great po-tential applications in electronic,optoelectronic and electro-chemical area[2].     

A Low‐Complexity 128‐Point Mixed‐Radix FFT Processor for MB‐OFDM UWB Systems

In this paper, we present a fast Fourier transform (FFT) processor with four parallel data paths for multiband orthogonal frequency‐division multiplexing ultra‐wideband systems. The proposed 128‐point FFT processor employs both a modified radix‐2⁴ algorithm and a radix‐2³ algorithm to significantly reduce the numbers of complex constant multipliers and complex booth multipliers. It also employs substructure‐sharing multiplication units instead of constant multipliers to efficiently conduct multiplication operations with only addition and shift operations. The proposed FFT processor is implemented and tested using 0.18 µm CMOS technology with a supply voltage of 1.8 V. The hardware‐ efficient 128‐point FFT processor with four data streams can support a data processing rate of up to 1 Gsample/s while consuming 112 mW. The implementation results show that the proposed 128‐point mixed‐radix FFT architecture significantly reduces the hardware cost and power consumption in comparison to existing 128‐point FFT architectures.     

时域有限差分法并行计算中的区域划分及负载平衡

本文讨论了利用网络进行时域有限差分法FDTD并行计算时需要解决的两个关键问题 ,区域划分策略及负载平衡策略。并结合实例进行了试验。最后 ,给出了平面光波导场域FDTD并行计算的实验结论