一种新型的输出缓存式光分组交换节点性能分析

光缓存和波长变换是解决光分组竞争的有效方法.提出一种称为FCOB的新型光分组交换节点结构,它使用固定波长变换器和输出式光缓存来解决光分组的竞争.针对FCOB交换结构,还提出一种有效的竞争控制算法.最后,使用仿真实验对FCOB的性能进行了评估.仿真结果表明,虽然使用的是固定波长变换器,但FCOB交换结构仍具有良好的性能.     

Graphene-based silicon modulators

Frontiers of Information Technology & Electronic Engineering - Silicon photonics is a promising technology to address the demand for dense and integrated next-generation optical...     

温度对光纤频率传输系统稳定性的影响及其补偿

为抑制温度对基于光纤的频率传输系统稳定性的影响,建立了相应的物理模型.并进行了定量分析.结果表明.温度的缓慢变化不会影响频标信号的短期稳定性.但会使其长期稳定性变差.因此,在高稳定光纤频率传输系统中.必须通过相位补偿来有效地抑制温度引入的相位噪声.在此基础上进行了仿真研究和实验检测.仿真结果表明,通过该补偿技术可以在环...     

高灵敏度振荡场生物传感器的理论与实验研究

利用双面金属包覆波导中的超高阶导模对导波层折射率极其敏感的特性,提出一种新型的生物传感器。与传统的表面等离子共振、泄漏波导以及反对称波导等消逝场生物传感器相比,该传感器的待测样品放置在导波振荡场中,样品折射率的微小变化都将引起输出光强的极大改变,从而极大提高了传感器的灵敏度和分辨率。初步的实验结果显示在现有噪声水平下至少能够分辨1ppm的葡萄糖溶度改变。预计该传感器将在环境监测、食品安全、生物医学和疾病诊断等领域有着极其广泛的应用前景和巨大的市场潜力。     

多信道WDM系统非线性相位噪声的研究

利用在频率范围内的噪声传输函数研究当色散主导和非线性主导时非线性相位噪声传输,并基于多信道多光纤段的WDM系统,利用LEM-SSFM数值方法计算非线性光纤系统的SNR,从传输距离,信号功率和放大器的数量三个角度研究非线性相位噪声的传输及其对系统性能的影响。     

可变带宽光网络路由与资源分配研究

文章针对灵活速率光信道数据单元（ODUflex）以及带宽可变光正交频分复用（OFDM）两种光网络分别提出路由与速率分配和路由与频谱分配课题。该课题将降低系统总能耗作为最优化目标,采用最优化软件ILOG CPLEX进行仿真,分别提出了相应的启发式算法,并将最优化结果同启发式算法的结果进行了性能上的比较与讨论。     

High-efficiency dye-sensitized solar cells based on robust and both-end-open TiO2 nanotube membranes

In the present work, dye-sensitized solar cells (DSSCs) were fabricated by incorporating transparent electrodes of ordered free-standing TiO₂ nanotube (TNT) arrays with both ends open transferred onto fluorine-doped tin oxide (FTO) conductive glass. The high-quality TiO₂ membranes used here were obtained by a self-detaching technique, with the superiorities of facile but reliable procedures. Afterwards, these TNT membranes can be easily transferred to FTO glass substrates by TiO₂ nanoparticle paste without any crack. Compared with those DSSCs consisting of the bottom-closed membranes or attached to Ti substrate, the carefully assembled and front-side illuminated DSSCs showed an enhanced solar energy conversion efficiency as high as 5.32% of 24-μm-thick TiO₂ nanotube membranes without further treatments. These results reveal that by facilitating high-quality membrane synthesis, this kind of DSSCs assembly with optimized tube configuration can have a fascinating future.     

A high dynamic range analog-front-end IC for electrochemical amperometric and voltammetric sensors

A wide input range, compliant with electrochemical amperometric and voltammetric sensors analog-front-end (AFE) integrated circuit (IC) is proposed. The AFE employs current integrator (CI) and trans-impedance amplifier (TIA) to deal with the input current in the order of nA and μA separately, achieving the advantage of high dynamic range and high resolution. Input voltage is converted to current through a series of precise resistances, and detected by CI or TIA, which making the input voltage range is not limited by the power supply. An incremental sigma-delta ADC is employed to digitize the transferring signal, reducing the complexity and power dissipation. Compared to other alternatives, the AFE could handle current and voltage signals simultaneously, and input voltage range is not limited by power supply, showing high dynamic range and resolution. The AFE IC is fabricated in 0.18 μm 1P5M mixed-signal CMOS process, occupies an area of 3.2 mm×2 mm, the readout circuit has a dynamic range of 120 dB, consumes 4.2 mA.     

Optofluidic microring dye laser embedded in polydimenthylsiloxane with reduced threshold

We demonstrate an integrated optofluidic microring dye laser with a relatively low threshold on a polydimenthylsiloxane(PDMS) chip.The chip was fabricated through conventional soft lithography.It consists of a liquid waveguide with microring structure providing the feedback.A reduced threshold is realized due to the unique design of the bus waveguide across the center of the microring structure,which results in a great reduction in the cavity losses.Laser dye rhodamine 6G(R6G) dissolved in benzyl alcohol was injected into the microfluidic channel as the gain medium.When the dye laser was pumped with a pulsed laser at 532 nm,the dye laser oscillation was achieved with a threshold of only 4?5 μJ mm-2.The convenience in fabrication and operation makes the optofluidic microring dye laser a promising underlying photonic component in the integrated optofluidic systems.