利用受激布里渊散射产生慢光的最近进展

慢光可以用于数据同步、光存储器和信号处理过程等.介绍了一些最新的使光速减慢的方法及实验结果,重点介绍了在光纤中利用受激布里渊散射的原理产生慢光,以及通过增加泵浦光源的线宽达到增加传输带宽的目的.最后讨论了慢光在实际中的应用前景,并展望了慢光发展的研究方向.     

基于光纤SBS效应的光存储

光信息存储作为全光交换和路由的关键技术,在未来的全光网络中有着重要意义.介绍了一些最新的利用光纤中的受激布里渊散射(SBS)效应实现光存储的实验方法和研究成果,综述了国内外在利用SBS产生可调控光纤慢光方面的研究进展.     

光纤慢光与全光通信技术

全光通信技术是当前的研究热点,而全光缓存器及高速光开关是全光通信技术的两个必备条件.实现全光缓存就必须减慢光速,因此,文章首先综述了国内外慢光技术的演变历程,然后阐述了光纤慢光技术及其在高速全光通信中的应用研究情况,最后提出了当前光纤慢光研究的难点,以及光纤慢光研究对全光通信技术的战略意义.     

利用受激布里渊散射在光纤中实现慢光延迟线的研究进展

综述了近几年来利用受激布里渊散射(SBS)实现慢光延迟线的研究,着重介绍了SBS慢光延迟线在获得长的延迟时间、宽的带宽和控制畸变方面所取得的新的研究成果,指出了SBS慢光延迟线研究中存在的问题及发展方向.     

光纤中受激布里渊散射可控慢光研究进展

介绍了光纤中基于受激布里渊散射可控慢光研究的进展.首先阐述了基于受激布里渊散射慢光系统中布里渊增益谱带宽展宽方面的实验方法和研究成果,其次对具有高折射率的高非线性光纤以及光子晶体光纤作为慢光介质的研究进行了介绍.     

光速控制及器件的发展

1 国内外发展现状 近几年来,国际上关于慢光和快光的研究很热,而且进展很快.产生慢光和快光的基本方法各有不同,各国都在应用不同的方法开展这方面的研究,应用这些基本的物理原理、方法和技术来实现光速控制研究的意义在于,一方面会加深对光的本性认识;另一方面,研究光速控制器件(如慢光器件),可在光通讯、惯性技术、全固化光学延迟线以及激光雷达等系统中应用,给国民经济和国防建设带来新的促进和发展.     

基于相干布居振荡的光控技术及研究进展

慢光在光缓存、光存储技术等方面的潜在应用,将给通信系统带来大的发展空间.利用相干布居振荡(CPO)效应实现光速调控的技术具有独特优势,引起了国内外研究人员的广泛关注.在此介绍了相干布居振荡效应实现光速调控的原理,并阐述了利用该原理实现光速调控技术的研究进展.     

光子晶体慢光波导色散曲线的FDTD计算

首先介绍了光子晶体的原理,以及光子晶体波导在现代光通信中的应用.设计了一种新型的光子晶体慢光波导结构,基于麦克斯韦方程利用有限时域差分法对光子晶体慢光波导的色散关系进行分析,并利用FDTD进行仿真验证.     

基于左手材料波导的慢光产生

通常右手材料中实现慢光的方法包括改变材料色散和波导结构色散,而左手材料的提出除了可以利用上述方法外还为慢光技术的实现提供了全新的方法,并具有室温固体条件下易实现的优点。分析了利用左手材料实现慢光的两种机理,并介绍了当前利用含有左手材料的波导结构实现慢光的研究进展和成果,最后对左手材料在慢光领域的应用做了总结。     

负折射率材料中的慢光技术研究

首先阐述了负折射率材料的反常传播特性,并简要介绍了通常实现慢光技术的原理。随后分析了利用负折射率材料的波导结构实现慢光的几项关键性研究进展,并对含有负折射率材料的波导结构在室温固体条件下实现慢光的原理进行了总结,进而提出当前利用负折射率材料实现慢光所存在的问题以及研究方向,最后简要介绍了这一最新课题的研究意义和应用前景。     

基于相位共轭实现散射成像及光学幻像的双功能散射光调控方法（特邀）

近年来，人们对散射光调控的研究取得了极大的进展，产生了许多有趣的应用。其中透过散射介质的成像和光学幻像是两个极为引人注目的方向，但它们不经常同时被研究。文中将深入探索散射光成像和光学幻像的内在联系，在此基础上提出一种新颖的双功能散射光调控方法以在同一实验装置中根据需求实现散射成像和光学幻像。通过优化光路，结合相位恢复技术检测散射波前，利用相位共轭技术和高分辨率的纯相位液晶空间光调制器可以实现补偿散射的影响或实现特定衍射波前的产生。该系统只需要数秒即可完成散射光调控，因此可以对变化缓慢的散射环境实现动态散射成像或对缓慢变化的物体实现稳定的动态光学幻像。理论分析和实验演示证实了该调控方法的可行性。这一散射光调控方法有望在浑浊介质中的光学成像、光学伪装、反侦察、复杂光场调控等领域找到潜在的应用。     

一维光子晶体慢光波导的FDTD研究

设计了一种新型一维光子晶体慢光波导结构。在常规波导一侧进行了特殊的设计,使波导具有周期性结构,从而具有特殊的色散关系,获得慢光效应。基于麦克斯韦方程利用平面波展开法对光子晶体慢光波导的色散关系进行了分析,获得了波导模以及相应的慢光频率。并利用时域有限差分法（FDTD）对脉冲在波导的传播进行了时域上的模拟,对慢光效应进行验证。     

光纤中可控光速减慢技术研究的最新进展

回顾了减慢光速的研究,介绍了近年来光纤中可控光速减慢技术研究的最新进展,着重介绍了利用受激布里渊散射实现光速减慢的物理机理和实验,讨论了光纤中可控慢光技术研究的意义及应用前景。     

Doing things collaboratively: realizing the advantage or succumbing to inertia?

We explore the nature of the practice of collaboration, focusing in particular on some of the reasons why collaborative initiatives tend to challenge those involved. Two concepts are central to this exploration. The first is collaborative advantage. This captures the synergy argument: to gain real advantage from collaboration, something has to be achieved that could not have been achieved by any one of the organizations acting alone. This concept provides a useful "guiding light" for the purpose of collaboration. The second concept, collaborative inertia, captures what happens very frequently in practice: the output from a collaborative arrangement is negligible, the rate of output is extremely slow, or stories of pain and hard grind are integral to successes achieved.     

基于EIT超材料的太赫兹慢光效应研究进展

太赫兹（Terahertz, THz）波在无线通信、生物医学、无损检测、军用雷达等领域具有潜在的应用前景。研究THz慢光效应对THz通信和检测技术具有非常重要的实际意义。目前已报道的THz慢光效应研究还面临一系列问题。由于具有结构设计灵活和电磁特性可设计的特点,电磁诱导透明（Electromagnetically Induced Transparency,EIT）超材料为THz慢光效应提供了崭新的研究平台。介绍了基于EIT超材料的THz慢光效应的基本原理以及近年来的研究进展,并对THz慢光效应的发展趋势进行了分析和展望。     

Dispersionless and slow unidirectional air waveguide

Unidirectional waveguides and slow light waveguides both play the key roles in the modern communication system. The unidirectional waveguides do not support slow light. The traditional slow light waveguides are always limited to the group velocity dispersion. To combine both the functionalities of unidirectional transmission and slow light into one waveguide, we add a surface defect into unidirectional waveguide to modulate the odd mode dispersion. Through a structure optimizing, a dispersionless and slow unidirectional waveguide is obtained. The waveguide with compound functionalities is confirmed through the frequency-domain and time-domain simulations.     

A review on discoloration and high accelerated testing of optical materials in LED based-products

Reduction of intensity of light output is one of the most common degradation modes in light-emitting diode (LED) systems. It starts from the failure of the various components in the system, including the chip, the driver, and optical components (i.e. phosphorous layer). The kinetics of degradation in real life applications is relatively slow and in most cases it takes several years to see an obvious deterioration of optical properties. Highly Accelerated Stress Testing (HAST) set-up and a methodology to extrapolate the results to real time applications are therefore needed to test the reliability of LED packages and lens materials. Using HAST concept in LED industry is inevitable due to the necessity of assessing the reliability of new products in a short period of time. This paper aims at briefly clarifying the degradation mechanisms of optical components in LED packages and explaining how they contribute to the depreciation of light output of the LED systems. The concept of HAST and the way the reliability of LED packages can be evaluated will also be discussed.     

Error-Free 320-Gb/s All-Optical Wavelength Conversion Using a Single Semiconductor Optical Amplifier

We demonstrate error-free wavelength conversion at 320 Gb/s by employing a semiconductor optical amplifier that fully recovers in 56 ps. Error-free operation is achieved without using forward error correction technology. We employ optical filtering to select the blue sideband of the spectrum of the probe light, to utilize fast chirp dynamics introduced by the amplifier, and to overcome the slow gain recovery. This leads to an effective recovery time of less than 1.8 ps for the wavelength converter. The wavelength converter has a simple configuration and is implemented by using fiber-pigtailed components. The concept allows photonic integration     

Modeling of Loss-Induced Superluminal and Negative Group Velocity in Two-Port Ring-Resonator Circuits

The group velocity v_g of light in two-port ring- resonator (TPRR) circuits with loss is theoretically studied. We point out four possible operation regimes, i.e., "slow" light with positive v_g, "slow" light with negative v_g, "fast" light with negative v_g, and "fast" light with positive v_g, where "slow" means |v_g| < c and "fast" means |v_g| > c, with c denoting the velocity of light in vacuum. The temporal behavior of pulses passing through the TPRR for the four operation regimes and the potential of "slow" light TPRR either with positive or negative v_g for sensing applications are also discussed.