A label swapping scheme of an optical labeled signal with differential phase shift keying (DPSK) for label at 2.5 Gb/s and pulse position modulation (PPM) for payload at 40 Gb/s is demonstrated by simulation. Power penalties of ?1.8 and ?0.8 dB are achiev
Employing nonlinear spectral imaging technique based on two-photon-excited fluorescence and second-harmonic generation (SHG) of biological tissue, we combine the image-guided spectral analysis method and multi-channel subsequent detection imaging to map a
为实现非互易光传输的主动控制，提出了一种基于石墨烯光子晶体和磁光半导体材料的结构，通过对磁光半导体外加磁场，打破时间反转对称，获得了非互易的磁Tamm态等离子体激元(MTPP)。通过分析不同条件下的透射谱，研究了结构参数、外加磁场，以及石墨烯化学势对MTPP的影响。结果表明，通过调控外加磁场和石墨烯化学势，可以实现单向光传输的主动控制以及正、反双向光传输的灵活转换。该结构及其调控方法在光二极管和光开关等应用领域具有潜在的应用价值。
本文将Sargent,Scully和Lamb的二能级单模激光全量子理论推广到共下能级三能级双模激光系统中,获得了三个能级都有泵浦情况下的共下能级三能级原子系统双模激光运转的主方程。考虑到细致平衡与宏观平衡之间的对应性,合理地应用细致平衡原理得到定态运动方程。通过引入一个参数H,从而获得了形式解。利用运动方程和形式解,讨论了不同条件下的一些运转特性和光子统计分布的变化.
We investigate the nonvolatile holographic storage characteristics of near-stoichiometric LiNbO3:Fe:Mn crystals with different Li2O contents. Experimental results indicate that the optimal value of Li2O content is about 49.6 mol%. Nonvolatile sensitivity
We report on the first electrically pumped continuous-wave (CW) InAs/GaAs quantum dot (QD) laser grown on Si with a GaInP upper cladding layer. A QD laser structure with a
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对空基光电对抗平台可见光变焦镜头进行了光机结构设计以及被动消热差设计,依据-20~50 ℃的工作温度指标要求,对变焦镜头进行光机热集成分析。用Patran软件对镜头加载温度应力,计算光机结构的热弹性变形,用Nastran软件解算热变形后各光学元件镜面节点的刚体位移。用Sigfit光机接口软件分析变形后每个透镜表面的Zernike系数,将结果导入Zemax中,预判镜片面型变化以及刚体位移变化对调制传递函数(MTF)与波前差的影响。实验结果表明,在-20~50 ℃的温度载荷下,后固定组的最大轴向位移可达6.1
The Ho3 /Pr3 co-doped NaYF4single crystals with various Pr3 concentrations and constant Ho3 molar percentage of ~1% were grown by an improved Bridgman method. Compared with the Ho3 single-d