Simultaneous Compensation of Dispersion and Losses using Er-Doped Double-Core Optical Fiber

The Er-doped double-core dispersion compensating fiber (EDDCF) has been fabricated using modified chemical vapor deposition (MCVD) technique. We have obtained 14 dB gain at 1550 nm (using a diode laser of 980 nm wavelength which provides 100 mW of pump power) with dispersion of about −165 ps/km nm. It is useful for the optical fiber network where amplification as well as negative dispersion is necessary. We are the first to report the experimental realization and characterization of the EDDCF.     

光学补偿LD侧向非均匀泵浦全固化激光器

采用定向棱镜谐振腔、半圆柱面LD阵列交错侧向泵浦两根串接NdYAG激光棒、热传导冷却结构,研制出了一台工程实用的全固化激光器.定向棱镜腔内振荡光线平行于光轴的对称位置交换穿行,匀化了增益,降低了模序数;同时,定向棱镜准相位共轭特性和自准直作用在一定程度上修正波前畸变、热光楔以及热致双折射,保证了大的动态范围内热稳定性,改善了光束质量.激光器采用Cr4+YAG被动调Q,在室温条件下,工作电流为53 A、频率10 Hz时,1.06 μm单脉冲激光能量高于150 mJ、脉宽9 ns、输出稳定度±3%、束散度2.5 mrad且光轴指向稳定,远场分布近似相干平顶高斯光束.     

偏振模色散补偿控制中偏振度技术的性能

基于主偏振态理论，导出了光信号偏振度的解析表达式.并对40 Gb/s光传输系统中的信号偏振度受各种因素的影响进行了数值模拟，包括啁啾、脉冲形状、脉冲宽度、自发辐射噪声以及消光比等.结果表明，偏振度技术能有效地监测和控制40 Gb/s系统中小于37.5 ps的偏振模色散.而且发现就最大化偏振度技术对差分群延时的容许范围而言，脉冲的1/e强度半宽取0.45个位宽（11.25 ps）是最优的.     

应变式压力传感器检测电路的讨论

本文讨论了传统的应变式压力传感器检测电路，给出了改进措施，提高了视在输出，实现了零点调整，补偿了由于温度变化引起的受力弹性体的弹性系数变化和应变片灵敏度系数变化，满足了输出线性度要求。     

计及风和湍流的热晕及其相位补偿的数值研究

本工作用包括热晕、湍流和风等效应的等压近似下四维激光传输程序，数值计算了激光大气传输中的整束热畸变效应及其理想相位补偿，得到了各种情况下的激光大气传输畸变图象，并分析了热晕和湍流的相互作用。另外，还讨论了时、空步长的选取原则。     

GGG晶体板状激光器特性的研究

测试GGG晶体板条的激光性能,并在高功率泵浦下对板条的热聚焦效应进行了研究.     

Diagonally compensated reduction and related preconditioning methods

When solving linear algebraic equations with large and sparse coefficient matrices, arising, for instance, from the discretization of partial differential equations, it is quite common to use preconditioning to accelerate the convergence of a basic iterative scheme. Incomplete factorizations and sparse approximate inverses can provide efficient preconditioning methods but their existence and convergence theory is based mostly on M-matrices (H-matrices). In some application areas, however, the arising coefficient matrices are not H-matrices. This is the case, for instance, when higher-order finite element approximations are used, which is typical for structural mechanics problems. We show that modification of a symmetric, positive definite matrix by reduction of positive offdiagonal entries and diagonal compensation of them leads to an M-matrix. This diagonally compensated reduction can take place in the whole matrix or only at the current pivot block in a recursive incomplete factorization method. Applications for constructing preconditioning matrices for finite element matrices are described.     

热晕瞬态效应的数值模拟

根据瞬态四维（４Ｄ）热晕程序，研究了激光大气传输中热晕瞬变效应及如何过渡到等压近似下的热晕状态，并与等压近似下４Ｄ热晕程序计算结果作了对比，在大约四倍流体力学时间，瞬态４Ｄ热晕程序计算结果逼近等压近似下的结果；另外，还作了相位补偿计算，对光强每平方厘米几千瓦的情况，在理想的自适应光学系统动力学条件下，瞬变阶段的热畸变能相当有效地实时补偿。     

激励销售与准确预测的薪酬机制设计

由于销售人员具有比厂商更多的销售信息，厂商在制定生产计划时需要参考来自销售人员的市场预测。传统的薪酬机制在引导销售人员如实上报预测量方面存在严重不足。Gonik机制虽然可以部分地弥补这一不足，但仍然要由厂商先提供参考定额和相应奖金数值。本发展了一种不需要厂商提供参考定额值而直接由销售人员自己参与提出定额确定奖金并努力销售的薪酬机制。章论证了它的有效性，并导出了在设计合同参数时，需要注意的一些规则和约束，对实际操作有一定的指导意义。     

A TRANSPLANTABLE COMPENSATION SCHEME FOR THE EFFECT OF THE RADIANCE FROM THE INTERIOR OF A CAMERA ON THE ACCURACY OF TEMPERATURE MEASUREMENT

Radiance coming from the interior of an uncooled infrared camera has a significant effect on the measured value of the temperature of the object. This paper presents a three-phase compensation scheme for coping with this effect. The first phase acquires the calibration data and forms the calibration function by least square fitting. Likewise, the second phase obtains the compensation data and builds the compensation function by fitting. With the aid of these functions, the third phase determines the temperature of the object in concern from any given ambient temperature. It is known that acquiring the compensation data of a camera is very time-consuming. For the purpose of getting the compensation data at a reasonable time cost, we propose a transplantable scheme. The idea of this scheme is to calculate the ratio between the central pixel’s responsivity of the child camera to the radiance from the interior and that of the mother camera, followed by determining the compensation data of the child camera using this ratio and the compensation data of the mother camera Experimental results show that either of the child camera and the mother camera can measure the temperature of the object with an error of no more than 2°C.