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提出并研究了一种线性腔结构的基于SESAM（半导体可饱和吸收镜）的被动调Q光纤光栅掺铒光纤激光器,该激光器无需采用偏振控制器控制激光偏振态,简化了调Q激光器的结构。该激光器的中心波长为1 549.975nm,阈值功率为143mW,斜效率为1.2%。当泵浦功率从149mW增加到180mW时,脉冲重复频率从5.431kHz增加到9.778kHz。当泵浦功率为155mW时,激光脉冲的能量为5.6nJ,重复频率为6.538kHz,脉冲宽度为40μs。

文章采用自适应均衡技术对偏振模色散（PMD）进行补偿,给出了判决反馈均衡器（DFE）结构,通过对前向均衡器（FFE）部分的改进,得到了适用于高速光纤通信系统的行波滤波器（TWF）及折叠级联的TWF结构,最后通过ADS仿真软件,得到了系统S参数仿真结果。

文章分析了影响光纤通信系统性能的主要因素,介绍了在理论分析的基础上建立的单模光纤信道仿真模型;还介绍了判决反馈均衡器（DFE）的基本结构和最小均方（LMS）误差算法,并用MATLAB软件仿真了采用LMS算法对10 Gbit/s光纤信道进行自适应均衡的性能。仿真结果表明,LMS算法简单、高效,能有效消除光纤色散和偏振模色散（PMD）引起的码间干扰,比较适合对均衡速度要求较高的光纤通信系统。

随着光纤信道传输速率的提升,偏振模色散（PMD）成为了限制光纤通信系统传输距离的主要因素,电域补偿技术是解决方案之一,但它又受到硬件实现复杂度及运算速度的限制。文章将并行处理技术及块最小均方（BLMS）算法应用到PMD补偿技术中,为电域补偿技术在高速通信系统中的应用提供了一条新的途径。

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Northeast Plain is one of the most important soybean-producing areas in China. Phosphorus can be used to optimize the fertilization for the growth of soybean seedlings, root development, and crop resistance to natural disasters, such as drought. The depth of cultivated land can also affect the soil nutrient content. Compared with no tillage treatment, shallow and deep tillage can improve the soil structure and environment of the tillage layer for the soil nutrient content. A combination of exogenous media and cultivation has been widely used to improve the soil structure and physicochemical properties in recent years. Therefore, it is of great significance to understand the variations in the soil phosphorus that are caused by exogenous media and cultivation modes in black soil areas. Previous research of phosphorus form was focused mainly on individual fertilization or the regulation of individual cultivation modes. It is very necessary to explore the interaction and impact of maize straw returning to the field, and then apply the different cultivation modes to the soil phosphorus. In this study, a series of field experiments were carried out to monitor the effects of different tillage modes and straw returning on the soil phosphorus components in various stages. The results indicate that: 1) Straw returning significantly enhanced the stability of the soil environment and the fixation capacity of soil phosphorus. The total phosphorus (TP) content of the soil increased by 31% after deep tillage (DP) combined with 9750kg/hm² of straw returning to the field. (2) Straw also improved the soil environment and phosphatase content. Compared with the shallow tillage (SP), the DP combined with 9750 kg/hm² of straw increased the content of acid and alkaline phosphatase to 12% and 32.5%, respectively. The application of 9750 kg/hm² of straw for the DP resulted in the lowest content of soil phytase in the critical period, when the soybean plants needed phosphorus; Compared with the CK, the phytase content decreased by 11.3%-19.4%. (3) The Langmuir model better represented the phosphorus adsorption data, compared with the Freundlich. The maximum adsorption of phosphorus was evaluated as well. The maximum phosphorus adsorption capacity, phosphorus adsorption affinity constant, and maximum buffer capacity of straw treatment were 2.4%-8.3%, 8.3%-13.9%, and 2.2%-26.3% lower than those of CK treatment, respectively. (4) Both straw application and DP treatment improved the soil phosphorus availability. According to Hedley's phosphorus grading, the DP combined with straw returning promoted the soil phosphorus components under different environments. The content of unstable phosphorus in the soil was always higher than that of the CK group. The application of straw significantly increased the phosphorus content of each component in the soil, indicating the greatest impact on the unstable phosphorus component. The regulation model of DP combined with 9750 kg/hm² straw returning to the field improved the effective phosphorus content in the soil, when applying 9750 kg/hm² maize straw during deep cultivation. The highest soybean yield reached 1425kg/hm², indicating a better improvement in the soybean yield. The finding can provide a scientific basis to improve the utilization efficiency of soil phosphorus. Strong reference and guidance can also be offered to maintain the soil fertility and farmland soil cultivation in black soil areas. [ABSTRACT FROM AUTHOR]

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