Mechanical Properties of Polycarbonate Optical Fibers

This article presents experimental results for mechanical and optomechanical tests under different environmental conditions on polycarbonate optical fibers. These fibers are used in optical fiber sensors and data transmission applications with operation temperatures up to 125 C. As shown in the article, fiber properties are not sensitive to moisture cycles or low temperatures (40 C), but they are significantly affected by temperatures over 85 C.     

Influence of Parameters of Optical Fibers on Optical Soliton Interactions

The interaction between optical solitons is of great significance for studying interaction between light and matter and development of all-optical devices, and is conducive to the design of integrated optical path. Optical soliton interactions for the nonlinear Schr¨odinger equation are investigated to improve the communication quality and system integration. Solutions of the equation are derived and used to analyze the interaction of two solitons.Some suggestions are put forward to weaken their...     

温度对掺铒光纤光谱特性影响研究

不断提高以掺铒光纤为核心的光纤器件功率是研究与应用领域中的一个重要课题。高功率光纤器件内能量聚集会发热升温,造成器件光谱参数性能显著变化,进而造成以掺铒光纤为核心的光学器件的性能发生显著变化。因此对掺铒光纤在大温度范围下的光谱性能进行研究具有重要意义。利用斯塔克能级展宽理论建立了掺铒光纤吸收系数与温度的关系模型,在此基础上结合McCumber理论仿真计算了掺铒光纤荧光寿命与温度的关系。以OFS-MP980型掺铒光纤为实验对象,测量了掺铒光纤在常温至900 ℃范围内的吸收光谱、发射光谱。结果表明,温度升高造成980 nm波段吸收系数整体下降,且吸收系数的峰值波长增加,平均增加率0.625 nm/100 ℃。1 530 nm波段吸收系数整体展宽,且峰值吸收系数下降,平均下降率为-0.19 dB/100 ℃。600 ℃以内荧光寿命随温度呈近似线性下降,下降率为-0.23 ms/100 ℃。600 ℃以内理论模型能够反应温度造成峰值吸收系数、荧光寿命近似线性变化的趋势。     

载氢光纤光致折变布拉格光栅

报道用１９３ｎｍＡｒＦ准分子激光，经过石英相位版的空间调制，在载氢增敏处理过的通信光纤上写入光致折射率变化的布拉格光栅，在光栅布拉格波长上（λ＝１．５３μｍ）测得的反射率大于９０％，半高全宽线宽小于０．６ｎｍ。     

Influence of the Wavelength on the Bandwidth in W-Type Plastic Optical Fibers

Journal of Russian Laser Research - We investigate the bandwidth and steady-state losses of multimode W-type plastic optical fibers solving the time-dependent power flow equation and show how the...     

Analysis of Long-Term Optical Effects in Double-Coated Optical Fibers Induced by Hydrostatic Pressure and Thermal Loading

The hydrostatic pressure and thermal loading simultaneously induced optical effects in double-coated optical fibers in the long-term are analyzed by the viscoelastic theory. Using the Laplace transformation method, close-form solutions for the microbending loss and refractive index changes are obtained. The results of the microbending loss are initially identical to those obtained by the elastic analysis, and then decrease gradually as time progresses. The microbending loss and refractive index changes of the glass fiber are functions of the material properties of the primary and secondary coatings. To minimize the microbending loss and refractive index changes in the long-term, the Young's modulus of the primary coating, and the viscosity and Poisson's ratio of the secondary coating should be increased. Nevertheless, the viscosity and Poisson's ratio of the primary coating, and the Young's modulus of the secondary coating should be decreased.     

端面光斑对阶跃光纤中轴对称导模功率的影响

由波动方程的积分解导出了光纤中各轴对称传导模式传输功率的解析表达式, 该式包含了入射光对模式功率的影响, 同时也反映了不同阶次模式间的差别. 在此基础上, 以高斯光斑模拟光纤端面的实际光斑, 讨论了聚焦情况对各轴对称模式间功率分配情况的影响. 结果表明, 把工作频率和聚焦情况综合起来加以调整, 可达到压制某些模式而提升另一些模式的目的.     

不同封装光纤低温测温性能研究

基于拉曼散射的分布式光纤温度传感器由于具有抗电磁干扰、耐高压、可连续测温等优点,在超导电缆及相关超导电力装置中具有潜在应用场景.在超导电缆低温运行环境中,常规光纤封装材料耐低温性能差,其收缩变形会降低光纤测温性能甚至破坏光纤结构.本文对低温下不同封装光纤测温性能展开研究,选择四种光纤样品,在77～287 K温度区间内对其进行了稳态和动态温度测量实验,分析了低温下不同封装材料、结构和厚度等因素对光纤测温性能的影响,给出了适用于液氮低温测温的光纤封装材料和结构,实验验证了聚烯烃紧套光纤在时间和空间上连续测温的可行性.     

Temperature Dependence of Resonant Four Wave Mixing in Erbium-Doped Optical Fibers

Temperature dependence of resonant four-wave mixing (RFWM) in an erbium-doped optical fiber without amplification is investigated experimentally. A large change in the refractive index resulting from the transition absorption is induced in the erbium-doped fiber. The maximum reflectivity of RFWM at 0.3 m fiber length increases from 4.1% to 5.5% with change in temperature from 40°C to - 196°C. The temperature-dependent reflectivity characteristics correspond to the change in the absorption cross section at 1.53 μm wavelength.     

Influence of Mechanical Effects on the Hydrogen Peroxide Concentration in Aqueous Solutions

Physics of Wave Phenomena - An experiment has been performed, where water enriched in hydrogen peroxide was subjected to multiply dilution under mechanical action. It is established that, when the...     

生长温度对Ga掺杂ZnO薄膜光电性能的影响

在不同衬底温度(室温~750 ℃)条件下,采用脉冲激光沉积(PLD)方法在石英玻璃和单晶硅(111)衬底上制备了Ga掺杂ZnO(GZO)薄膜。结果显示:衬底温度的变化导致衬底表面吸附原子扩散速率和脱附速率的不同,从而导致合成薄膜结晶质量的差异,衬底温度450 ℃时制备的GZO薄膜具有最好的结晶特性;GZO薄膜中载流子浓度随衬底温度升高而单调减小的现象与GZO薄膜中的本征缺陷密切相关,晶界散射强度的变化导致迁移率出现先增大后减小的趋势,衬底温度450 ℃时制备的GZO薄膜具有最小的电阻率~0.02 Ω·cm;随着衬底温度的升高,薄膜载流子浓度的单调减小导致了薄膜光学带隙变窄,所有合成样品的平均可见光透过率均达到85%以上。采用PLD方法制备GZO薄膜,衬底温度的改变可以对薄膜的光电性能起到调制作用。     

温度和电场作用下保偏光纤对方位传递的影响

针对基于保偏光纤的非通视方位传递系统中温度与电场引起的方位传递误差,从非通视方位传递系统的工作原理出发,分别推导了基于温度、电场作用保偏光纤的方位角解算模型,并仿真分析了保偏光纤长度、热膨胀系数及电场振幅等因素对方位传递精度的影响.实验结果表明,当温度为20℃时,方位角解算误差对温度不敏感;当温度高于20℃时,方位角解...     

Recent Progress of Optical Fibers

This paper reviews recent progress of advanced optical fibers that are expected to be as candidates for the future trunk-line systems, metropolitan networks and access lines for subscribers.     

温度对萘酞菁LB膜光学特性的影响

本文采用线性吸收谱研究了温度对两种不同结构的萘酞菁分子LB膜光学特性的影响。研究发现,加热可以使它们在LB膜中的聚集体离解,四叔丁基萘酞菁锌的LB膜结构较三叔丁基氰基萘酞菁的LB膜要稳定。     

制导光纤强度的依赖关系

分析研究制导高强度光纤强度8个方面的依赖关系，指出光纤强度降低的关键原因是光纤中存在着缺陷即表面微裂纹。因此，必须从制造工艺、制造环境入手，严格控制减少微裂纹方能制造出过2％筛选应变的高强度光纤。     

The Influence of Temperature on C153 Steady-State Absorption and Fluorescence Kinetics in Hydrogen Bonding Solvents

In a recent paper (J Fluoresc (2011) 21:1547–1557) a temperature induced modulation of Coumarin 153 (C153) fluorescence lifetime and quantum yield for the probe dissolved in the polar, nonspecifically interacting 1-chloropropane was reported. This modulation was also observed in temperature dependencies of the radiative and nonradiative rates. Here, we show that the modulation is also observed in another 1-chloroalkane—1-chlorohexane, as well as in hydrogen bonding propionitrile, ethanol and trifluoroethanol. Change in the equilibrium distance between S ₀ an S ₁ potential energies surfaces was identified as the source of this modulation. This change is driven by temperature changes. It leads to a modulation of the fluorescence transition dipole moment and it is the primary source of the experimental effects observed. Additionally, we have found that proticity of the solvent induces a rise in the fluorescence transition dipole moment, which leads to a shortening of the fluorescence lifetime. Hydrogen bonds are formed by C153 also with hydrogen accepting solvents like propionitrile. We show that while such bonds do not affect the transition probability, they do change the S₀ an S₁ energy gap which in turn implies a change in non-radiative transition rate in a similar way as in protic solvents, as well as in the fluorescence spectrum position. Finally, the influence of temperature on the energies of hydrogen bonds formed by C153 when acting as hydrogen donor or acceptor is reported.     

类明孤子在光纤中传输特性的变分研究

应用变分法,研究了微扰对类明孤子在光纤巾非线性传输特性的影响,导出了类明孤子脉冲参量演化的动力学方程。它统一了在单模光纤、色散缓变光纤或色散控制光纤中类明孤子脉冲参量演化的动力学方程。在此基础上,计算了色散缓变光纤中的线性高阶色散微扰。结果表明：线性高阶色散对类明孤子脉冲的位置和相位有影响,而对振幅、宽度和啁啾没有影响;光纤色散缓变对类明孤子脉冲的所有参量均有影响。     

饱和光纤中的各阶孤子及孤子相互作用

首先研究了非线性饱和光纤中各阶孤子存在的幅值范围，与标准非饱和情况的非线性薛定谔孤子非常不同，即一阶孤子幅值范围是１．４≤Ｎ≤∵．０，二阶孤子为４．０≤Ｎ≤♀．０，三阶孤子为７．０≤Ｎ≤≤１５．０，并分析了各阶孤子的传输特性，最后研究了双一阶孤子相作用的若干特点，明确了五个方面的特性。     

伽马辐照对掺铒光纤性能影响的研究

为了推进掺铒光纤抗辐射性能的研究,全面掌握掺铒光纤性能在辐照条件下的变化规律。基于色心模型对掺铒光纤的辐照作用机理进行了分析,并据此对掺铒光纤在辐照中的性能变化趋势进行了预测推断。然后根据掺铒光纤的工作原理和应用特性,在伽马辐照条件下对两种不同型号(EDF-L-980和MP980)掺铒光纤的980 nm波段损耗谱、1 530 nm波段损耗谱以及发射光谱的特性进行了在线实时监测,并在辐照停止后进行了恢复测量。研究表明,在辐照中两种掺铒光纤的性能变化趋势一致。在损耗谱方面,980 nm波段和1 530 nm波段的损耗随辐照单调增加,980 nm吸收峰与1 530 nm吸收峰处的损耗与辐照剂量呈近似线性关系;在发射光谱方面,发射光谱强度随辐照单调降低,光谱能量向长波方向转移,平均波长和光谱带宽大幅增加,1 530 nm发射峰处的发光强度与辐照剂量也呈近似线性关系。辐照停止后,掺铒光纤体现出了一定的恢复能力,但是各项参数的恢复均不到40%。各项实验结果与理论模型和分析预测匹配良好,证明了辐照对掺铒光纤性能影响理论解释的合理性。     

碳涂覆光纤的最新进展

本文首先介绍了气密性光纤的发展过程，接着重点分析了碳涂覆光纤的两个重要参数：长期可靠性和抗氢渗透性。引入了新的衡量碳涂覆光纤抗氢渗参量－缺氢渗因子，最后介绍了西安应用光学研究所碳涂覆光纤“八．五”末的进展情况，以及国内外现状比较。