大角度蚀刻衍射光栅的模拟

研究了平面波导密集波分复用器件中很有发展潜力的蚀刻衍射光栅(EDG).小角度范围光栅的模拟通常采用高斯近似的输入光场,由于近轴的高斯光场接近实际光场,所以模拟结果很准确.但这种方法应用于大角度范围的光栅则有偏差.本文提出了大角度蚀刻衍射光栅的模拟方法,分析了这种偏差并给出了模拟结果.事实上这种方法也适合于实际任意输入光场的模拟.     

甲基戊糖的双波长紫外分光光度分析法

对一种甲基戊糖的分光光度法加以改进，采用正交设计法选择实验中试剂量的最佳组合，并分析了测定中相关参数的影响。该法简单、快速、精确、灵敏度高，检测线性范围为2－90mg/L，测量鼠李糖的相对误差为2.6%。文中还以实际发酵液作为分析对象，用高压液相色谱法验证了该检测技术的可靠性。     

Study of Internal Wavelength Locker Integrated 10 Gbps Electro-Absorption Modulated Laser Modules in Metro DWDM Applications

Several different divergences are tested in the several internal wavelength locker schemes for 10 Gbps electro-absorption modulated laser (EML) module. A 10 Gbps EML module with a simple and robust internal wavelength locker for metro dense WDM application is successfully demonstrated. The wavelength aging over 2000 h is done at elevated temperature of 70°C. The average wavelength drift of 10 modules is measured to be ± 5 pm. These modules can be successfully applied to the 10 Gbps DWDM systems with 50 GHz channel spacing.     

Transmission Characteristics of Several Kinds of Filters for WDM Optical Networking

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Thermally Stabilized Fiber-Bragg-Grating Vibration Sensor Using Servo Motor Control

A fiber-Bragg-grating (FBG) vibration sensor, in which an FBG acts as an intensity-modulator for incident narrow spectrum light such as a laser, is thermally stabilized. Sensitivity of the sensor is kept constant over a wide range of temperature by feeding back a fraction of the output signal into the laser source in such a way that by shifting the oscillation wavelength of the laser the dc component of the detected photocurrent remains unchanged regardless of change in the environmental temperature. Variation in the sensor sensitivity is reduced to as small as 3 dB after the stabilization, although it is more than 55 dB without the stabilization.     

Changing photo-written Bragg wavelengths of fiber gratings via one phase mask and four mirrors

A phase mask interferometer is developed to photo-write long gratings with arbitrary Bragg wavelengths. In this system, the fiber Bragg grating is photo-written by UV interference stripes of 193 nm reflected from two rotatable mirrors and two fixed mirrors, where the phase mask is not only used as a beam splitter, but also initialized the reference quantity of Bragg wavelength; the fixed mirrors are used for reducing the incident angle; the rotatable mirrors are used for adjusting the corresponding photo-written Bragg wavelength. It is worth noting that the photo-written length is fourfold as high as the length in the Talbot interferometer with the same mirror size.     

双折射对基于半导体光放大器的干涉型器件性能影响的模拟分析研究

分析了半导体光放大器中双折射对基于半导体光放大器的干涉型器件性能的影响，对基于半导体光放大器的马赫—曾德尔型波长转换器的理论计算表明，当半导体光放大器有双折射存在时，消光比不仅要比无双折射时的要低，而且还随着探测光的偏振态而改变，变化幅度可大于10dB。提出了减小双折射对干涉型器件影响的方案，并且分析了实现对增益和对相位变化同时具有偏振不灵敏的半导体光放大器的可能性。     

用于波分复用的缺陷态复周期结构光子晶体滤波器的研究

利用传输矩阵法，研究了一种用于波分复用的光子晶体滤波器。该结构是中间包含一个缺陷层的一维三层念质的光子晶体，叫做缺陷态复周期结构光子晶体。通过数值计算得出它的色散关系和滤波特性。当改变缺陷层的厚度并保持其折射率不变时，带隙中将出现个数不同的局域模。缺陷层厚度增加时，局域模数也随着增加。适当调节缺陷层厚度，使带隙中出现八个窄带滤波窗口，能很好的用作八通道波分复用一解复用滤波器。由于很高的传输率和低的传输损耗，故在高速，长距离光通信中将有很好的应用。     

全光网络中动态业务下的阻塞性能分析

通过对自适应路由和动态备选路由算法的性能分析,研究了波长选择和波长交换这两种类型的全光网络在动态业务下的阻塞性能,并提出了将动态波长分配与自适应路由选择相结合的算法.数值结果表明:1)相比波长交换网络而言,多纤波长选择网络是更为经济且切实可行的选择;2)动态备选路由算法可以获得与自适应路由算法相似的性能,并且文中所提出的算法能够更好的提高网络的阻塞性能.分析表明:不同算法的性能与网络拓扑的连接度以及备选路由的数目密切相关.