论文标题:基于光栅光阀（GLV）技术的高速可调谐光通信器件的研究
Study on the Resonator with Eigenvalue Method and Hollow Beam with Its Applications
论文作者 胡云旸
论文导师 张全,论文学位 硕士,论文专业 光学工程
论文单位 浙江大学,点击次数 99,论文页数 77页File Size5421k
2005-01-01论文网 http://www.lw23.com/lunwen_709128017/ 光栅光阀;高速;可调谐激光器;可调谐衰减器
grating light valve; high speed; tunable laser; VOA
DWDM网络由于可以在单根光纤上传输多个波长，所以具有超大的容量，可以大幅度节省光纤数量，这种技术现在被越来越广泛的应用在光通信网络中，DWDM技术的核心就是针对各个波长的操作和控制。随着DWDM技术的发展将会要求整个网络和器件具有更快的速度，更低的成本，更灵活的控制方式。本文正是针对这种发展趋势，以光栅光阀(GLV)技术的特性为基础设计几种高运行速度的光通信器件。 GLV是一种新型的MEMS器件，因为具有较高的光学效率，快速的调制速率，以及较低的量产成本，受到了很大的关注，已经被成功的运用在投影显示和电脑制版领域中，取得很好的效果。 文中首先针对GLV的材料和结构特点，从理论上计算了GLV的特性，如运行时条带可以达到几十MHz的振荡频率，即可知道它可以达到ns级的调谐速度，同时计算了在GLV处于光栅状态时的衍射效果，通过计算衍射时条带之间的相位差，得到了发生衍射时的光强分布情况。 基于GLV的基本特性计算，针对现在已有的可调谐外腔半导体激光器以及可调谐衰减器技术中存在的优缺点，提出了基于GLV技术的新的调谐器件结构。首先设计了基于GLV技术的可调谐外腔半导体激光器系统的结构，在结构中利用GLV的易于控制的特性和共焦结构，使得可以很方便的控制外腔振荡的波长选择，对此系统结构的性能参数进行了详细的分析，在文中给出的结构下可以得到140nm的波长调谐范围，和5.75*10~(-6)nm的输出线宽即0.75MHz的输出频带宽度。 计算和分析了用GLV作为可变光强调谐器件时的参数性能，由于GLV的衍射光中的0级光光强可以随可动条带的下降距离而变化，所以可以得到需要的光强衰减，当使用10位电压驱动器时，计算得到0.03dB的衰减精度，而且衰减范围大于40dB，这种结构的优势是可以用一个GLV一维器件阵列代替网络中的多个VOA器件，既简化了结构，又节省了成本。同时提出了基于GLV技术的光滤波器的应用前景，虽然还未得到完善的结构，可是可以看到这种结构应用的可行性。
Since the DWDM web has a great wavelength volume, multiple wavelengths can be transported in a single fiber, a number of fibers can be saved in this way. So the DWDM technology is applied in the optical communication web more and more now. With the progress of this technique, some request should be met, such as higher speed, lower cost and more flexible control. Following this trend, several optical devices is designed based on grating light valve technology (GLV) in this paper.GLV is a type of novel MEMS devices, which is highly regarded for its high optical efficiency; high switching speed and low manufacture cost. It has been applied in the project and computer plate-making field successfully.Firstly the theoretical calculation is given in this paper based on the material and mechanical characteristics of GLV, including the resonate frequency of the GLV ribbons which can prove the high switching speed; meanwhile the diffraction effect principle when GLV is in the state of grating is given, by calculate the phase error between the ribbons, we get the optical intensity distribution.Based on the elemental characteristics calculation above, the novel device configuration is presented. At first a tunable external-cavity LD structure is designed, which utilizes the easy-controlling advantage and a confocal structure to get a speedy and convenient wavelength selecting, and the tuning range is bigger than 100nm, the output line width is about 5.75*10-6nm. Another device designed based on the GLV is VOA; the operating principle is presented that the intensity of the zero maximum can vary with the displacement of the movable ribbons. When using a 10-bit voltage driver, a 0.03dB attenuating precision can be get and the attenuating range is bigger than 40dB.
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