High-speed large-area surface-normal multiple quantum well modulators
High-speed large-area surface-normal multiple quantum well modulators
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DOI：
10.1117/12.507768
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发表时间：
2004-01
期刊：
影响因子：
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通讯作者：
P. Goetz;R. Mahon;T. Stievater;W. Rabinovich;S. Binari
中科院分区：
文献类型：
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作者：
P. Goetz;R. Mahon;T. Stievater;W. Rabinovich;S. Binari
自1998年以来，海军研究实验室一直在开发用于自由空间光(FSO)通信链路的调制反向反射器(MRR)。对于包含具有权重或功率限制的一个节点的非对称链路，例如地对空链路，使用MRR是有益的。MRR配置将大部分功率、重量和指向要求转移到一个节点上。要在任何重要距离闭合MRR链路，调制器的面积必须相当大。使用较大的面积会限制数据速率，因为电容与面积成正比。电阻也取决于器件的大小，尽管不是以相同的方式。为了提高数据率，我们设计了一种顶层金属触点，以减小半导体电阻率的影响。使用这种新的顶部触点设计，使用相同的晶片结构，S的上升时间从大约2.6μ减少到60 ns。然而，增加数据速率会增加功率输入并导致自加热，从而改变多量子调制器的最佳工作波长。在此基础上，设计了一种新的耦合量子阱结构。新的设计降低了所需的驱动电压，从而降低了功耗，提高了产量，并简化了驱动电路。较低的功率输入还降低了波长对调制率的依赖。
Since 1998, the Naval Research Laboratory has been developing modulating retro-reflectors (MRR) for free-space optical (FSO) communication links. Using an MRR is beneficial for asymmetric links containing one node with weight or power constraints, such as ground-to-air links. An MRR configuration shifts most of the power, weight, and pointing requirements onto one node. To close an MRR link at any significant distance, the area of the modulator must be fairly large. Using a large area limits the data rate, since capacitance is proportional to area. Resistance also depends on device size, although not in the same manner. To increase the data rate, we designed a top metal contact that diminishes the effect of the semiconductor resistivity. Using this new top contact design decreases the rise time from approximately 2.6 μs to 60 ns using the same wafer structure. However, increasing the data rate increases the power input and results in self-heating, which changes the optimal operating wavelength of MQW modulators. Accordingly, a new coupled quantum well structure is designed. The new design lowers the required drive voltage, which in turn lowers the power consumption, increases yield, and simplifies drive circuitry. The lower power input also reduces the modulation rate dependence of the wavelength.