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首页> 外文学位 >Peripheral-coupled-waveguide multiple quantum well electro-absorption modulator for high efficiency, high spurious free dynamic range and high frequency RF fiber-optic link.
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Peripheral-coupled-waveguide multiple quantum well electro-absorption modulator for high efficiency, high spurious free dynamic range and high frequency RF fiber-optic link.

机译：外围耦合波导多量子阱电吸收调制器，可实现高效率，高无杂散动态范围和高频RF光纤链路。

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摘要

Currently the high-capacity long-span terrestrial and undersea transmission links are all fiber-optic links. For analog fiber-optic links, in order to have high RF link gain, large spurious free dynamic range (SFDR), small noise figure and large bandwidth, the requirements for the modulator are small insertion loss, large modulation efficiency, high optical power handling capacity and large bandwidth.; Electro-absorption modulators (EAM) play an important role in the analog fiber-optic link due to its large modulation efficiency, large bandwidth and small size. But in conventional EAMs, the electrical waveguide and the optical waveguide share the same waveguide structure. Many trade offs are made in order to meet both the electrical requirements and optical requirements. These trade-offs are: (1) The waveguide width is limited to 2--3mum. This narrow waveguide width reduces the coupling from/to the optical fibers. It also causes large optical propagation loss. Thus the insertion loss is big. The large propagation loss also limits the device length to 200--400mum and eventually limits the modulation efficiency. (2) The active intrinsic electro-absorption (EA) layer thickness is limited to 0.2--0.4mum. This prevents us from getting large modulation efficiency. (3) The device capacitance (in lumped-element EAM) or capacitance per unit length (in traveling-wave EAM) with these limited waveguide width, waveguide length, and EA layer thickness are still too large to achieve large bandwidth.; In this dissertation we propose a novel peripheral-coupled-waveguide (PCW) EAM, in which the electrical waveguide and the optical waveguide structure are decoupled, so that the optimizations for both structures are allowed. The low insertion loss, large modulation efficiency (i.e. low Vpi), high optical power handling and large bandwidth can be achieved simultaneously.; The proposed PCW-EAM has an optical waveguide width of 12mum, an electrical waveguide width of 1 mum and the active EA layer thickness of 0.1 mum. The 1.3mm long non-traveling wave PCW-EAM exhibits an insertion loss of 10.2dB, an equivalent Vpi of 1.6V and the optical saturation power larger than 80 mW. The optic link using this EAM has achieved RF link gain of -3dB, multi-octave SFDR of 118 dB-Hz2/3, sub-octave SFDR of 132 dB-Hz 4/5 and estimated noise figure of 14 dB.; With limited fabrication facility, the traveling wave PCW-EAM demonstrates a 3dB bandwidth of 10GHz with the electrical waveguide width of 3mum. This number agrees well with the theoretical calculation. A much larger 3dB bandwidth can be predicted using traveling-wave PCW-EAM with improvement in metal electrode thickness and electrical waveguide width.
机译：当前，大容量的大跨度地面和海底传输链路都是光纤链路。对于模拟光纤链路，为了具有高射频链路增益，大无杂散动态范围（SFDR），小噪声指数和大带宽，对调制器的要求是插入损耗小，调制效率高，光功率处理能力强容量和大带宽。电吸收调制器（EAM）由于其高调制效率，大带宽和小尺寸，在模拟光纤链路中起着重要作用。但是在传统的EAM中，电波导和光波导共享相同的波导结构。为了满足电气要求和光学要求，需要进行许多折衷。这些折衷是：（1）波导宽度限制为2--3mum。这种窄的波导宽度减小了与光纤的耦合。它还会导致较大的光传播损耗。因此插入损耗大。较大的传播损耗还将设备长度限制为200--400μm，并最终限制了调制效率。 （2）有源本征电吸收（EA）层厚度限制为0.2--0.4μm。这阻止了我们获得较大的调制效率。 （3）具有有限的波导宽度，波导长度和EA层厚度的设备电容（集总元件EAM）或每单位长度的电容（行波EAM）仍然太大而无法获得大带宽。本文提出了一种新颖的PCW EAM，其中电波导和光波导结构被解耦，从而可以优化两种结构。可以同时实现低插入损耗，大调制效率（即低Vpi），高光功率处理和大带宽。所提出的PCW-EAM具有12μm的光波导宽度，1μm的电波导宽度和0.1μm的有源EA层厚度。 1.3mm长的非行波PCW-EAM的插入损耗为10.2dB，等效Vpi为1.6V，光饱和功率大于80 mW。使用此EAM的光链路实现了-3dB的RF链路增益，118 dB-Hz2 / 3的多倍频程SFDR，132 dB-Hz 4/5的次倍频程SFDR和14 dB的估计噪声系数。由于制造设备有限，行波PCW-EAM的3dB带宽为10GHz，电波导宽度为3mum。这个数字与理论计算非常吻合。使用行波PCW-EAM可以预测到更大的3dB带宽，同时金属电极厚度和电波导宽度也得到改善。

著录项

  • 作者

    Zhuang, Yuling.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 175 p.
  • 总页数 175
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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