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Optical trimming of electro-optical polymer devices using photo-bleaching .

机译：使用光漂白对光电聚合物器件进行光学修整。

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摘要

This thesis details the effects of photobleaching on electro-optic polymers. A different aspect of view on this traditional weakness is to use it for optical trimming of finished devices. This work involves the characterization of newly developed electro-optical (EO) polymer, the design and fabrication of polymer waveguide devices, understanding the cause of photobleaching, and exploring the application for optical trimming.;Different EO polymers were studied to exploit the potentials of nonlinear polymer and to overcome some practical issues. A modulator made of cross-linkable PSDA-AJL4, which employs Diels-Alder reaction to overcome nonlinearity-stability tradeoff, has demonstrated great thermal stability at 85°C. New poling scheme was developed for AJL8/APC, a high r33 guest-host polymer, to improve the poling efficiency up to 30% in a low Vpi modulator. CLD1/APC was used for the study of photobleaching.;The relation between oxygen and photobleaching was further studied in this work. Photo-oxidation appears to be the dominant cause for bleaching even at exposure wavelength away from resonance. While most bleaching process is under low exposure intensity, we demonstrated that a focused laser beam with wavelength at absorption peak can cause oxygen depletion and introduce saturated bleaching. This technique allowed us to have accurate control of index change at order of 10-4 so as precise positioning of the bleached area.;Wavelength-insensitive biasing of a polymer Mach-Zehnder modulator was demonstrated using photobleaching to adjust the optical path mismatch. The resulted modulator shows a reduction by a factor of 17 in bias dispersion, which can significantly increase the usable wavelength range of a MZ modulator before the second order distortion effects start to limit the SFDR.;Coupling tuning using photobleaching on polymer ring modulators was studied with different configurations of coupling and bleaching positions. The primitive results show at least 7dB improvement for extinction of transmission at resonance. A ring modulator with -22dB extinction was obtained after optical trimming.
机译：本文详细介绍了光漂白对电光聚合物的影响。关于这一传统缺点的不同观点是将其用于成品器件的光学修整。这项工作涉及新开发的电光（EO）聚合物的表征，聚合物波导器件的设计和制造，了解光漂白的原因以及探索光学修整的应用。；研究了不同的EO聚合物以挖掘其潜力。并克服了非线性聚合物的一些实际问题。由可交联PSDA-AJL4制成的调制器利用Diels-Alder反应克服了非线性稳定性折衷方案，在85°C时表现出出色的热稳定性。针对高r33客体聚合物AJL8 / APC开发了新的极化方案，以在低Vpi调制器中将极化效率提高至30％。 CLD1 / APC用于光漂白的研究。氧与光漂白之间的关系得到了进一步的研究。即使在远离共振的曝光波长下，光氧化似乎也是导致漂白的主要原因。虽然大多数漂白过程都是在低曝光强度下进行的，但我们证明了波长在吸收峰处的聚焦激光束会导致氧耗竭并引入饱和漂白。该技术使我们能够将折射率变化精确控制在10-4的数量级，以便精确定位漂白区域。演示了使用光漂白来调节光路失配的聚合物Mach-Zehnder调制器的波长不敏感偏置。所得调制器的偏压色散降低了17倍，这可以在二阶失真效应开始限制SFDR之前显着增加MZ调制器的可用波长范围。；研究了在聚合物环调制器上使用光漂白的耦合调谐具有不同的耦合和漂白位置配置。原始结果表明，在共振时，传输的消光至少提高了7dB。光学修整后，获得了-22dB消光的环形调制器。

著录项

  • 作者

    Kuo, Ying-Hao.;

  • 作者单位

    University of Southern California.;

  • 授予单位 University of Southern California.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 107 p.
  • 总页数 107
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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