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首页> 外文期刊>Applied optics >Analysis and demonstration of coupling control in polymer microring resonators using photobleaching
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Analysis and demonstration of coupling control in polymer microring resonators using photobleaching

机译：使用光漂白的聚合物微环谐振器耦合控制的分析和演示

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摘要

We describe postfabrication trimming of coupling in both laterally and vertically coupled polymer micror-ing resonators (MRRs), using photobleaching. For both cases, a tapered directional-coupler-based simple analytical model is developed to simulate the change in coupling due to a bleaching-induced decrease in refractive index. A tightly focused laser beam spot (a few kilowatts per square centimeter) is used to precisely bleach the coupling region alone. Coupling control is achieved for (1) high-Q passive rings by bleaching the vertically coupled chromophore-doped bus waveguide, and for (2) laterally coupled electro-optic ring modulators, by bleaching both the ring and the waveguide in the coupling region. The power coupling ratio (PCR) of an undercoupled high-Q MRR filter is reduced by 0.54 percentage points for the TE mode, causing the MRR finesse to increase from a value of 72 to 108. For a ring modulator, the PCR was increased by 3.5 percentage points for the TM mode, causing a 6 dB increase in extinction ratio, to achieve a final value of nearly 25 dB. Phase/group-delay characterization confirmed that the ring was trimmed toward critical coupling.
机译：我们描述了使用光漂白在横向和纵向耦合的聚合物微谐振器（MRR）中对耦合的制造后微调。对于这两种情况，都开发了基于锥形定向耦合器的简单分析模型，以模拟由于漂白引起的折射率降低而引起的耦合变化。紧密聚焦的激光束斑（每平方厘米几千瓦）仅用于精确漂白耦合区域。通过漂白垂直耦合的生色团掺杂的总线波导，可以实现对（1）高Q无源环的耦合控制，以及通过对耦合区域中的环和波导进行漂白，可以实现（2）横向耦合的电光环形调制器的耦合控制。对于TE模式，未耦合的高Q MRR滤波器的功率耦合比（PCR）降低了0.54个百分点，从而导致MRR的精度从72增至108。对于环形调制器，PCR增大了TM模式为3.5个百分点，导致消光比增加6 dB，最终值接近25 dB。相/群延迟表征证实环被修整为临界耦合。

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