【摘要】：隨著社會(huì)的發(fā)展和科技的進(jìn)步,人們對(duì)通信網(wǎng)絡(luò)提出了高速度和大容量的要求,光纖通信應(yīng)運(yùn)而生。集成光學(xué)器件不僅是光纖網(wǎng)絡(luò)的重要組成部分,而且促進(jìn)了光纖通信的發(fā)展。作為集成光學(xué)中的關(guān)鍵器件,光調(diào)制器是高速、長距離光通信中不可或缺的一部分。由于微環(huán)諧振調(diào)制器體積小、集成度高,功耗低,因此被廣泛應(yīng)用于集成光電子器件中。在分析微環(huán)諧振調(diào)制器時(shí),傳統(tǒng)的靜態(tài)耦合模理論無法對(duì)微環(huán)諧振器的動(dòng)態(tài)特性進(jìn)行準(zhǔn)確的分析,因此研究可獲得精確結(jié)果、且利于計(jì)算機(jī)編程的動(dòng)態(tài)分析方法十分必要。此外,設(shè)計(jì)可獲得高質(zhì)量調(diào)制輸出信號(hào),且調(diào)制帶寬大、調(diào)制電壓低的微環(huán)諧振調(diào)制器非常重要。結(jié)合這一需要,本文的主要工作如下:(1)針對(duì)分析微環(huán)諧振調(diào)制器已有方法的局限性,提出基于信號(hào)流程圖的動(dòng)態(tài)分析法,采用信號(hào)流程圖動(dòng)態(tài)分析微環(huán)諧振器的場(chǎng)傳輸模型,對(duì)時(shí)間和空間進(jìn)行離散化,實(shí)現(xiàn)精確高效計(jì)算。(2)研究了單環(huán)諧振調(diào)制器的調(diào)制特性。利用正弦信號(hào)和高斯脈沖信號(hào)研究了單環(huán)諧振調(diào)制器在耦合強(qiáng)度調(diào)制、折射率調(diào)制和傳輸損耗調(diào)制這三種調(diào)制模式下的輸出特性,并分析了調(diào)制深度。結(jié)果顯示,耦合強(qiáng)度調(diào)制可獲得極大的調(diào)制帶寬和高質(zhì)量的調(diào)制輸出信號(hào),折射率調(diào)制和傳輸損耗調(diào)制輸出信號(hào)的幅度衰減較大,調(diào)制帶寬受限。(3)研究了耦合強(qiáng)度調(diào)制模式的微環(huán)諧振調(diào)制器,包括含反饋波導(dǎo)的微環(huán)諧振調(diào)制器,基于MZI(Mach-Zehnder Interferometer)耦合區(qū)的微環(huán)諧振調(diào)制器。對(duì)于含反饋波導(dǎo)的微環(huán)諧振調(diào)制器,利用正弦信號(hào)和高斯脈沖信號(hào),分析了反饋臂調(diào)制、微環(huán)調(diào)制和反饋臂與微環(huán)組合三種調(diào)制方式的調(diào)制輸出特性和調(diào)制深度。結(jié)果顯示,通過對(duì)反饋臂的折射率進(jìn)行調(diào)制可以實(shí)現(xiàn)耦合強(qiáng)度調(diào)制,并增強(qiáng)調(diào)制效果,實(shí)現(xiàn)寬帶調(diào)制。對(duì)于基于MZI耦合區(qū)的微環(huán)諧振調(diào)制器,在MZI的上下臂加相位環(huán),可以增強(qiáng)調(diào)制效果。研究并比較了無相位環(huán)、含單個(gè)相位環(huán)、含雙相位環(huán)的微環(huán)諧振調(diào)制器的調(diào)制性能,并對(duì)相位環(huán)的優(yōu)化策略進(jìn)行了研究。結(jié)果顯示,相位環(huán)的引入能增強(qiáng)調(diào)制輸出信號(hào),當(dāng)將相位環(huán)的工作點(diǎn)設(shè)置為諧振點(diǎn)時(shí),會(huì)得到較大的調(diào)制深度和調(diào)制帶寬,其調(diào)制性能更加優(yōu)越。
[Abstract]:With the development of society and the progress of science and technology, people put forward the requirement of high speed and large capacity to the communication network, and optical fiber communication emerges as the times require. Integrated optical devices are not only an important part of fiber network, but also promote the development of optical fiber communication. As a key device in integrated optics, optical modulator is an indispensable part of high-speed and long-distance optical communication. Microloop resonant modulators are widely used in integrated optoelectronic devices due to their small size, high integration and low power consumption. In the analysis of microloop resonant modulator, the traditional static coupled mode theory can not accurately analyze the dynamic characteristics of the microloop resonator, so it is necessary to study the dynamic analysis method which can obtain accurate results and is conducive to computer programming. In addition, it is very important to design a microloop resonant modulator with high quality modulation output signal, large modulation bandwidth and low modulation voltage. According to this need, the main work of this paper is as follows: (1) aiming at the limitation of the existing methods of analyzing the microloop resonant modulator, a dynamic analysis method based on signal flowchart is proposed, and the field transmission model of microring resonator is analyzed dynamically by signal flowchart. Time and space are discretized to achieve accurate and efficient calculation. (2) the modulation characteristics of single ring resonant modulator are studied. Using sinusoidal signal and Gao Si pulse signal, the output characteristics of single ring resonant modulator in three modulation modes, i.e. coupling intensity modulation, refractive index modulation and transmission loss modulation, are studied. The modulation depth is also analyzed. The results show that the coupling intensity modulation can obtain great modulation bandwidth and high quality modulation output signal, and the amplitude attenuation of refractive index modulation and transmission loss modulation output signal is larger. Modulation bandwidth is limited. (3) the microloop resonant modulator with coupling intensity modulation mode, including microloop resonant modulator with feedback waveguide and microloop resonant modulator based on MZI (Mach-Zehnder Interferometer) coupling region, is studied. For microloop resonant modulator with feedback waveguide, the modulation output characteristics and modulation depth of feedback arm modulation, microloop modulation and combination of feedback arm and microloop are analyzed by using sinusoidal signal and Gao Si pulse signal. The results show that the coupling intensity modulation can be realized by modulating the refractive index of the feedback arm, and the modulation effect can be enhanced, and the wideband modulation can be realized. For the microloop resonant modulator based on MZI coupling region, the modulation effect can be enhanced by adding phase loop to the upper and lower arm of MZI. The modulation performance of microloop resonant modulator with no phase loop, single phase loop and dual phase loop is studied and compared, and the optimization strategy of phase loop is studied. The results show that the modulation output signal can be enhanced by the introduction of the phase loop. When the operating point of the phase loop is set to the resonant point, the modulation depth and bandwidth will be larger, and the modulation performance will be better.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN761

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