多载波光源集成芯片的研究及设计

发布时间：2018-02-26 07:44

本文关键词： 光学频率梳电光调制器多模干涉耦合器　出处：《西安电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：为了提高光纤通信系统的传输容量,世界各地的科学家们对基于多载波的光纤通信系统进行了深入的研究。多载波光源集成芯片是多载波光纤通信系统的核心器件之一。多载波光源的生成方法有很多,其中基于光学频率梳的多载波光源生成方案具有系统结构简单、载波数目可调、频率间隔可调、载波频率稳定等优点成为研究的热点。本文重点关注基于多模干涉耦合器的光学频率梳生成技术。本文首先介绍了多载波光纤通信的发展、几种典型的多载波光源生成方案以及光学频率梳在多载波光源生成和奈奎斯特脉冲生成两方面的应用;然后在分析了电光调制器和多模干涉耦合器的理论基础上,提出了两种不同的、基于多模干涉耦合器的光学频率梳生成方案,并仿真验证了方案的正确性。本论文的主要工作有:提出了一种基于多模干涉耦合器的单边带调制器结构,并利用该调制器构建了循环频移器结构用于生成光梳,分析了单边带调制的工作原理,并推导了理论表达公式,利用VPI仿真软件验证了该方案的正确性,仿真结果显示单边带调制器实现了抑制载波的单边带调制,谐波抑制比20dB,而循环频移器实现了梳线数大于40、频率间隔为5GHz的光学频率梳;提出了一种基于多模干涉耦合器的新型MZ调制器结构,并构建了一种基于该调制器级联结构的平坦光梳生成方案,分析了该调制器的工作原理,并推到了理论表达公式,利用VPI仿真软件仿真验证了该方案的正确性,仿真结果显示通过调整直流偏置电压和微波信号的功率,单个调制器可以生成梳线数为5、平坦度小于0.1dB的平坦光梳,而调制器级联结构实现了梳线数25、平坦度小于0.2dB的平坦光梳,同时仿真验证了该方案生成的光梳频率间隔可调,并实现了间隔为5GHz和8GHz的平坦光梳。
[Abstract]:In order to improve the transmission capacity of optical fiber communication system, Scientists all over the world have made a deep research on the multi-carrier optical fiber communication system. The multi-carrier light source integrated chip is one of the core devices of the multi-carrier optical fiber communication system. There are many methods to generate the multi-carrier light source. The multi-carrier light source generation scheme based on optical frequency comb has the advantages of simple system structure, adjustable carrier number and adjustable frequency interval. The advantages of carrier frequency stability have become the focus of research. This paper focuses on the optical frequency comb generation technology based on multi-mode interference couplers. Firstly, this paper introduces the development of multi-carrier optical fiber communication. Several typical multi-carrier light source generation schemes and optical frequency comb applications in both multicarrier light source generation and Nyquist pulse generation are presented, and then the theory of electro-optic modulator and multi-mode interference coupler is analyzed. Two different optical frequency comb generation schemes based on multimode interference coupler are proposed, and the correctness of the scheme is verified by simulation. The main work of this paper is as follows: a single sideband modulator structure based on multimode interference coupler is proposed. The structure of cyclic frequency shifter is used to generate optical comb. The working principle of single sideband modulation is analyzed, and the theoretical expression formula is deduced. The correctness of the scheme is verified by VPI simulation software. The simulation results show that the single sideband modulator can suppress carrier single sideband modulation, the harmonic suppression ratio is 20 dB, and the cyclic frequency shifter realizes optical frequency comb with comb number greater than 40 and frequency interval of 5 GHz. In this paper, a new MZ modulator structure based on multimode interference coupler is proposed, and a flat comb generation scheme based on the cascade structure of the modulator is constructed. The working principle of the modulator is analyzed, and the theoretical expression formula is deduced. The correctness of the scheme is verified by VPI simulation software. The simulation results show that by adjusting the DC bias voltage and the power of microwave signal, a single modulator can generate a flat comb with a comb number of 5 and a flatness less than 0.1 dB. The modulator cascaded structure realizes the flat comb with the number of comb lines 25 and the flatness less than 0.2 dB. The simulation results show that the frequency interval of the optical comb generated by the proposed scheme is adjustable and the flat comb with intervals of 5GHz and 8GHz is realized.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.11;TN761

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