单片集成放大反馈激光器的脉冲包络动力学特性研究

发布时间：2018-02-22 09:48

本文关键词： 半导体激光器光反馈单片集成放大反馈激光器脉冲包络　出处：《西南大学》2017年硕士论文　论文类型：学位论文

【摘要】：光反馈是半导体激光器(SLs)最为常见的外部扰动方式之一。根据外腔往返时间和激光器自身弛豫振荡周期的大小关系可将光反馈SLs系统分为长外腔反馈SLs(LCR-SLs)系统和短外腔反馈SLs(SCR-SLs)系统。SCR-SLs系统中较短的反馈外腔导致系统输出对于反馈光相位十分敏感,即使微小的相位变化也会引起系统的非线性动力学状态显著改变。由于反馈腔中需要置入控制反馈参量的其他元件,搭建离散的SCR-SLs系统比搭建LCR-SLs系统更具难度且难以将外腔长度降到厘米级水平。为了构建更短的SCR-SLs系统,人们提出了基于光子集成技术的实现方案,即将多个功能区集成在同一芯片上成为单片集成放大反馈激光器(AFL)。AFL反馈腔长更短、反馈参量更易调节、性质更稳定、也更适应商用发展。近些年来,国内外相关学者对单片集成AFL输出的非线性动力学特性展开了一系列实验和理论探索。最近实验研究表明单片集成AFL可产生脉冲包络(PPs)动力学态,但系统地对其输出PPs特性的研究还未见报道。本文实验研究了由分布反馈激光器区(DFB区)、相位控制区(P区)以及放大反馈区(A区)所构成的三段式单片集成AFL产生的PPs的动力学特征。借助于AFL输出的功率谱以及时间序列的自相关函数曲线分析了放大反馈区电流I_A和相位控制区电流I_P对PPs的重复频率ν_(PP)和包络规则性的影响。研究结果表明:相对较大的DFB区电流IDFB会使AFL输出两个模式,此时合理调节I_P与I_A可使AFL输出PPs动力学状态。随后的研究中我们将IDFB固定在86.15mA以保证AFL工作在双模区域。对于一给定I_P=96.00 mA,AFL可在两个不连续的I_A区域内呈现PPs状态。随着I_A的增加,AFL输出PPs的重复频率ν_(PP)在I_A较小的区域内呈现单调下降趋势,而在I_A较大区域内会先减小然后出现小范围波动。与此同时,时间序列自相关函数的次最大值σ在I_A相对较小区域内与ν_(PP)的变化趋势相近,而当I_A较大的区域内则呈现出先增大后减小的趋势。对于一给定I_A=9.00mA,I_P的变化会显著影响系统输出PPs的特性,在满足AFL呈现PPs状态的I_P区域内,随着I_P的增加,ν_(PP)呈现出先减小后增大的趋势,σ则表现出与ν_(PP)近似相反的变化趋势。通过观测I_A,I_P连续变化时AFL输出的动力学状态,给出了AFL在I_A和I_P构成的参量空间中呈现PPs分布图谱,并利用σ对PPs动力学规则特性进行了分析及判定。
[Abstract]:Optical feedback is one of the most common external disturbances for semiconductor lasers (SLS). According to the relationship between the external cavity round trip time and the relaxation oscillation period of the laser itself, the optical feedback SLs system can be divided into long external cavity feedback SLS LCR-SLs system and short external cavity feedback SLS system. The short external cavity in the SCR-SLs system causes the output of the system to be very sensitive to the phase of the feedback light. Even a small change in phase can cause a significant change in the nonlinear dynamic state of the system, since other elements that control the feedback parameters need to be placed in the feedback cavity. It is more difficult to build discrete SCR-SLs system than to build LCR-SLs system, and it is difficult to reduce the length of external cavity to centimeter level. In order to build a shorter SCR-SLs system, people put forward a scheme based on photon integration technology. That is to say, multiple functional areas are integrated on the same chip as a monolithic integrated amplifier feedback laser. The feedback cavity is shorter, the feedback parameters are easier to adjust, the properties are more stable, and they are more suitable for commercial development. A series of experiments and theoretical researches have been carried out on the nonlinear dynamic characteristics of monolithic integrated AFL output. Recent experimental studies show that monolithic integrated AFL can produce pulse envelope AFL dynamics state. However, the systematic study of the output PPs characteristics has not been reported. In this paper, the three-segment monolithic integrated AFL, which consists of the distributed feedback laser region, the phase control region and the amplifying feedback region, is experimentally studied. The dynamic characteristics of the generated PPs. By means of the power spectrum of the AFL output and the autocorrelation function curve of the time series, the repetition rate of the amplified feedback current I _ A and the phase-controlled current I _ P to the PPs are analyzed. The results show that the relatively large current IDFB in the DFB region causes the AFL to output two modes. In the subsequent study, we fixed the IDFB at 86.15mA to ensure that the AFL works in the dual-mode region. For a given IAPL 96.00 mAAAFL can present PPs in two discontinuous ISAs. With the increase of PPs, the repetition rate of AFL output PPs shows a monotone downward trend in the smaller area of IAPL. At the same time, the sub-maximum 蟽 of the autocorrelation function of time series is similar to the variation trend of 谓 / PPV in the relatively small region of IStua. However, when the number of PPs is larger, the tendency of increasing first and then decreasing. For a given IP of 9.00 mA-1, the characteristic of output PPs of the system will be significantly affected, and in the IP region which satisfies the PPs state of AFL, the characteristics of the output PPs of the system will be significantly affected, and in the IP region where the AFL presents the state of PPs, the characteristics of the system output PPs will be significantly affected. With the increase of the number of AFL, there is a tendency of decreasing at first and then increasing. 蟽 shows a trend which is approximately opposite to that of AFL. The dynamic state of output of AFL is observed by observing the dynamic state of the output of AFL with continuous variation of IAPs. The distribution of AFL in the parametric space of I _ S _ A and I _ s _ p is given, and the characteristic of PPs dynamic rule is analyzed and determined by 蟽.
【学位授予单位】：西南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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