互注入1550nm-VCSELs系统的多次偏振转换特性研究

发布时间：2018-01-15 22:36

本文关键词：互注入1550nm-VCSELs系统的多次偏振转换特性研究　出处：《西南大学》2015年硕士论文　论文类型：学位论文

【摘要】：垂直腔表面发射激光器(VCSELs)具有发散角小,阂值电流低,单纵模输出,易于集成等优点,在光通信、光储存和光开关等方面应用广泛。其中,VCSELs的偏振转换(PS)特性研究备受关注。现有报道中呈现的多次PS现象大多是由电流引发的,而关于电流以外的其它系统参量连续变化所导致的多次PS现象的研究较少。互注入VCSELs系统中的耦合参量和两个VCSELs的中心频率是影响其动力学状态并易于控制的关键参量,所以上述参量对Ps特性的影响有较大的研究价值。本文基于自旋反转模型(SFM),理论研究了互注入VCSELs系统中参数连续变化所引起的多次偏振转换(PS)特性。研究结果表明：连续改变互注入强度、两个互注入VCSELs中一个激光器的激射频率以及同时连续改变两个激光器的激射频率,均可产生多次的PS。连续改变互注入强度引起的多次PS之间间隔比较均匀,并给出了能发生PS的互注入系数极大值与耦合延时的关系；固定一个激光器激射频率,连续改变另一个激光器的激射频率也会导致多次PS,其中激射频率相对较小的激光器PS更稀疏；同时改变两激光器激射频率出现的多次PS具有很好的周期性。对于以上情形,越大的耦合延时时间都会导致多次PS更密集,PS的上升沿和下降沿更陡峭。
[Abstract]:Vertical cavity surface emitting laser (VCSELs) has the advantages of low divergence angle, low threshold current, single longitudinal mode output, easy integration and so on. It is widely used in optical communication, optical storage and optical switch. The study of polarization conversion (PS) characteristics of VCSELs has attracted much attention. Most of the PS phenomena in current reports are caused by current. However, few studies have been done on the multiple PS phenomena caused by the continuous variation of other system parameters other than current. The coupling parameters and the central frequency of two VCSELs in the interinjection VCSELs system affect the motion of the system. Key parameters in mechanical state and easy to control. Therefore, the influence of the above parameters on the properties of Ps is of great value. This paper is based on the spin inversion model (SFM). The properties of multiple polarization conversion (PSs) caused by the continuous variation of parameters in the VCSELs system are studied theoretically. The results show that the mutual injection intensity is changed continuously. The excitation frequency of one laser in the two mutually injected VCSELs and the continuous change of the laser excitation frequency of the two lasers at the same time. The interval between PS caused by continuous change of mutual injection intensity is uniform, and the relationship between the maximum of mutual injection coefficient and coupling delay is given. When one laser is fixed, the PSs of another laser can be changed continuously, and the PS of the laser with a relatively small laser frequency is more sparse than that of the other laser. For the above case, the longer the coupling delay time is, the more steep the rise edge and descent edge of PS are.
【学位授予单位】：西南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248

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