半导体激光器光注入特性及其应用
文献类型：学位论文
| 作者 | 卢洪斌 |
| 学位类别 | 博士 |
| 答辩日期 | 2001 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 王向朝 |
| 关键词 | 半导体激光器 光频调制 波长转换 四波混频 3R再生 |
| 中文摘要 | 本文主要研究半导体激光器在外部注入光作用下的理论和实验，以及半导体激光器光注入特性在波长调制、光强调制、波长变换、光信号3R再生和色散补偿等方面的应用。在半导体激光器的调制中，直接注入电流光频调制同时会使光强发生变化，实验证明通过光注入半导体激光器光频调制的方法可控制光强的波动。据此我们提出了光强反馈控制光频调制方案，可使光频调制中光强不跟随光频变化。光强调制实验中发现光注入多量子阱半导体激光器的光强调制度随其偏置电流的增加而周期变化，这是由于载流子消耗、带间吸收和F-P腔选模等综合作用的结果。在强度调制注入光的波长为增益曲线中吸收和受激发射平衡点对应的波长时，半导体激光器的光强波动完全被消除。由光热调制半导体激光器物理模型出发，从理论上推导出半导体激光器结温变化与相关物理量的关系式，并从光热调制实验中得出光强调制同调制频率及半导体激光器偏置电流的关系，为选择半导体激光器恰当的光热调制参数，以降低光强调制的干扰，从而实现纳米精度干涉测量提供重要依据。本文还计算了长腔DFB-LD中基于非简并四波混频(NDFWM)的波长转换效率，由耦合波方程的解，得出波长转换效率与腔长、泵浦光功率、线性增益系数、DFB-LD谐振光与注入光的频率失谐量等的关系。计算结果表明，通过增大泵浦光功率、线性增益系数和腔长可有效地提高波长转换效率。因而可通过SOA与DFB集成在一起提高线性增益，这样可大幅度提高NDFWM波长转换效率。在全光信号再生的研究中，提出了两种基于NDFWM多波长转换的注入锁定定时和光注入电吸收调制器定时的全光3R再生方案。克服了交叉增益和交叉相位调制仅适用于单波长转换的限制，适合于光节点多波长转换和再生的应用。半导体激光器和SOA在波长转换性能方面有各自的优点，文中也涉及了基于SOA的波长转换，并给出了光信号双向注入DFB/SOA的NDFWM波长转换的实验方案，此方案不仅可消除偏振相关性，而且能提高波长转换的效率。在基于SOA的NDFWM波长转换器中，我们提出了圆偏振泵浦光注入SOA的方法，该方法理论上可完全消除偏振相关性。 |
| 英文摘要 | In this thesis, the characteristics of laser diode (LD) with external injection light are studied theoretically and experimentally. And the corresponding applications in wavelength modulation, optical intensity modulation, wavelength conversion, optical signal 3R regeneration, and dispersion compensation are demonstrated. In the modulation of LD, the fluctuation of LD output intensity is concurrent with frequency modulation by injection current. This unexpected effect can be controlled by modulating LD frequency through external injection light, which has been proved by experimental results. Accordingly, we put forward schemes of frequency modulation using feedback of output intensity to eliminate the intensity fluctuation. In the experiment of intensity modulation of multi-quantum well (MQW) LD with external injection light, we found that the intensity-modulation depth varied periodically with the increase of injection current. This is caused by carrier depletion, interband carrier absorption, and mode competition in Fabry-Perot cavity. At the equilibrium point of absorption and stimulated emission, which corresponds to the wavelength of the injecting light, the intensity variation of light source can be eliminated completely. According to the physical model of a LD modulated by photothermal effect, we deduced theoretically and verified experimentally the relationships of the photothermal intensity-modulation depth of the LD with the modulation frequency and injection current. This study is important to determine appropriate modulation frequency and injection current in LD interferometer with a photothemal modulation to reduce the influence of light-intensity modulation and realize nanometer-accuracy interferometric measurements. We also calculated the wavelength-conversion efficiency based on nondegenerate four-wave mixing (NDFWM) in a long-cavity distributed feedback (DFB) LD. From the coupled wave equations, we obtained the relationship between the wavelength conversion efficiency and the cavity length, pump power, linear gain and frequency detuning, respectively. It is made clear that we can get higher wavelength conversion efficiency by increasing pump power, cavity length and gain. Hence, by integrating semiconductor optical amplifier (SOA) with DFB, NDFWM wavelength conversion efficiency can be improved because of the increased linear gain. In the research of ali-optical 3R regeneration, we developed two 3R regeneration methods based on NDFWM multi-wavelength conversion. One is by injection locking, and the other is by electro-absorption. The methods overcame the limit that cross-gain modulation and cross-phase modulation can only be used in single-wavelength conversion. Thus they are suitable for multi-wavelength conversion and optical signal 3R regeneration in optical network nodes. Since wavelength conversions by LD and SOA have their own advantages, we also studied the wavelength conversion by SOA. And we presented an experimental scheme of NDFWM wavelength conversion with optical signals injected into DFB/SOA from both sides, which not only has polarization-insensitivity but can increase the conversion efficiency. In the NDFWM wavelength conversion by SOA, we presented a method that the pumps are injected polarization-orthogonally into SOA. Theoretical analysis indicated this method could eliminate polarization sensitivity completely. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15528]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 卢洪斌. 半导体激光器光注入特性及其应用[D]. 中国科学院上海光学精密机械研究所. 2001. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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