基于自零差相干探测的光通信与测量技术研究
文献类型：学位论文
| 作者 | 蔡光宇 |
| 文献子类 | 博士 |
| 导师 | 孙建锋 研究员 |
| 关键词 | 自零差相干接收 self-homodyne coherent detection 激光线宽 laser linewidth 合成孔径激光成像雷达 synthetic aperture ladar 空间激光通信 free-space optical communication |
| 其他题名 | Research on optical communication and measurement technology based on self-homodyne coherent detection |
| 英文摘要 | 自零差（SH）相干接收由于其结构简单，能够自动消除相位干扰等优势在自由空间光通信和远距离激光探测等领域被广泛研究和应用。本文在广泛调研自由空间光通信技术以及合成孔径激光成像雷达技术的基础上，指出了自零差接收技术在这两方面的代表应用技术差分相移键控（DPSK）和直视合成孔径激光成像雷达（SAIL）的不足之处，针对这些不足，分别提出了一种正交偏振相位调制发射、自零差相干探测接收的相干光通信系统与相位编码调制发射、自零差接收的SAIL结构，这两类SH系统在结构上基本相同，为激光通信和雷达的一体化奠定了技术基础。 针对正交偏振相位调制、自零差相干探测接收的相干光通信系统，论文首先根据系统结构用数学表达式推导了从发射调制到接收解调的过程，分析了理论条件下的系统性能与相位反馈控制系统的性能。随后论文介绍了基于本系统的高速相干激光通信实验验证工作，验证了系统的通信功能并且测量了系统的灵敏度，实验结果表明，该体制可以降低大气湍流的影响。 传统SAIL对于光源线宽的选择通常基于相干条件。论文首先从SAIL的成像原理入手，根据统计光学的相关知识用数学公式推导了激光线宽与方位向脉冲间相位误差的关系，给出了数值计算结果。用蒙特卡洛的方式模拟了给定光源线宽下的点目标成像过程，数值计算出SAIL成像质量参数的均值和方差随激光光源线宽的变化关系，对实际合成孔径激光成像雷达的设计具有指导意义。 本文还开展了基于DPSK调制、自零差相干探测的测距技术研究，进行了单距离目标点和双距离目标点的实验，得到将相位补偿用于接收结构的必要性，讨论了多点测距的实验结果。提出了兼容相干激光通信与合成孔径激光成像雷达的自差接收一体化方案，公式推导了其成像原理和理论分辨率，介绍了一体化的两种可能方式。; Self-homodyne(SH) coherent detection has been widely studied and applied in free space optical(FSO) communication and long range laser radar due to its property of auto phase noise cancellation. Based on surveys on FSO and synthetic aperture imaging ladar(SAIL), either one of the SH application in the two fields, namely DPSK and down-looking SAIL, is identified with its weakness. To avoid these weaknesses, an FSO system with orthogonally polarized BPSK transmission and self-homodyne receiving and an SH SAIL scheme with phase coded transimission are proposed. These new systems’ structures are nearly the same, which lay foundation for the intergration of FSO and ladar. The modulation and demodulation process of the new SH FSO system based on orthogonally polarized binary phase shift keying(BPSK) is deduced utilizing mathematical equations, the ideal performace and the phase feedback control system are analyzed. The high speed coherent laser communication experimental validation work is established to validate the communication function and to measure the sensitivity. The experimental results show that this scheme could alleviate the atmospheric degradation. Traditional limit on the laser linewidth in SAIL is based on the coherence condition. The relation of the laser linewidth with SAIL’s inter-pulse phase error is mathematically deduced and numerically evaluated based on the processing of the SAIL’s demodulated signal using statistical optics. A point target’s SAIL imaging process is simulated using Monte Carlo method, the results of which demonstrates the relation of the configured image quality parameters with laser linewidth. This work acts as reference for the practical SAIL system’s design. The ranging technology of DPSK modulated, SH receiving structure is studied. One ranging point and two ranging point experiments are respectively conducted, the results show the necessity of phase compensation within the delay interference arm, while the results of two point experiment are discussed. The integration SH scheme of optical communication and synthetic aperture imaging is proposed, and the two possible working condition is discussed. |
| 学科主题 | 光学工程 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/30967]  |
| 专题 | 中国科学院上海光学精密机械研究所 |
| 作者单位 | 中国科学院上海光学精密机械研究所 |
| 推荐引用方式 GB/T 7714 | 蔡光宇. 基于自零差相干探测的光通信与测量技术研究[D]. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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