Intro
Preface
Introduction
Contents
1 Optical Wirelss Coherent Detection: An Overview
1.1 Optical Wireless Coherent Communication
1.2 Optical Wireless Communication: Development Status
1.3 Research Status at Home and Abroad
1.3.1 Inter-Satellite Coherent Optical Detection
1.3.2 Coherent Optical Detection in Optical Fiber Communication
1.3.3 Free-Space Coherent Detection Communication System
1.4 Research Status on Factors Affecting Performance of Free-Space Coherent Detection Systems

1.5 Research Status on Factors Affecting Partially Coherent Beam Coherent Detection System
1.6 Research Status of Wavefront Correction
1.6.1 Research Status of Atmospheric Turbulence Compensation Technology
1.6.2 Research Status of Wavefront Correction Technology Abroad
1.6.3 Domestic Research Status of Wavefront Correction Technology
References
2 Coherent Optical Communication
2.1 Basic Principles of Coherent Optical Communication
2.1.1 Fundamentals
2.1.2 Homodyne Detection
2.1.3 Heterodyne Detection
2.1.4 Detection of an Amplitude Modulated Signal

2.2 Coherent Modulation and Demodulation
2.2.1 Optical Modulation
2.2.2 Coherent Demodulation
2.2.3 System Performance
2.3 Factors Affecting Detection Sensitivity
2.3.1 Phase Noise
2.3.2 Intensity Noise
2.3.3 Polarization Noise
2.3.4 Key Technologies of Coherent Optical Communication Systems
2.4 Spatial Phase Conditions for Optical Heterodyne Detection
2.4.1 Spatial Phase Difference Conditions
2.4.2 Frequency Conditions
2.4.3 Polarization Conditions
2.5 Homodyne Detection and Heterodyne Detection
2.5.1 Homodyne Coherent Detection

2.5.2 Heterodyne Detection
2.6 Composition of Heterodyne Detection System
2.6.1 Wavefront Correction Module
2.6.2 Polarization Control Module
2.6.3 Laser Frequency Stabilization Module
2.6.4 Balanced Detection Module
2.6.5 Coherent Demodulation Module
2.7 Performance Analysis of Heterodyne Detection System
2.7.1 Signal to Noise Ratio and Detection Sensitivity of Heterodyne Detection System
2.7.2 Performance Analysis of Heterodyne Detection System Under Ideal Conditions
2.7.3 Performance of Heterodyne Detection System with Optical Alignment Error

2.8 Signal-to-Noise Ratio, Bit Error Rate and Detection Sensitivity
2.8.1 Signal-to-Noise Ratio of Direct Detection and Heterodyne Detection
2.8.2 Bit Error Rate of Direct Detection and Heterodyne Detection
2.8.3 Analysis of Detection Sensitivity of Direct and Heterodyne Detection
2.9 Influence of Wavefront Distortion on Spatial Coherent Optical Communication
2.9.1 Principle of Wavefront Distortion
2.9.2 The Effect of Wavefront Distortion
References
3 Spatial Light to Fiber Coupling and Beam Control
3.1 Space Optical-Fiber Coupling Technology