无线激光通信系统弱光干扰技术

为了探求对无线激光通信最有效、最实用的干扰方式，针对目前应用范围最广泛的强度调制/直接检测无线激光通信系统，采用理论分析、仿真和实验相结合的方法详细地研究了无线激光通信系统的弱光干扰的原理和条件，验证了弱光干扰的可行性，发现其干扰现象主要表现为误码率升高。同时，研究了干扰光的不同重复频率、功率和占空比对采用不同通信体制、速率、发射功率等设计的无线激光通信系统产生的不同的干扰原理和现象。发现了同步通信与异步通信因其不同的时钟体制造成的弱光干扰差异，同步通信主要发生“比特干扰”和 “时钟恢复干扰”，异步通信系统主要发生“起始位干扰”和“数据位干扰”。由于异步通信中帧结构和编码都较为简单，与同步通信相比更易受到干扰光的影响，受到干扰的程度更为严重。

Abstract

The intensity modulation direct detection (IM/DD) is widely used for the free space optical (FSO) system currently. In order to explore the most effective and the most practical way to jam the FSO systems, the principle and efficiency of how the low power laser jams the FSO system is researched by using theoretical analysis, simulation and experiment. The feasibility of low-power laser jamming is validated. The jamming phenomenon is mainly manifested as bit error rate increases. At the same time, different principles and phenomena affect by different repetition rates, power and duty cycle of jamming laser on wireless laser communication systems with different communication systems, rates, transmitting power are studied. Because of their different clock systems, synchronous and asynchronous communications have different principles and phenomena. Synchronous communication mainly occurs in the "bit interference" and "clock recovery interference", asynchronous communication system mainly occurs "start bit interference" and "data bit interference." Asynchronous communication that has simple frame structure and coding relatively from synchronous communication can be influenced more easily and serious.

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