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空间光通信中激光调制器的调制频率和输出光功率直接影响光通信速率和链路距离。为兼顾高调制频率和大输出光功率两个指标,提出采用横向调制、组合调制等方法,开展铌酸锂晶体结构及参数优化、光耦合设计及功率计算、射频驱动源设计、自动偏置设计等关键技术分析,设计了一个最高调制频率达1238MHz,输出光功率大于1W的激光调制器,其半波电压约266V,调制深度约1.39rad,折减系数约0.99,消光比约20dB。实验证明,激光调制器的设计指标和实验结果基本相符,成功地应用于误码率优于10-9,链路距离大于7km的空间光通信地面演示验证实验中,具有应用于临近空间、深空光通信的可行性。
The modulation frequency and output optical power of laser modulator in space optical communication directly affect the optical communication speed and link distance. In order to balance the high modulation frequency and the large output optical power, the methods of lateral modulation and combination modulation are proposed to carry out the structure and parameter optimization of lithium niobate, optical coupling design and power calculation, RF driving source design, automatic bias design A laser modulator with a maximum modulation frequency of 1238MHz and an output optical power of more than 1W is designed. The half-wave voltage is about 266V, the modulation depth is about 1.39rad, the reduction factor is about 0.99, and the extinction ratio is about 20dB. Experiments show that the design of laser modulator basically agrees with the experimental results and is successfully applied in the field demonstration experiments of space optical communication with bit error rate better than 10-9 and link distance more than 7km. Feasibility of space optical communication.