空间光通信中高频率大功率激光调制器分析及设计  

High-Frequency and High-Power Laser Modulator in Space Optical Communications

作　　者：詹伟达[1,2] 李洪祚[1,2] 王志坚[1,3] 姜会林[1] 

机构地区：[1]长春理工大学空间光电技术研究所,吉林长春130022 [2]长春理工大学电子信息工程学院,吉林长春130022 [3]长春理工大学光电工程学院,吉林长春130022

出　　处：《激光与光电子学进展》2010年第12期26-33,共8页Laser & Optoelectronics Progress

基　　金：国家863计划(2008AA01Z225)资助课题

摘　　要：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 modulator frequency and output power directly affect the communication rate and link distance in the space optical communications.Considering two specifications of high modulation frequency and high output optical power,a method of adopting transverse modulation and combined modulation is proposed,and LiNbO3（LN） crystal structure and parameter optimization,optical coupling design and power calculation,RF-driven source design,technical analysis of automatic bias are carried out.A laser modulator is designed whose maximum modulation frequency is up to 1238 MHz,output optical power is greater than 1 W,half-wave voltage is about 266 V,maximum phase delay is about 1.39 rad,reduction factor is about 0.99,and extinction ratio is about 20 dB.Experiments show that the theoretical design is consistent with experimental results,and the laser modulator can be applied to the space optical communication demonstration experiments on the ground whose bit error rate is better than 10-9 and the link distance is more than 7 km.It can also be applied in the near space or deep space optical communications.

关 键 词：空间光通信 铌酸锂晶体 横向调制 组合调制 

分 类 号：TN929.13[电子电信—通信与信息系统]