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相干光通信链路属于天地一体化高速通讯网络节点连接的关键链路。着眼于外差效率表征大气湍流扰动之后信号光及本振光相干合成指标,从而推导非均匀湍流路径上外差效率理论表达式,充分结合大气折射率结构常数轮廓进行相干光通信链路外差效率仿真。目前,主流光通信系统均是运用幅度调值或是直接解调方式实现通信,也就是说将光看作载波,信号作光载波施以强度调制方式,接收端侧信道中所传递的光信号可直接展开包络解调,恢复发端信号以实现通信。此类系统接收灵敏度偏低,同时频带利用率不高,使得系统中继距离及传输容量非常有限。本文分析了相干光通信链路外差技术,并提出实用性应用策略。
Coherent optical communication links belong to the key link connecting nodes of high-speed integrated communications networks in the world. Focusing on the heterodyne efficiency characterization of the atmospheric light turbulence perturbation and the signal light and local light coherent synthesis index, thus deriving the heterogeneous turbulence path heterodyne efficiency theoretical expression, combined with atmospheric refractive index structure constant profile for coherent optical communication link heterodyne Efficiency simulation. At present, the mainstream optical communication systems all use amplitude modulation or direct demodulation to realize communication, that is to say, light is regarded as a carrier and the signal is imposed on the optical carrier by intensity modulation. The optical signal transmitted in the receiving side channel Envelope demodulation can be launched directly to restore the originating signal for communication. Such systems receive low sensitivity, while the band utilization is not high, making the system relay distance and transmission capacity is very limited. This paper analyzes the coherent optical communication link heterodyne technology, and put forward practical application strategy.