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提出采用两个光相位调制器组成一个电-光偏振调制器实现双信道偏振位移键控(PolSK)光通信系统方案,并进行了仿真验证。分析了系统的工作原理,给出了关键点的信号的琼斯矢量和星座图,并通过系统仿真计算出了偏振接收、解复用后的双信道数据信号的时间波形。该系统在发射机端,采用平行相位调制方式实现了双信道数据的复用,在接收机端,采用直接偏振接收检测方式实现了PolSK信号的解复用。仿真结果表明:该系统具有很好的双信道数据的偏振复用和解复用性能,能够同时传输两组相同码率或不相同码率以及不同时钟的数据信号。与其他类型PolSK光通信系统相比,接收光信噪比提高了1 dB。
A scheme of two-channel Polarization Shift Keying (PolSK) optical communication system using two optical phase modulators to form an electro-optical polarization modulator is proposed and simulated. The working principle of the system is analyzed. The Jones vector and constellation of the signal at the key point are given. The time waveform of the double channel data signal after polarization reception and demultiplexing is calculated through the system simulation. The system at the transmitter side, the use of parallel phase modulation to achieve dual-channel data multiplexing, the receiver side, using direct polarization detection method to achieve PolSK signal demultiplexing. The simulation results show that the system has good polarization multiplexing and demultiplexing performance of dual-channel data, and can simultaneously transmit two data signals of the same or different code rates and different clocks. Compared with other types of PolSK optical communication system, the received optical signal to noise ratio increased by 1 dB.