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提出一个新颖的采用两个级联半导体光放大器(SOA)作为独立全光偏振调制器实现双信道偏振态位移键控(PolSK)光传输系统方案,并进行了实验验证。从发射机端输出的PolSK光信号具有四个偏振态,构成了两个独立的二进制数据信道。各信道数据可以采用不同的码制,码率以及不同的时钟信号。该系统方案,提高了通信系统的比特-符号比以及频谱利用率;又由于PolSK光信号功率恒定,减小了光纤链路中非线性效应对光信号的影响提高了通信系统长距离数据传输能力;在接收机端实现了光信号的直接偏振检测,简化了接收机的设计和成本;又由于采用了稳偏接收模块使接收系统能够实现稳定信号接收。构成了基于本方案的实验系统,进行了一系列基础实验和性能测试。分别进行了50 km,80 km以及100 km长距离光纤数据传输实验,实验结果表明所提出的系统方案是有效的。
A novel scheme of dual-channel Polarization-state Shift Keying (PolSK) optical transmission system using two cascaded semiconductor optical amplifiers (SOA) as independent PEMs is proposed and verified by experiments. The PolSK optical signal output from the transmitter has four polarization states and forms two independent binary data channels. The channel data can use different code system, code rate and different clock signals. The system scheme improves the bit-to-symbol ratio and the spectrum utilization ratio of the communication system, and reduces the influence of the non-linear effect on the optical signal due to the constant power of the PolSK optical signal and improves the long-distance data transmission capability of the communication system ; At the receiver to achieve direct optical signal polarization detection, simplifying the design and cost of the receiver; and because of the use of the stabilization module to receive the receiving system to achieve stable signal reception. Constitute the experimental system based on this program, conducted a series of basic experiments and performance testing. The experiments of 50 km, 80 km and 100 km long distance fiber data transmission are carried out respectively. The experimental results show that the proposed system is effective.