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提出以改进型双二进制归零码(MD-RZ)信号作为标记,分别采用差分相移键控非归零码(NRZ-DPSK)信号和差分正交相移键控非归零码(NRZ-DQPSK)信号作为载荷进行正交调制的新方案.然后提出了一种从标记信号中提取和恢复时钟的简单方案.比较了背对背系统中2.5 Gbit/s的MD-RZ标记叠加到10 Gbit/s的NRZ-DPSK载荷和20 Gbit/s的NRZ-DQPSK载荷上的频谱特性,证明了MD-RZ标记占空比越大,光分组信号的频带利用率越高.采用传统的二进制强度调制-直接检测(IM-DD)系统的接收机检测得到了背对背系统中不同占空比的2.5 Gbit/s MD-RZ标记的眼图.结果表明,若采用色散补偿技术,两种光分组信号中的MD-RZ标记能够在长距离传输时克服接收端眼图的失真;当入纤功率值高于18 dBm时,占空比取值越大,MD-RZ标记的眼开度代价具有越高的传输鲁棒性.
In this paper, a modified double binary zeroing code (MD-RZ) signal is proposed as a marker, and the differential phase shift keying non-return to zero (NRZ-DPSK) signal and the differential quadrature phase shift keying non- DQPSK) signal as a quadrature modulation of the payload, a simple scheme of extracting and recovering the clock from the tagged signal is presented.Compared with 2.5Gbit / s MD-RZ tag in back-to-back system, the MD-RZ tag is superimposed to 10Gbit / s And the spectral characteristics of the NRZ-DQPSK payload at 20 Gbit / s, it is proved that the larger the duty cycle of the MD-RZ mark is, the higher the bandwidth utilization of the optical packet signal is.Using the traditional binary intensity modulation The eye of the 2.5 Gbit / s MD-RZ with different duty cycles in the back-to-back system was detected at the receiver of the IM-DD system. The results show that with the dispersion compensation technique, the MD -RZ mark can overcome the distortions of the receiving end eye diagram when transmitting over long distance; when the input power value is higher than 18 dBm, the larger the duty cycle value, the higher the eye opening cost of MD-RZ mark transmission Robustness.