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本文理论与模拟研究了双单边带离散多音频(Twin-SSB-DMT)信号经过全光波长变换实现多路传输系统。从理论方面研究双单边带信号的产生原理,并对转换光与原始信号光之间的关系展开分析。然后通过对推挽式调制器双臂射频信号的设置得到左单边带是DMT-4QAM、右单边带是DMT-16QAM的双单边带信号。20Gb/s双单边带信号经过SOA中四波混频效应产生了1-8路高质量的转换光,并且转换光携带原始信号光数据,可以实现高阶信号的多播传输。结果表明双单边带DMT信号在低成本下提高了频谱效率和波长带宽的利用率,整个全光波长变换系统的性能得到改善。此外,从星座图和误码率可以看出,8路偏振不敏感的多播信号都能够无串扰直接接收,信噪比代价低,进而可以实现高质量的多播系统。
In this paper, the theory and simulation of dual single-sideband discrete multi-tone (Twin-SSB-DMT) signal through all-optical wavelength conversion multiplexing transmission system. The principle of dual single-sideband signal generation is studied theoretically and the relationship between the converted signal and the original signal light is analyzed. Then by setting the dual-arm RF signal of the push-pull modulator, the left single sideband is DMT-4QAM and the right single sideband is the double sideband signal of DMT-16QAM. The 20Gb / s dual single-sideband signals produce 1-8 channels of high quality converted light through the four-wave mixing effect in the SOA, and the converted light carries the original signal light data for high-end signal multicast transmission. The results show that the single-sideband DMT signal improves the spectral efficiency and the utilization of the wavelength bandwidth at low cost, and the performance of the whole all-optical wavelength conversion system is improved. In addition, it can be seen from the constellation and bit error rate that all 8 polarization insensitive multicast signals can be directly received without crosstalk, and the signal-to-noise ratio is low, so that a high-quality multicast system can be realized.