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NOISE-FREE MEASUREMENT OF THE SPECTRAL SHAPE OF A MODULATED SIGNAL USING SPECTRAL CORRELATION
NOISE-FREE MEASUREMENT OF THE SPECTRAL SHAPE OF A MODULATED SIGNAL USING SPECTRAL CORRELATION
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机译：利用谱相关性对调制信号的谱形状进行无噪声测量
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摘要
Method and systems for characterizing an optical signal propagating along a communication link are disclosed. The signal includes a data-carrying signal contribution, modulated at a symbol frequency, and a noise contribution. The method includes measuring an optical power spectrum of the signal, which includes a data-carrying signal spectrum component and a noise spectrum component. The method also includes determining a measured spectral correlation function within pairs of spectral components of the signal as a function of center frequency of the pairs, the spectral components in each pair being spectrally separated from each other by the symbol frequency. The method further includes obtaining a solution for the data-carrying signal spectrum component based on the measured optical power spectrum, such that a calculated spectral correlation function based on the solution matches the measured spectral correlation function. In some embodiments, the spectral correlation function is measured as a low-frequency beatnote amplitude function.
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