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. 2015 Sep 1;5:13649. doi: 10.1038/srep13649

Figure 1. The basic concept and principle.

Figure 1

(a) The time-frequency correspondence for sinc-shaped Nyquist pulses and the modulated Nyquist signals; (b) The principle of polarization-multiplexed all-optical Nyquist signal generation, modulation, multiplexing, fiber transmission and full-band coherent detection.