A real optical frequency comb spans the entire visible spectrum of light, and has very fine, evenly spaced teeth.

实际光学频率梳横跨整个可见光谱，各齿极细并均匀分布。

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They suggest that any alien civilisation worth its salt would alight not on the photons of the electromagnetic spectrum-whether optical or radio-frequency-to send messages to other solar systems.

他们指出，任何有头脑的外星文明都不会发射电磁波谱中的光子——无论是可见光波段还是射频波段——向另一个太阳系传送信息。

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A lot of grating messages including its profile can be derived from diffraction spectrum of grating according to Fourier optical theory.

根据傅立叶光学理论从光栅的衍射频谱中可以反推光栅本身的多种信息，包括其形貌特征。

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This means more cell towers, more small cells, more Wi-Fi, more advanced technology like LTE and MIMO, more spectrum, and more Ethernet optical fiber links connecting all these wireless and data center nodes.

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