The preferredoptical wavelength range for underwater optical communication is _________, so it is always called _______ .
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The two common types of white-light LED used in the visible light communication system are ________ and____________.
The two important problems for VLC considering the illumination constrains are ________ and____________.
The three basic transmission characteristics of theatmospheric opticalchannel are: ______________, ______________, ____________________.
Please presentthe three different categories for atmospheric scattering.