In the U.S.A it means you have the right of way but proceed with caution.
If you mean a gesture/action/sound to convey information then, Message, gesture or warning
signal
space .optical
"Signal" is the verb.
A fiber optical signal is based on the transfer of photons, while an electrical signal is based on the transfer of electrons.
electrical signal can be converted to an optical sigal by using a LED or SOA(semiconductor optical amplifier). LED is the cheaper option but have the drawback of larger linewidth. Typically used for LAN (local area network). SOA produces an optical signal mostly by direct modulation tecnique .
hi
Detector converts optical signal to electric signal
Optical signals (usually on the infrared band) optical s ignals generally mean visible light... so it mainly uses visible light.
Long Distance signal transmission!
yes
a continuously variable signal. it could be electronic, mechanical, hydraulic, optical, etc.
only over fiber
The retina detects light and the optical nerve sends the signal to the brain.
No. As long as the signal is getting through, the gauge of the optical connection makes no difference.
optical density is the amount of light