It has proven that feedback can improve the performance of any communication systems. However, it is almost impossible to transmit too much feedback information or update the transmitter repeatedly. Limited-feedback mechanisms are promising solutions.
There are several studies regarding limited-feedback mechanisms in optical wireless communication as:
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8302445
https://ieeexplore.ieee.org/abstract/document/8292542
Conference Paper On Limited Feedback Resource Allocation for Visible Light Co...
Please let me know your opinion in this regard.
Dear Mohammad,
welcome,
The feed back from the receiver to the transmitter may be dedicated channel state information to notify the transmitter with the estimated signal to the channel transmission coefficient. This information is utilized by the transmitter to adjust its transmission parameters or to make prechannel equalization. Also a channel test signal can be sent from the receiver for the transmitter to assess the channel.
The training sequence and channel estimation periodically is an important technique fro improving the transmission in the advanced wireless communications.
This is a physical layer feed back. There is also the automatic repeat request protocol for error correction in system which can be considered also a kind of feedback fro the receiver to the transmitter.
Best wishes
A laser is an optical system relying at its core on feedback. Light Amplification by Stimulated Emitted Radiation. Read again the wikipedia article on laser. A laser has "feedback inside", it's a huge field of optic not to be overlooked
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