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برق و الکترونیک::
المان نوری
One considers using camera systems as receiver and the other one considers the usage of photoelements, generally photodiodes.
performances of such systems can be enhanced with optical systems that focus the light on the photoelement and improve the SNR.
For a VLC, these two sources are the most disturbing due to their high power, which can saturate the photoelement, making it blind.
It can be observed that the shot noise is proportional with the total detected optical power incident on the photoelement.
This circuit limits the bandwidth to 100 kHz according to eq. 5.2, and prevents the photoelement's saturation in case of direct exposure to high intensity light (e.g. sunlight).
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