Engineering and Technology Journal

Abstract

The optical communication system consists of a transmitter uses a laser beam of
a wavelength 650 nm as a carrier in free space, and a receiver uses PIN diode as a
detector . In both sides Intensity modulation (IM) technique has been used to transmit
video signal of a frequency range (0~5) MHz band width. The video signal fed by
camera. The transmitted signal amplified and converted to a modulated intensity of
laser beam and sent to the receiver, the receiver converts the laser signal to a weak
electrical signal by the detector; the signal will be amplified and converted back to an
analogue signal to produce the original transmitted signal, and monitored by TV set in
(black and white ) . The transmission range was 5 m , that can be developed letter for
longer range.