Countries to work on the development of laser communication continue to join, wonder of optical communication technology is bound to have a greater improvement and development, especially in complex radio frequency, electronic jamming growing environment, optical communication is very important. Therefore, laser communications research and development, increase the communication distance, all-day mobile communications, electronic warfare and communications is need for confrontation, is the future trend of development. Laser based on the original atmosphere, should focus on developing the following aspects: development of atmospheric laser communication technologies research.
Figure 3 is the optical signal receiver circuit diagram, which is a silicon photodiode SPD, its peak response wavelength and the transmission LED light source is very close to the center wavelength, the peak wavelength responsivity 0.25-0.5μA/μW. SPD’s task is to come through the optical transmission of optical signals into optical power is proportional with the light current I0, and then through IC2 form IV conversion circuit, then optical flow into the output voltage V0. The warehouse of green laser pointer still has large space to store more laser pointer pen.
Security advantages. Good directional laser to transmit data with a high degree of confidentiality, the laser beam divergence angle in the sub-mrad are usually orders of magnitude, unless the communication link is truncated or the information is difficult to be intercepted. Size advantage. As the light wave length (about 0.2 microns to a few tens of microns), in the case of providing the same gain, the antenna size than the microwave, millimeter-wave communication antenna size is much smaller. Power advantage. As the laser highly directional, so the smaller the power source can be realized only communication, communication terminal low power consumption, easy-to-remote feed. The worker is carefully operating the machine of processing green laser pointer.
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