| Title |
Numerical Study on the Wireless Communication at 550[nm], 850[nm] and 1550[nm] Wavelength LD in Fog and Pointing Error using Cassegrain Optics |
| Keywords |
Cassegrain Optics ; LD ; APD ; Antenna Gain ; SNR ; BER |
| Abstract |
Atmospheric effects on laser beam propagation can be broken down into two categories: attenuation of the laser power and fluctuation of laser power due to laser beam defomation. Attenuation consists of scattering of the laser light photons by the fog. Laser beam deformation occurs because of small-scale dynamic changes in the index of refraction of the atmosphere. This causes pointing error. In order to analyse these effect on optical wireless communication system, in this paper uses cassegrain optics as a transmitting and receiving telescope, APD as a detecting device and LD as a light source. The signal modulating and demodulating method is a IM/DD. I show the effects of fog and pointing error and calculate the possible communication distance for BER is 10-9. |