Performance Analysis of Free Space Optical Communication Link Using Different Modulation and Wavelength

In this paper different modulation formats NRZ and RZ and different wavelengths 1550 nm and 1310 nm and two photodiodes APD and PIN has been investigated on free space optical communication link. The value of Q has been observed in all the cases in different eye diagrams. It is clear from the observations that the Q value is highest when we use wavelength of 1550 nm, NRZ modulation format and APD photodiode. On the other hand it is lowest when the same wavelength is used with RZ modulation format along with PIN photodiodes.