Abstract
In Free Space Optic (FSO) system free space requires as a communication media. Atmospheric attenuation due to communication media can degrade a system performance. To overcome this losses BER or Q-factor of a system are improved by using different type of photo-detector at receiver side & using optical receiver at link.. This paper describe the design and simulation of 16-channel WDM based Free Space Optical communication link under various Atmospheric conditions at different bit rates (5Gbps/10Gbps) using APD & PIN photo-detector & the performance of system using APD & PIN photo-detector is compared. The NRZ modulation format & semiconductor optical amplifier (SOA) is used in this design. In this simulation it observed that APD photo-detector at bit rate 5Gbps/10Gbpsgive better performance at higher attenuation.
Highlights
Free Space Optical Communication system is widely used a day’s due to its high Bit Rate, huge bandwidth and minimum bit error
In Free Space Optic (FSO) communication system electrical signal first converted into light form for this purpose Laser source is used which include LED’s and Laser diodes
[1] The photodetector is an essential element of any optical communication system which connected at receiver side as shown in “Fig.1”
Summary
Free Space Optical Communication system is widely used a day’s due to its high Bit Rate, huge bandwidth and minimum bit error. In FSO communication system electrical signal first converted into light form for this purpose Laser source is used which include LED’s and Laser diodes. On the other hand at receiver side optical-detector is used to covert light signal back into electrical form. There are two types of photo-detector used in FSO communication system as: I. When high reverse bias voltage is apply to APD it show an internal current gain effect. Where in PIN photo-detector current at output is proportional to light incident. CW array laser for transmission of light signal and forth is Mach-Zehnder modulator to modulate the data.[5] The basic transmitter section is shown in “Fig.2.”. At the receiver section: Photo-detector is used for conversion of light to electricity. The “Fig.2” show the receiver section of WDMFSO system
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