Abstract
Free space optical (FSO) also known as free space photonics (FSS) is a technology widely deployed in Local Area Network (LAN), Metro Area Network (MAN), and in Inter & Intra chip communications. However satellite to satellite and other space use of FSO requires further consideration. Although FSO is highly beneficial due to its easy deployment and high security in narrow beam as well as market demand for 10 GB+, some factors especially rain, snow and fog attenuation causes signal integrity problem in FSO. To get better Signal Integrity in FSO we need to consider all components while designing the system. In this paper a comparative analysis has been performed on 10 GB and 40 GB FSO system over 1 Km. Firstly for selecting suitable modulation technique we compared NRZ and RZ modulation and get spectrum analysis. NRZ modulation was found more data efficient. Signal Integrity in FSO system with 10 GB/s was analyzed by eye diagram and Q-Factor of both APD and PIN Photo detector was presented in graph. Same experiment was repeated with 40 GB/s and Bit error rate of both photo detectors were presented.
Highlights
Free space optical (FSO) is a transmission system which provide point to point, mesh and point to multi point communication by using laser and photodiodes
Photo Intrinsic Negative (PIN) and Avalanche Photo Diode (APD) are two photo detectors use in Free space Optic
Due to high Q-factor we enabled thermal noise in our system
Summary
Free space optical (FSO) is a transmission system which provide point to point, mesh and point to multi point communication by using laser and photodiodes. It can be a good candidate for high bandwidth future broadband and communication systems. Snowfall and FOG are big challenges and they need researcher’s consideration to maintain signal integrity in FSO system as the data-rate and coverage distance increases. In this paper we design a simple point to point FSO system in OpticSystem 14.0 and check signal integrity by PIN & APD photodiode in different weather conditions with 10 GB/s and 40 GB/s data rate over 1 Km
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