An effort to design a power efficient, long reach WDM-FSO system

Abstract

Free Space Optics offers many advantages over different communication systems like higher bandwidth, etc. FSO is being used to overcome the drawbacks of other systems like optical and radio communication systems. FSO requires free space as the medium of communication. Attenuation caused bythe medium can degrade a system performance. To overcome the effect of these losses due to attenuation, either the data rate is decreased or the laser power is increased. ] n this article, concept of laser power is analyzed by changing the power level and the performance is compared with that of system with constant power. It has been found that for higher attenuation, there is no significant decrease in link distance where as the power is reduced from 40dBm to IOdBm.

Simulative Investigation of Long- Range 32x3 Gbps WDM-FSO Link Under Different Weather Attenuation Conditions

“…From the results, it has been analyzed that by using SOA as amplifier, the system performs better in terms of bit error rate and quality factor with increased link distance as compared to [1] and [2].…”

“…In this paper, the work has been extended from work reported in [1], [2] by presenting less input power requirement, an improved bit error rate (BER) and Q factor by using efficient optical amplifier under worst weather condition. From the results, it has been analyzed that by using SOA as amplifier, the system performs better in terms of bit error rate and quality factor with increased link distance as compared to [1] and [2].…”

“…All these properties craft SOA a good choice for optical amplification [7] [8]. Laser power has plays important role in designing any system; so lesser this value, higher will be the quality of system [1].…”

“…Optical networks are high capacity networks that use a light as an electromagnetic carrier wave modulated to transmit data these systems offer excellent automatic powerlevel control, and eliminate short-distance optical saturation [1]. Free Space Optics (FSO) is a communication technology that uses light as carrier and free space as medium to transfer information between transmitter and receiver separated by certain distance.…”

Techniques to mitigate fading effect in FSO using OFDM

“…FSO is quite similar to that of optical fiber communication, the difference is that light beam is accumulated and sent through air/free space from transmitter to receiver rather than guided through fiber cables. In FSO, Line of sight (LOS) is strictly necessary for the successful transmission of data [3]. FSO fulfills the increasing demand of high data rate and provides 2 to 10 Gb/s speed depending upon the distance and weather conditions.…”