Abstract
We successfully demonstrate 40 GB/s 8 channels’ Dense Wavelength Division Multiplexing (DWDM) over free space optical (FSO) communication system. Each channel is transmitting 5 GB/s data rate in downstream separated by 0.8 nm (100 GHz) channel spacing with 1.8 GHz filter bandwidth. DWDM over FSO communication system is very effective in providing high data rate transmission with very low bit error rate (BER). The maximum reach of designed system is 4000 m without any compensation scheme. The simulation work reports minimum BER for Return-to-Zero (RZ) modulation format at different channels 1, 4, and 8 are found to be 2.32e-17, 1.70e-16, and 9.51e-15 at 4000 m distance, respectively. Sharp increase in BER occurs if data rate and distance increase up to 10 GB/s and 5000 m.
Highlights
Free space optical (FSO) communication, termed as optical wireless, is an optical communication technology that uses line of sight (LOS) communication system and tries to fulfill the need for high bandwidth over short distances [1]
It has been observed that if attenuation increases the loss of energy of received signal is more which results in sharp increase in bit error rate (BER)
Performance investigation on this designed WDM over FSO was carried out using RZ modulation with different parameters such as signal power, FSO transmitter and receiver diameter, beam divergence, attenuation, and distance
Summary
Free space optical (FSO) communication, termed as optical wireless, is an optical communication technology that uses line of sight (LOS) communication system and tries to fulfill the need for high bandwidth over short distances [1]. FSO channel affects the quality of signal due to atmospheric turbulence present, as FSO links are highly dependent on weather conditions. Many techniques have been proposed to improve the performance of FSO link like aperture averaging, diversity [7], or amplification of signal which can be done using optical amplifier [8]. WDM technique started a revolution in optical communication network due to the fact that capacity of system can be increased by increasing the number of channels and tightening the channel spacing without using more than one FSO link. Internal parameters include optical power, wavelength, and bandwidth; in recent years WDM over FSO communication system has become very efficient communication system in wireless communication system due to its high data rate, security, and minimum bit error rate (BER) [11].
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