Hybrid Coarse and Dense WDM Over Fso Link Under the Effect of Moderate and Heavy Rain Weather Attenuations (original) (raw)
Related papers
In this paper, simulative analysis of 10Gbps DWDM system link with FSO channel using different modulation format under different weather condition has been performed. A 16×10 DWDM system has been analyzed with 1nm channel spacing and the effect of variation in input power and transmission distance is observed in terms of Q-factor values of received channels. From the study of variation in input power in the scenario of different weather condition (clear, haze, rain and fog) the best modulation format has been identified. It has been observed that DBNRZ modulation format is best result than other modulation formats. Similarly in the case of while varying link distance under different weather conditions, the best modulation format has been recognized. It has been observed that CSNRZ modulation format is better result than the other modulation formats. The BER performance of all received signals is also discussed.
IJEER , 2023
Free Space Optics (FSO) is a highly viable solution for high-speed wireless communication and is widely preferred over radio frequency communication systems because of its faster data transmission, no regulatory requirements and highly secure long-range operations. However, the capacity and availability of FSO optical bands are a significant concern in varying atmospheric conditions. Our objective is to enhance network flexibility and expand wireless network coverage in adverse weather conditions by combining optical and FSO links using optical bands C, S, and O. The study analyzed the performance of a hybrid 4 channels FSO-WDM system with a 100GHz or 0.8 nm channel spacing under different conditions, including adverse weather and varying data rates. An attenuation of 0.25 dB/km was fixed, and the system's performance was analyzed up to 3 km. The results showed that as the data rate increased, the system's performance declined, and the O band was the best performer up to 25 Gbit/s. BER values were analyzed at different weather conditions using the Kim model, and the O band consistently outperformed the S and C bands. Eye diagrams were used to evaluate the signal quality, and the O band was shown to perform better than the other two bands, even in adverse weather conditions. Overall, the study suggests that FSO is a viable solution for high-speed wireless communication, particularly when using the O band.
Performance analysis of terrestrial WDM-FSO Link under Different Weather Channel
2016
In this paper, the performance of WDM-FSO communications system is simulation analyzed, using NRZ modulation technique over different weather conditions. Based on this technique the received signal power, signal to noise ratio, Q. factor, and BER are analyzed. The characteristics of WDM was studied for free space optical communication. Simulation results indicate that the performance of WDM-FSO are more suited for strong attenuation. On the other hand, the suitability of distance link under this technique are studied, where WDM has more advantage when used in optical communication system.
Performance Investigation of FSO–OFDM Communication Systems under the Heavy Rain Weather
Journal of Optical Communications, 2016
The challenge in the free-space optical (FSO) communication is the propagation of optical signal through different atmospheric conditions such as rain, snow and fog. In this paper, an orthogonal frequency-division multiplexing technique (OFDM) is proposed in the FSO communication system. Meanwhile, considering the rain attenuation models based on Marshal & Palmer and Carbonneau models, the performance of FSO communication system based on the OFDM is evaluated under the heavy-rain condition in Changsha, China. The simulation results show that, under a heavy-rainfall condition of 106.18 mm/h, with an attenuation factor of 7 dB/km based on the Marshal & Palmer model, the bit rate of 2.5 and 4.0 Gbps data can be transmitted over the FSO channels of 1.6 and 1.3 km, respectively, and the bit error rate of less than 1E − 4 can be achieved. In addition, the effect on rain attenuation over the FSO communication system based on the Marshal & Palmer model is less than that of the Carbonneau mo...
IJERT-WDM based FSO System for Long Haul Communication
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/wdm-based-fso-system-for-long-haul-communication https://www.ijert.org/research/wdm-based-fso-system-for-long-haul-communication-IJERTV4IS040981.pdf Today's demand is a communication link with good performance and minimum errors. Free Space Optics (FSO) is one of the growing fields of optical communication because of its wider bandwidth, high security and easy installation. FSO system is license free, easily deployable and provides high data rate. However the performance of FSO system is affected by turbulent atmosphere. In this paper, the performance of Wavelength Division Multiplexing (WDM) based FSO system has been tested for different weather conditions such as clear weather, light haze, heavy haze, light rain, medium rain and heavy rain based on Bit Error Rate (BER) and communication link range using Optisystem software. Experimental results show that a WDM based FSO system can transmit an optical signal of 2.5Gbps with 1550nm wavelength up to 155km at clear weather condition with BER of 10-12 .
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/performance-analysis-of-free-space-optical-communication-under-the-effect-of-rain-in-arusha-region-tanzania https://www.ijert.org/research/performance-analysis-of-free-space-optical-communication-under-the-effect-of-rain-in-arusha-region-tanzania-IJERTV3IS090574.pdf Free Space Optical (FSO) is an optical communication technology that uses light propagating in free space to transmit data between two points. Arusha being a tourist city the demand for higher and unlimited bandwidth for communication channel is highly required. For this case the communication through FSO is the best alternative solution than optical fiber. In this paper we are proposing the use of FSO communication by presenting different parameters to be used in Arusha when transmitting data during the heavy rain period months, especially April and November. We designed a model of FSO system using OptiSystem to establish an FSO link by a range of 3, 7,11,15,18, and 20 km. In the FSO link we have used a Marshal & Palmer model as rain attenuation model, while transmitting the data on NRZ modulation scheme, and reported analysis of various parameters like transmission power, Bit Error rate (BER),and transmission length. The simulation results shows, for better transmission of data during the heavy rain seasons of the mentioned months above, the transmitting power of 30dBm should be used. This power can be implemented within 7 to 17km of the FSO links with an acceptable BER of less than 1. Also for the transmission links of less than 5km and less than 10km, a transmission power of 10dBm and 20dBm can be used respectively. The analysis also found that using FSO for communication is better than optical fiber because it can avoid some challenges such as high cost of digging roads, impractical physical connection between transmitters and receivers and insecure of data.