A novel method for analyzing the performance of free space optical communication in WDM using EDFA (original) (raw)
Related papers
Analysis of EDFA in WDM Optical Network
In today's contemporary world Optical fiber communication has shown its dominance over all other conventional and traditional forms of communication. In particular, optical networks that apply wavelength division multiplexing (WDM) have taken over the telecommunication sector and are also growing in various other fields of communications. It is need of the hour and they will also prove their significance in next generation of communication era. They will also support a large variety of services having very different requirements in terms of bandwidth, latency, reliability and other features. The main purpose of this paper is to create a simulation of WDM optical network with parameters being the length of the optical fiber and the pump power supplied by the pump laser. The whole system is simulated using OptiSystem 10.0 software. In the whole process pump power and length of the optical fiber are optimized so that we can achieve gain flatness, low BER (Bit error rate), and low noise figure of EDFA (Erbium doped fiber amplifier) .
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.
EDFA-WDM Optical Network Design System
Procedia Engineering, 2013
Optical network that apply wavelength division multiplexing (WDM) is currently widely used in existing telecommunications infrastructures and is expected to play a significant role in next generation networks and the future Internet supporting a large variety of services having very different requirements in terms of bandwidth, latency, reliability and other features. The purpose of this paper is to design a simulation of WDM Optical Network in terms of length and pump power. The system is simulated using Optisystem software to achieve gain flatness, BER (Bit error rate), and noise figure of EDFA through optimized fiber length and pump power. The gains are flattened within 38±0.5dB from 1546nm to 1558nm band of wavelength with bit error rate (BER) < 10 -4 and noise figure (NF) <9dB for 16-channels simultaneous amplification in a single stage EDFA. The results obtain from simulation are compared with the result from the previous journal.
Performance of digital optical communication link effect of in-line EDFA parameters
The performance of a base band digital optical communication link with in-line Erbium doped fiber amplifier (EDFA) is studied. A good measure for digital communication link is the Q-factor. In this paper, the Q-factor is theoretically evaluated as a function of optical signal to noise ratio (SNR opt ) and is compared with simulation results showing a fair agreement. This comparison helps in making an accurate prediction for the value of Q-factor when all noise sources are considered. Also, the effect of Erbium ion density and doped fiber length of EDFA on bit error probability is investigated.
TO ANALYSE THE PARAMETER OF COARSE WAVELENGTH DIVISION MULTIPLEXING BY USING EDFA
It is difficult in optical communication systems to predict the final signal at the receiver side because of using various components. In this current work, Opti-system 7th version software is used to analyze the four channels of coarse wavelength division multiplexing (CWDM) with channel bandwidth 40Gb/s, 10Gb/s for each channel, from the transmitter to the receiver based on extinction ratio, pump power and the distance of the optical fiber until 100km and simulation helps to analyze the performance before any actual hardware is done. An Erbium-Doped Fiber Amplifier (EDFA) is used for amplification purpose for long distances. The result have to be found that the maximum Q factor and eye height decreased and minimum BER increased as the fiber length increase after simulation. When the extinction ratio increased, the eye height increased. Pump power effect the gain of the system. If the pump power increases then the gain also increase but no effect on maximum Q factor and minimum BER. KEYWORDS: Bit Error Rate (BER), Coarse Wavelength Division Multiplexing (CWDM), Erbium-Doped Fiber Amplifier (EDFA).
IJERT-An Effective 8×7.5 GBPS WDM Free Space Optical Communication System
International Journal of Engineering Research and Technology (IJERT), 2018
https://www.ijert.org/an-effective-87.5-gbps-wdm-free-space-optical-communication-system https://www.ijert.org/research/an-effective-87.5-gbps-wdm-free-space-optical-communication-system-IJERTCONV6IS08011.pdf [1] PG Student, [2] Associate Professor, [1][2] Department of ECE A.C.Government College of Engineering and Technology,Karaikudi-630003. Abstract:-This paper is created on free space optical communication system which contains eight users each of which has 7.5 Gbps bit rate. Most popular WDM method is integrated for data transmission. FSO communication has taken over the radio frequency communication and microwave systems due to its advantages like its high bandwidth, license free, high safety, efficient power transmission, less distortion and easily deployable as compared to all other wireless network. Results have been accomplished by the simulation which includes error free SNR and Q factor up to 1 km.
Analysis of Transmitting 40Gb/s CWDM Based on Extinction Value and Fiber Length Using EDFA
It is difficult in optical communication systems to predict the final signal at the customer side because of using various components and the effect of many features. Simulation helps to analyze and expect the performance before any actual hardware is done. In the proposed research, Optisystem 12 th version software is used in order to analyze transmitting 40Gb/s, 10Gb/s for each channel, in four channels of coarse wavelength division multiplexing (CWDM) from the transmitter to the receiver based on extinction ratio and the distance of the optical fiber until 100km. An Erbium-Doped Fiber Amplifier (EDFA) is used for long distances. The objective of the simulation is to certify that the received signals are not affected by the noise and attenuation so they are undamaged and in good condition by using bit error rate (BER) analyzer. From the simulation obtained, maximum Q factor, eye height, and threshold decreased as the fiber length increased, and as the value of the extinction ratio increased, the eye height increased but threshold decreased. The results of the CWDM are presented in this paper.
International Journal of Engineering & Technology, 2018
Free space optical (FSO) systems introduce the best solution for the broadband network requirements with a cost reduction compared to the optical wire communication systems. This paper studies the signal to noise ratio (SNR) and quality factor (Q-factor) for using two types of modulation formats and compares their performance. The analysis are performed for Mach-Zehnder modulator (MZM) and electro-absorption modulator (EAM) with distance range (1-4) km of FSO by using avalanche photo-diodes (APD) receivers. The simulation results are obtained based on the Optisystem 7.0 with optical high data rate of 10 Gbs for this communication system. The simulation results have shown that MZM gives better performance compared to EAM for different ranges and for the selected beam divergence value.
This thesis evaluates the potentials of a dense wavelength division multiplexing (DWDM) for free-space optical (FSO) communications access networks in providing a possible solution to an all-optical access network. In such network architectures, the FSO link can extend the system to areas where an optical fiber link is not feasible, and/or provide limited mobility for indoor coverage. Wavelength division multiplexing (WDM) is incorporated into the network for high-speed transmission and/or network scalability. The performance of the FSO communication system using DWDM in a turbulent atmosphere employing an on-off keying (OOK) and adaptive detection thresholds is proposed to extend the transmission distance. The design and analysis of 8-channels wavelength-division multiplexing (WDM) based FSO transmission system at 2.5 Gbps under different atmospheric conditions is investigated. Interchannel crosstalk and atmospheric turbulence are major impairments in such a system and could combine in some cases to degrade the system. Both impairments are investigated here and the results are presented in the form of bit-error-rate (BER), transmission distances, the required optical power, and electrical signal-to-noise ratios (SNRs). An electrical SNR optimized detection system is applied. The system uses the modified OOK to implement adaptive and electrical SNRs detection thresholds and eliminate the error floors. Numerical results show that the SNR gap between the electrical-SNR-optimized detection system and the adaptive detection system over a lognormal turbulence channel is 2.2 dB without a state offset ξ = 0 at a BER of 〖"10" 〗^(-"6" ) and 4.2 dB at a BER of 〖"10" 〗^(-"6" ) with a state offset ξ = 0.21. Free-space optical communication link using a digital pulse-position modulation (DPPM) in a wavelength-division-multiplexing system is proposed. Such a system has a high performance, low cost, robust and power-efficient, reliable, excessive flexibility, and higher data rate for access networks. Depending on the turbulence level, power penalties (PP) of about "0.2 dB"-"4.0 dB" for weak turbulence regimes, and above 25 dB for strong turbulence regimes are reported for BER of〖" 10" 〗^(-"9" ). The FSO link length that can be supported in the general case of the DWDM-FSO network for hybrid fiber is investigated. The results show that, for a clear atmosphere, FSO distribution link length up to 4 km can be reliably used (depending on turbulence strength) to achieve human eye safety and high capacity access networks. An improvement of about 2 dB can be achieved using the DPPM scheme over an equivalent of on-off keyed based FSO system. Further, we develop of improvement the PP caused by multiple-access interference about 6.686 dB which is predicted for target BER of〖" 10" 〗^(-"9" ) in weak turbulence and 1 dB at target BER of 〖"10" 〗^(-"6" ) in strong turbulence when the 8 users are active on the system of optical network units. Additionally, the optical power budget and margin losses of a system are calculated with different link lengths. Finally, we implement a new algorithm using Matlab programming to calculate and improve the performance of the power penalty and atmospheric turbulence channel.