- 标题
- 摘要
- 关键词
- 实验方案
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Evaluation of Chirped Fiber Bragg Grating with APD on Designed Optical Fiber Communication Link
摘要： Application of fiber Bragg grating (FBG) in optical communication is an evolving field. In this research paper, various types of chirped FBG’s (CFBG) have been used with avalanche photodiode (APD) on the designed optical fiber communication (OFC) link. Data rate of 20 Gbps and return-to-zero modulation format has been kept as fixed parameters. The designed link has been evaluated for varying fiber lengths (100, 200, 300, 400 and 500 km), various type of CFBG’s (linear, quadratic, square root and cubic root) with Gaussian apodization function, varying grating lengths (10, 20, 30, 40 and 50 mm) and operating temperatures (5°C, 10°C, 15°C, 20°C, 25°C, 30°C). The designed OFC link has also been evaluated for APD with and without CFBG. The performance evaluation matrix parameters selected are Q-factor, bit error rate and eye diagram. The OFC link employing CFBG with APD has been found to be superior. In compensating chromatic dispersion, optimum results have been observed for linear CFBG with Gaussian apodization function in comparison to other types of CFBG with 50 mm grating length for the maximum transmission distance.
关键词： bit error rate (BER),Optical fiber communication (OFC),eye diagram,chirped fiber Bragg grating (CFBG),vertical cavity surface emitting laser (VCSEL),avalanche photodiode (APD),Q-factor
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE Asia Pacific Conference on Wireless and Mobile (APWiMob) - BALI, Indonesia (2019.11.5-2019.11.7)] 2019 IEEE Asia Pacific Conference on Wireless and Mobile (APWiMob) - Performance of LED Overlap in Visible Light Communication System
摘要： In this paper, we consider an indoor Visible Light Communication (VLC) system with a placement technique with and without an overlap formed, using four and five Light Emitting Diodes (LED), placements on a room roof. To support the better received signal power, this paper evaluated the performance of LED overlap using the 3-Watt transmit power. We did a computer simulation using the dimension closed communication 5x5x3 m3. In this paper, we found that the VLC system with an overlap was better than the one without an overlap. The result showed that the received power could reach the minimum Bit Error Rate (BER) threshold around -18 dBm for VLC system without an overlap and -20 dBm for VLC system with an overlap. From the simulation, it obtained that communication link coverage with an overlap was about 25 m2.
关键词： Overlap,Bit Error Rate,Coverage,Visible Light Communication
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Computational Intelligence and Knowledge Economy (ICCIKE) - Dubai, United Arab Emirates (2019.12.11-2019.12.12)] 2019 International Conference on Computational Intelligence and Knowledge Economy (ICCIKE) - Optimized FWM Parameters for FTTH Using DWDM Network
摘要： A DWDM System consisting of transmitter, optical span and receiver is designed. The line coding technique NRZ (Non Return To Zero) has been used as the modulation schemes. The variation in the four wave mixing is analyzed with respect to the designed DWDM (Dense Wavelength Division Multiplexing) system. The DWDM is designed and simulated on Optisystem and their BER (Bit Error Rate) is calculated. The DWDM system is implemented in a FTTH (Fiber To The Home) system and simulated on Optisystem and their BER is calculated.
关键词： DWDM,Bit Error Rate,OptiSystem,FTTH,Four Wave Mixing,Simulation
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) - Istanbul, Turkey (2019.9.8-2019.9.11)] 2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) - Transmit Laser Selection for Underwater Visible Light Communication Systems
摘要： Visible light communication (VLC) has the potential to serve as a high-speed underwater wireless connectivity solution to support real-time image and video transmission. Underwater propagation medium imposes additional challenges on the design of VLC systems which were originally proposed for indoor applications. Temperature and salinity fluctuations result in fluctuations of the refractive index of seawater and eventually introduce turbulence-induced fading. In this paper, to mitigate the effects of fading, we propose transmit laser selection for a diver-to-diver underwater VLC link where the transmitter has multiple laser sources and the receiver has one photodetector. The source with the highest received instantaneous signal-to-noise ratio is selected for transmission while the remaining sources remain idle. We derive a closed-form expression for asymptotical bit error rate over log-normal distributed underwater turbulence channels and derive the achievable diversity order. We further present simulation results to confirm our derivations and diversity gain analysis.
关键词： bit error rate performance,underwater optical turbulence,transmit laser selection,diversity order,Underwater visible light communication
更新于2025-09-16 10:30:52
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Crosstalk Limitations due to Intercore Coupling on the BER Performance of an Optical Communication System with Homogeneous Multi-core Fiber
摘要： The effect of crosstalk due to inter-core coupling on the bit error rate (BER) performance of a fiber optic communication link with a homogeneous multi-core optical fiber (MCF) and a direct detection receiver with optical preamplifier is analytically evaluated and presented in this paper. Coupling coefficients due to inter-core coupling in a 7-core MCF is evaluated numerically with as a function of core-to-core distance (pitch) and relative refractive index contrast. Coupling length is determined against various index contrasts and at different core pitches. Crosstalk power, Signal to Crosstalk plus Noise Ratio (SCNR), BER and power penalty at any output core with light launched into other core of a 7-core MCF are determined analytically. The results show that there is mentionable deterioration in BER performance due to coupling induced crosstalk, and system suffers distinct power penalty at a given BER. For example, power penalty at BER of 10e-9 is found to be 4.0 dB and 4.3 dB for a MCF link of 10 km corresponding to relative refractive index difference of 0.0036 and 0.0030, respectively, for a pitch value of 30 μm and core radius of 4.5 μm.
关键词： Bit Error Rate,coupling length,mode coupling,coupling coefficient,multi-core fiber,crosstalk
更新于2025-09-16 10:30:52
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Bit Error Rate Analysis for Modulating Retro-reflector Free Space Optical Communications with Adaptive Threshold over Correlated Gamma Gamma Fading Channels
摘要： Bit error rate (BER) performance for modulating retro-re?ector (MRR) free space optical communication (FSOC) system with an adaptive threshold over correlated gamma-gamma fading channel is investigated. In order to do this analysis, we ?rst derive two closed form expressions for the probability density function of the correlated MRR channel and our instantaneous BER using the optimal adaptive threshold without channel state information (CSI). Then based on these results, we develop a closed form expression for the average BER in the in?nite series form whose convergence is con?rmed by Cauchy’s ratio test. Simulation results show that we can achieve small SNR penalty of 0.32 dB between our system and the system with CSI by constructing our adaptive threshold using 3 bit pilot data corresponding to a slight throughput reduction.
关键词： Modulating retro-re?ector,Adaptive threshold,Bit error rate performance,Free space optical communication
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - A Mathematical Expression of Bit Error Rate of PCM-FM using Non-coherent Detection
摘要： there telemetry. However, PCM/FM, also known as CPFSK, is widely used in aeronautical theoretical expression of its bit error rate in the literature. In this paper, based on the analysis of non-coherent detection of PCM/FM signal, a mathematical expression is derived. The analytical result is verified by computer simulation and compared with other modulation schemes and the proposed expression can significantly benefit the system design and evaluation of receiver performance.
关键词： bit error rate,CPFSK,telemetry,PCM/FM,demodulation
更新于2025-09-16 10:30:52
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Generalised statistical distribution for turbulence-induced fading in wireless optical communication systems
摘要： The unified M distribution is recently proposed for analysing turbulence-induced fading effects in wireless optical communication (WOC) systems. In developing this model, the large-scale fluctuations have been approximated by gamma distribution, instead of widely accepted log-normal distribution. However, the accuracy of this approximation decreases when the variance of the log-normal distribution is large. As another approach, the inverse-Gaussian (IG) distribution has been proposed in the literature to model the large-scale fluctuation, results in a new accurate, closed-form distribution termed as S model. To generalise the above results, in this study, the authors propose to approximate the large-scale fluctuations by generalised IG distribution. They show that this new approach results in an accurate, closed-form generalised distribution, called here as H model which includes M and S models as its special cases. To show the applicability of the presented model, they consider a WOC system with heterodyne detection scheme and investigate its bit error rate (BER) performance over H-distributed fading channel. They derive closed-form analytical expression for the BER of the considered system and show that in a special case, it coincides with the results presented in the open technical literature.
关键词： bit error rate,M distribution,turbulence-induced fading,wireless optical communication,H model,inverse-Gaussian distribution
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Vision Towards Emerging Trends in Communication and Networking (ViTECoN) - Vellore, India (2019.3.30-2019.3.31)] 2019 International Conference on Vision Towards Emerging Trends in Communication and Networking (ViTECoN) - Modeling and Analysis of Hybrid SIM with L-PPM and MSK over Double Generalized Gamma Distribution in Free Space Optical Communication System
摘要： In this paper, we use Double Generalized Gamma (GG) distribution in turbulence induced fading to model the communication channel under weak, moderate and strong turbulence condition. In order to further improve the performance of Free Space Optical (FSO) Communication system over Double GG distribution, we use Hybrid Subcarrier Intensity Modulation (SIM) with L-Pulse Position Modulation (L-PPM) and Minimum Shift Keying (MSK) and analyze its Bit Error Rate (BER) performance for average received irradiance between -12 dBm and 4 dBm. From the simulation results, we observe that BER decreases with decrease in average length of PPM symbol L under different turbulence conditions in FSO Communication system.
关键词： FSO Communication System,Subcarrier Intensity Modulation,Atmospheric Turbulence,Bit Error Rate,Average Irradiance
更新于2025-09-12 10:27:22
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Exact distributions for bit error rate and channel capacity in free-space optical communication
摘要： Bit error rate (BER) and channel capacity are two important metrics to assess the performance of free-space optical communication (FSOC) systems. Due to the fading of the optical signal owing to the atmospheric effects, these two quantities behave as random variables. Most of the studies in this direction have focused on the calculation of only the average of these quantities. However, since the complete information about a random variable is encoded in its distribution, it is more informative to examine the latter itself. In this work, the authors derive exact probability density function (PDF) expressions for the BER and the channel capacity for an arbitrary irradiance model. In particular, they investigate these exact results for log-normal, gamma-gamma, and K distributions. For the BER analysis, they focus on the binary phase shift keying and quadrature phase shift keying modulation schemes. The authors' analytical reults are found to be in conformity with Monte Carlo simulations. The exact PDFs of the BER and the channel capacity reveal that there are several instances when the average is unable to capture the actual behaviour of these quantities, and therefore one must be careful in drawing conclusions based on the first moment only.
关键词： binary phase shift keying,bit error rate,quadrature phase shift keying,gamma-gamma distribution,channel capacity,log-normal distribution,K distribution,probability density function,free-space optical communication
更新于2025-09-12 10:27:22