scholarly journals Transmission Performance Analysis of WDM Radio over Fiber Technology for Next Generation Long-Haul Optical Networks

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Badiaa Ait Ahmed ◽  
Otman Aghzout ◽  
Mounia Chakkour ◽  
Fahd Chaoui ◽  
Azzeddin Naghar
Keyword(s):  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Impact Analysis ◽  
Transmission System ◽  
Radio Over Fiber ◽  
Signal Loss ◽  
Good Reliability ◽  
Differential Phase Shift ◽  
Fiber Technology ◽  
The Impact

This paper presents a detailed study of N-channels Wavelength Division Multiplexing (WDM) Optical transmission system using Radio over Fiber (RoF) technology. The study was applied to optical long-haul networks to overcome the nonlinearity effects, chromatic dispersion, and signal loss. For this purpose, Fiber Bragg Grating (FBG) has been implemented in 4-channels, 8-channels, and 16 channels WDM transmission system network at 10 Gb/s to compensate the dispersion and the nonlinear distortion. The use of erbium-doped fiber amplifiers (EDFA) has been also investigated to improve the quality of the transmission system. In Digital RoF, the impact analysis of modulation types such as Differential Phase-Shift Keying (DPSK) and Quadrature Amplitude Modulation (QAM) is also introduced. Constellation diagrams, received optical power, types of modulation, fiber dispersion, channel spacing variation, and laser power were considered to validate the study with the existing studies. All results achieve good reliability performance and prove the efficiency of the presented model.

scholarly journals Transmission (2Gbps) over optical fiber cable by using radio over fiber and wavelength division multiplexing techniques

2019 ◽  
Vol 24 (5) ◽  
pp. 115
Author(s):  
Humam Husseinˡ ◽  
Dogu Cagdas Atilla1 ◽  
Essa Essa2 ◽  
Cagatay Aydin1
Keyword(s):  
Optical Fiber ◽  
Wavelength Division Multiplexing ◽  
Performance Test ◽  
Optical Signal ◽  
Radio Over Fiber ◽  
Total Power ◽  
Q Factor ◽  
Wavelength Division ◽  
Fiber Technology ◽  
Optical Fiber Cable

In recent years, there has been a growing and continuous demand for great (data rates) beyond existing wired and wireless networks. Radio-over-Fiber technology is considered as an efficient and practical solution for providing broadband wireless. In this paper, many techniques are used to implement a system that has the capability to provide a great bit rate, broadband bandwidth, and minimum cost. So Radio-over-Fiber technology was used to modulate the light with radio-signal and transmission the signals through an optical fiber cable. Wavelength-Division-Multiplexing technique was used to send many signals through the same link, and Subcarrier Multiplexing-Amplitude Shift keying as a modulation format. 2Gpbs separate on two channels was transmitted on Single-Mode Fiber. The average results obtained from our experience was as follows: maximum Q factor average = 4.9712925, minimum BER average = 3.63*10-7, total power average (dBm) = -51.1502, the OSNR average (dB) = 52.085 for channel_1. The results of channel_2 were: maximum Q factor average = 5.5901325, minimum BER average = 1.26*10-8, total power average (dBm) = -46.60135, the average of optical signal-to-noise ratio (dB) = 54.65. All the average result that has from our simulation was very good and acceptable. The simulation and performance test of our experience was done using Optisystem 7.0.   http://dx.doi.org/10.25130/tjps.24.2019.100

Transmission Performance of 112 Gb/s POLMUX QPSK Signal in OOK/DPSK WDM System

2020 ◽  
Vol 41 (2) ◽  
pp. 171-176
Author(s):  
Harmanpreet Kaur Sandhu ◽  
R.S Kaler ◽  
Gurpreet Kaur ◽  
Rajneesh Randhawa
Keyword(s):  
Phase Shift ◽  
Wavelength Division Multiplexing ◽  
Phase Modulation ◽  
Optical Signal ◽  
Phase Shift Keying ◽  
Error Vector Magnitude ◽  
Differential Phase Shift ◽  
Wavelength Division ◽  
Shift Keying ◽  
The Impact

AbstractIn this article, the impact of cross-phase modulation (XPM) and cross-polarization modulation (XpolM) on transmission of 112 Gb/s polarization multiplexed quadrature phase shift keying (POLMUX QPSK) signal in a wavelength division multiplexing (WDM) system has been investigated. This WDM system comprises of on-off keying (OOK) or differential phase shift keying (DPSK) channels. It is observed that the effects of XPM and XpolM are greatly reduced in a hybrid system of co-propagating OOK and DPSK channels. This is due to the dominance of phase modulation of DPSK signals rather than the intensity modulated OOK signals. The error vector magnitude (EVM) of the received optical signal is evaluated for the increase in number of neighbouring OOK and DPSK channels respectively within a bandwidth of 350 GHz. Also, the effect of increase in bit rate for two neighbouring OOK and DPSK channels has been observed individually on the 112 Gb/s POLMUX QPSK signal. It is concluded that DPSK signals display an improvement of −9.44 dB in EVM over OOK signals when there are eight neighbouring channels in the transmission system.

scholarly journals An Optimal Framework for WDM Systems Using Analytical Characterization of Refractive Index-Related Nonlinear Impairments

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 221 ◽  
Author(s):  
Muhammad Irfan ◽  
Farman Ali ◽  
Fazal Muhammad ◽  
Abdullah S. Alwadie ◽  
Adam Glowacz ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
System Capacity ◽  
Limiting Factor ◽  
Transmission Range ◽  
Dispersion Parameters ◽  
Pass Filter ◽  
Low Pass Filter ◽  
The Impact

Nonlinear effects in the optical transmission systems (OTSs) are considered as the major performance limiting factor to provide high transmission rates over ultra-long distances. As the demands for system capacity, transmission range and the number of users is increasing exponentially with the development of mobile broadband, new challenges are being faced by the backbone optical networks. Mainly, the refractive index related non-linearities (RIrNLs) need to be characterized to design an optimal OTS for error-free transmission with provision of wavelength division multiplexing (WDM) to support for multiple channels. This paper provides an estimation technique of RIrNLs for long-haul transmission and their treatment for different channel spacing and the number of channels in a WDM system operating frequency domain multiple in multiple out (FD-MIMO) equalizer based digital signal processing (DSP) receiver and microstrip Chebyshev low pass filter. The main focus of this work is to utilize the existing structure of OTS for RIrNLs treatment with a low cost solution. Thus, by varying the parameters of the third order dispersion parameters, group velocity dispersion parameters, phase modulation dispersion and nonlinear refractive index, the impact of RIrNLs is investigated in detail to enhance the transmission range and capacity of the current OTS. The proposed system is analyzed in terms of range of input power, fiber length and received power for OTS figure of merits including bit error rate (BER) and optical signal-to-noise ratio (OSNR). Using duo-binary modulation, the BER achieved in this work is <10−5 till 500 km range, for maximum number of 32 channels, with 100 Gbps aggregate data rate, which shows the feasibility and effectiveness of our proposed model.

Effects of ASE on DPSK Modulation Formats with Different Duty-Ratio in Optical Transmission System

2013 ◽  
Vol 385-386 ◽  
pp. 1595-1598
Author(s):  
Jin Hang Hu ◽  
Ya Lin Guan ◽  
Jin Cai Lin
Keyword(s):  
Optical Networks ◽  
Optical Fiber Communication ◽  
Duty Ratio ◽  
Modulation Formats ◽  
Differential Phase Shift ◽  
Fiber Communication ◽  
Error Ratio ◽  
Bit Error Ratio ◽  
Shift Keying ◽  
The Impact

In optical networks, erbium-doped fiber amplifiers (EDFAs) are used to provide a wide and flat gain spectrum. Amplified Spontaneous Emission (ASE) emitted from EDFA adds to signal and grows rapidly. This accumulated ASE noise may limit the effective amplification due to saturation effect and affects the receivers bit error ratio (BER). In this paper, we show the impact of ASE noise in transmission fiber by using three different modulation formats: 33%DPSK, 66%DPSK and DPSK. In recent years, optical fiber communication system began to use the DPSK (Differential Phase Shift Keying) format to replace the traditional OOK format, which has been intensively investigated in numerical and experimental works.

Comparative Simulation of Thermal Noise Effects for Photodetectors on Performance of Long-Haul DWDM Optical Networks

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
I. S. Amiri ◽  
Fatma Mohammed Aref Mahmoud Houssien ◽  
Ahmed Nabih Zaki Rashed ◽  
Abd El-Naser A. Mohammed
Keyword(s):  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Thermal Noise ◽  
Signal To Noise Ratio ◽  
Avalanche Photodiode ◽  
Input Power ◽  
Superior Performance ◽  
Noise Effects ◽  
Wavelength Division ◽  
The Impact

AbstractLong-haul 16-channel dense-wavelength division multiplexing networks employing two different avalanche photodiode (APD) structures (Si and InGaAs) and positive-intrinsic-negative (PIN) photodetectors are simulated and compared under thermal noise effects for different fiber lengths. The effect of thermal noise level on the transmission quality with a variation of amplifying section length, number of amplifying sections and channel speed is discussed. The impact of thermal noise on the system performance is analyzed by varying input power from −5dBm to 20dBm for both 25 km and 50 km amplifying section at 100 km fiber length. The performance is evaluated for both 5 Gb/s and 10 Gb/s data rates over transmission distances up to 500 km. A comprehensive comparison is developed based on signal-to-noise ratio (SNR), quality factor (Q-factor) and bit error rate (BER). It is found that both APD structures achieve superior performance up to distance of 350 km comparing to PIN photodetectors for 50 km amplifying section. The system provides optimum performance at input power Pin = 10dBm in case of 50 km amplifying section, but then afterwards, the performance is degraded rapidly due to nonlinearities. The results revealed that the worst performance scenario is at 10–18 W/Hz thermal noise in terms of higher BER and lower Q-factor. Finally, the desirable BER of 10–12 is achieved at Q-factor of 6.78 and SNR of 23 dB.

scholarly journals PERFORMANCE ANALYSIS OF WSXC AND WIXC SSM OXC IN WDM OPTICAL NETWORKS

2014 ◽  
pp. 7-11
Author(s):  
MD. ISHTIAQUE AZIZ ZAHED ◽  
MD. SHAH AFRAN
Keyword(s):  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Wavelength Conversion ◽  
Optical Network ◽  
Propagation Delay ◽  
Optical Signal ◽  
Wdm Optical Networks ◽  
Power Penalty ◽  
Time Duration ◽  
The Impact

The impact of inband crosstalk on an optical signal passing through optical cross-connect nodes (OXC’s) in wavelength division multiplexing (WDM) optical network, is studied from the equation of electric field with crosstalk and the corresponding current. The analysis has been done for two SSM (space switching matrix) OXC architecture namely WSXC & WIXC where later one has full wavelength conversion capability. Although WIXC attenuates more crosstalk though it is found that depending on the values of optical propagation delay differences, coherent time of lasers and time duration of one bit of the signal, the required power penalty in WIXC may be greater than that of WSXC in some cases. The analysis has been performed on the measures of Bit Error Rate (BER) and Power Penalty.

scholarly journals Polarization Division Multiplexing of OFDM Radio-over-Fiber Signals in Passive Optical Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Maria Morant ◽  
Joaquin Pérez ◽  
Roberto Llorente
Keyword(s):  
Optical Networks ◽  
Spectral Efficiency ◽  
Optical Network ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Radio Over Fiber ◽  
Passive Optical Network ◽  
Passive Optical Networks ◽  
The Impact ◽  
Polarization Division Multiplexing

This paper describes the state-of-the-art of polarization multiplexing for optical networks transmission. The use of polarization division multiplexing (PDM) permits to multiply the user capacity and increase the spectral efficiency. Combining PDM and orthogonal frequency division multiplexed (OFDM) modulation allows maximizing the optical transmission capacity. The experimental demonstration of transmitting OFDM signals following ECMA-368 ultrawide band (UWB) standard in radio-over-fiber using PDM in passive optical networks is herein reported. The impact of cross-polarization and cochannel crosstalk is evaluated experimentally in a three-user OFDM-UWB subcarrier multiplexed (SCM) configuration per polarization. Each SCM uses up to three OFDM-UWB channels of 200 Mbit/s each, achieving an aggregated bitrate of 1.2 Gbit/s with 0.76 bit/s/Hz spectral efficiency when using PDM transmission. The experimental results for the polarization-multiplexed SCM indicate that a 4 dB additional polarization crosstalk interference can be expected compared to a nonpolarization-multiplexed transmission system which translates to 2.4 dB EVM penalty in the UWB signals. The successful PDM transmission of SCM multiuser OFDM-UWB over a passive optical network of 25 km standard-single mode fiber (SSMF) reach is demonstrated.

scholarly journals Comparison of Different Modulation Formats and their Compatibility with WDM Transmission System

2008 ◽  
Vol 45 (2) ◽  
pp. 3-16
Author(s):  
V. Bobrovs ◽  
G. Ivanovs
Keyword(s):  
Wavelength Division Multiplexing ◽  
Dispersion Compensation ◽  
Chromatic Dispersion ◽  
Polarization Mode Dispersion ◽  
Transmission System ◽  
Simulation Software ◽  
Wdm Networks ◽  
Modulation Formats ◽  
Differential Phase Shift ◽  
Wdm Transmission

Comparison of Different Modulation Formats and their Compatibility with WDM Transmission SystemIn the work, the intensity and phase modulation methods are compared for different versions of the wavelength division multiplexing (WDM) system. Binary and multilevel code formats are evaluated numerically, with OptSim simulation software at the bit rate of 10 and 40 Gbit/s, using long-fiber spans and dispersion compensation technique. The problems to be overcome at exploitation of multiterabit WDM systems based on 40 Gbit/s optical transmissions are: chromatic dispersion (CD), polarization-mode dispersion (PMD), dispersion slope, and nonlinear effects of the transmission line. We have investigated the potentialities of modulation formats for 40 Gbit/s WDM networks where most of the listed problems are avoided. It is shown that Duobinary and differential phase shift keying (DPSK) modulation formats are perfectly suitable for ultra-high spectral efficient WDM systems and possess high resistance to dispersion and nonlinear optical effects (NOE).

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