Farman Ali*, Yousaf Khan and Shahryar Shafique Qureshi Transmission Performance Comparison of 16*100 Gbps Dense Wavelength Division Multiplexed Long Haul Optical Networks at Different Advance Modulation Formats under the Influence of Nonlinear Impairments https://doi.org/10.1515/joc-2018-0185 Received September 11, 2018; accepted January 15, 2019 Abstract: Higher spectral efficiency and data rate per channel are the most cost-effective approaches to meet the exponential demand of data traffic in optical fiber network communication system. In this paper, diverse modulation formats are analyzed for Dense Wavelength Division Multiplexed system at 100 Gbps * 16 = 1600 Gbps data rates. The performance analysis of proffered system for Non-Return to Zero, Return to Zero, Carrier- Suppressed Return to Zero and Duo binary RZ with duty cycle 0.5 to 0.7 ranges like modulation formats are con- sidered to find optimum modulation format for a 100 Gbps bit rate per channel optical fiber transmission net- work system. The simulations are analyzed for different values of input power, length of fiber, nonlinear refrac- tive index, nonlinear dispersion and nonlinear effective area for all above mentioned modulation formats with spacing 100 to 250 GHz. to evaluate the effect of modula- tion format Fiber Bragg Gratting, optical fiber amplifier and Dispersion Compensation Fiber dispersion compen- sation techniques are enacted on this proposed optical network system. Keywords: carrier suppressed return to zero (CSRZ), non return to zero (NRZ), return to zero (RZ), duo binary return to zero (DRZ) 1 Introduction Recent advances in optical fiber communication caters to the explosive demand of huge internet traffic by relying on WDM (Wavelength Division Multiplexing) system using all optical amplifier and programmable switching modules to offer long range, robust and repeater less communication system [1, 2]. Optical fiber offer very large bandwidth so multiple channels can be transmitted through the common fiber using concept of WDM system. In Dense Wavelength Division Multiplexing (DWDM) sys- tem, spaces among wavelengths more closely than WDM optical transmission technique spaces among wave- lengths more closely than WDM system and therefore DWDM has data rate speed more than 10 Gbps/channel in long-haul fiber optics communication system. The ultra-high data rates and long-haul optical network includes dispersion and nonlinearity effects which must be managed to achieve high transmission range [3–5]. The key technique that keeps the total accumulated dis- persion low while suppressing nonlinear effects is the opposite value of dispersion . Fiber Bragg Grating (FBR), Dispersion Compensation Fiber (DCF), optical phase con- jugation and electrical equalizer are the ways through which dispersion compensation can be achieved. DCF and FBR techniques are used in this paper for dispersion compensation. Positive dispersion of a Single Mode Fiber (SMF) can be compensated by negative dispersion of DCF in dispersion management system [6, 7]. RZ and NRZ modulation formats are most often used in conventional standard fiber transmission lines. CSRZ and duo binary [6–9] modulation formats are also analyzed in this paper. At high bit rates the modulation formats, type of dispersion compensation scheme, and channel power become important issues for optimum system design. The factors such as spectral efficiency, power margin and tolerance against Group Velocity Dispersion (GVD) and against fiber nonlinearities like SPM (Self Phase Modulation), XPM (Cross Phase Modulation) FWM (Four Wave Maxing) and SRS (Stimulated Raman Scattering) are necessary terms that should be considered for right choice of modulation format. The spectral efficiency is define as η SE = B ch ΔV ch (1) where B means signal channel bit rate and Δv ch denotes channel spacing. The throughput of a DWDM transmis- sion system can be increased by increasing spectral *Corresponding author: Farman Ali, Electrical, Iqra National University Peshawar, Peshawar, Pakistan, E-mail: farman_pukhtun@yahoo.com Yousaf Khan, Electrical, University of Engineering and Technology Peshawar, Peshawar, Pakistan, E-mail: yousafkhalil@gmail.com Shahryar Shafique Qureshi, Electrical, Iqra National University Peshawar, Peshawar, Pakistan, E-mail: its.shahryar@gmail.com J. Opt. Commun. 2019; aop Brought to you by | Universitat de Barcelona Authenticated Download Date | 2/2/19 10:59 AM