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Article
Spectral Efficiency Improvement of the Optical Communication Systems

Authors: Aqeel R. Farhan --- Dr. Ali Y. Fattah
Journal: IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING المجلة العراقية لهندسة الحاسبات والاتصالات والسيطرة والنظم ISSN: 18119212 Year: 2014 Volume: 14 Issue: 1 Pages: 44-57
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Abstract –In this paper, different amplitude and phase modulation formats are investigated and compared to find the optimum one among them for high spectral efficiency (SE) Wavelength Division Multiplexing (WDM) systems with an acceptable value of the Bit Error Rate (BER). Also, the effectiveness of using the polarization interleaving scheme in minimizing the nonlinear effects in the optical fiber channel for the various modulation formats is investigated. (Optisystem v 7.0) A simulation package is used to simulate the system. The simulation results show the effectiveness of using the polarization interleaving in decreasing the nonlinear effects. RZ modulation formats are found to give a better BER value than the corresponding NRZ formats but with a smaller value of the SE. Among the compared modulation formats, RZ-AMI and the RZ-DQPSK are the only formats that are found to give the optimal performance for high capacity WDM networks.


Article
Polarization Division Multiplexing Coherent Optical OF DM Transmission Systems

Authors: Ali Y. Fattah1 --- Falah Hasan Abdul-Baqi2
Journal: IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING المجلة العراقية لهندسة الحاسبات والاتصالات والسيطرة والنظم ISSN: 18119212 Year: 2015 Volume: 15 Issue: 3 Pages: 64-76
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Abstract –High-capacity and long-haul transmission technologies are indispensableto develop cost-effective optical transport networks. Optical communication is rapidlyadvancing toward 1-Tera bit per second (Tb/s) and beyond transport. As the availablebandwidth of Standard Single-Mode Fiber (SSMF) is limited, high Spectral Efficiency(SE) becomes an important issue. Coherent Optical Orthogonal Frequency-DivisionMultiplexing (CO-OFDM) has become one of the promising candidates due to its highSE and resilience to linear channel impairments such as Chromatic Dispersion (CD).In this paper, based on Optisystem 11.0 software simulation platform, the performanceof a 1.6 Tb/s (16 x 100 Gb/s) PDM-CO-OFDM transmission system is investigatedinvest by using QPSK modulation format and applying Polarization InterleavingScheme (PIS) over 1440 km with 2 b/s/Hz spectral efficiency.

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