Design and performance analysis of long-haul, Ultra wideband WDM system

مقدم أطروحة جامعية

Abbas, Rasha Hasan

مشرف أطروحة جامعية

Fattah, Ali Yusuf

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكهربائية

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2011

الملخص الإنجليزي

-In this work, a long haul 16-channel WDM system is proposed with different distances and different modulation formats.

The practical components of WDM system models have been chosen to overcome the overall system limitations because of the role played by these in the transmission processes (e.g., optical fiber, Continuous Wave laser diode (CW), multiplexer,…, etc.).

Erbium-Doped Fiber Amplifiers (EDFAs) are used instead of conventional electronic regenerators to amplify the optical signals and especially to increase the transmission bandwidth and distance, and also to increase the individual bit-rate of optical channels, but this will create some limitations.

These limitations include fiber nonlinear effects and crosstalk that generally arise due to nonlinearity in optical fiber.

The nonlinearities in optical fiber are classified into Stimulated Brillouin Scattering (SBS), Stimulated Raman Scattering (SRS), Self Phase Modulation (SPM), Cross Phase Modulation (XPM), and Four-Wave Mixing (FWM).

While, crosstalk is classified into interchannel and intrachannel crosstalk.

The present work، gives many solutions to reduce these limitations.

SBS, SRS, and SPM can be reduced by making channel spacing as close together as possible and keeping signal power below the SBS, SRS, and SPM thresholds, while, crosstalk due to the interference from adjacent channels can be reduced by using Return-to-Zero (RZ) format.

Different WDM systems that use 33% RZ-DPSK and 33% RZ-DQPSK modulation formats are proposed for different distances (80 km, 400 km, 800 km).

The simulated DPSK modulation format at 40 Gb/s are simulated and designed.

The 16-channel with channel spaced by 200 GHz are transmitted over 100 km.

The received binary DPSK signal obtained from the simulated system designed is clear and can be distinguished easily by the receiver and the eye is opend enough.

Therefore, the performance is good enough and distortion due to dispersion is relatively low.

This is because the dispersion at these channels is fully compensated by in-line dispersion compensation units.

The two models of modulation formats (33% RZ-DPSK and 33% RZ-DQPSK) are simulated for single channel at 10 Gb/s.

the optical spectrum obtained from two simulated systems designed are -24 dBm and -19 dBm, respectively.

Signal spectrum, bit pattern, eye diagram, BER, and scatter plots of 33% duty cycle single channel RZ-DPSK and 33% duty cycle single channel RZ-DQPSK signals and 16-channel 40 Gb/s 2DPSK WDM system are done using the “OptiPerformer”software and “Optical Simulation “software with programs written using MATLAB version 7.9.0.529 R2009b.

التخصصات الرئيسية

هندسة الاتصالات

الموضوعات

• الاتصالات السلكية و اللاسلكية
• الاتصالات الضوئية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-304981