Design and simulation of optical add-drop multiplexer

مقدم أطروحة جامعية

Hassun, Ruhayl Jamal

مشرف أطروحة جامعية

al-Samari, Ayid Khalaf

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكهربائية

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2013

الملخص الإنجليزي

One of the superior features of optical fiber communication link its very high capacity.

It can be upgraded by commuting a number of wavelengths on to single fiber.

An optical (add /drop) multiplexer (OADM) is a device which can be used to drop a particular wavelength and add another.

This device can be considered a key element in a wavelength division multiplexing in optical fiber networks.

In this thesis a new approach has been proposed to design an (OADM) made in silica on silicon waveguide by combining Bragg gratings (BGs) and 2X2 3dB Multimode Interference couplers (3dB MMI coupler ) in a Mach-Zehnder interferometer.

This design technique shows an interesting result in obtaining low insertion loss, low return loss, insensitivity to wavelength and polarization, high thermal stability, large optical bandwidth and low crosstalk.

The proposed system involves design, the (OADM) which consists of three stages: the first one is to design and simulate 2X2 3dB MMI coupler by using (OptiBPM 9) software.

The second stage is to design and simulate the Bragg Grating (BG) by using the (OptiGrating 4.2) software, it provides an accurate analysis of the BG characteristics.

The third stage is to design and simulate a proposed OADM by combining the previous stages to study the performance of each port of the OADM.

A software package (OptiSystem 11) is used for this purpose, this software is used to obtain the eye diagrams, estimate the Q-factor and the BER for the proposed OADM in DWDM system.

The (OADM) was simulated for add and drop with channel wavelength = 1550 nm at transmission data rate of 10 GB/s.

The DWDM system which was used in the simulation has 16 channels, the channel spacing was equal to 100 GHz (0.8 nm), the power of each channel was assumed to be 1mW (0 dBm) and the modulator was NRZ-OOK.

The simulation results give insertion loss equal to 0.6 dB, polarization dependent loss (PDL) equal to 0.00446 dB, the crosstalk due to adjacent channels (interband crosstalk) was less than -28 dB, non-adjacent channel isolation is more than 55 dB, interaband crosstalk is less than -49 dB, return loss is less than -55 dB and the Q-factor is 62 .

Also the effect of the nonlinearity due to the increase in the input power on the system performance is studied.

The study showed that at the suitable optical power with range from 10 dBm to -10 dBm per channel is the best result to give low BER.

The performance of the system is also studied for variation in temperature.

The simulation results indicate that the system can detect the dropped signal (1550 nm) when the SMF-28 has a max-length of 80 km without amplifier and Dispersion Compensating Fiber (DCF).

But if the DCF and amplifier were used, the maximum distance would increase to 6250 km in order to obtain the Q -factor equal to 7.15, BER equal to 3.5 x10-13 and OSNR 17.5 dB.

A cascade connection technique of the OADM is also studied in order to obtain MUX/DEMUX in DWDM system.

التخصصات الرئيسية

الهندسة الكهربائية

الموضوعات

• الاتصالات السلكية و اللاسلكية
• الاتصالات الضوئية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-418344