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http://slidepdf.com/reader/full/11292027 1/18

Optical Transmission in WDM System

using Various Modulation Formats

Supervisor

Er.LovkeshGurpreet Singh

M.Tech 2nd Year

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Outline

• Introduction to WDM system

• Why WDM?

•

Literature Review• Reference

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Wavelength Division Multiplexing

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WDM System

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Why WDM

•Capacity

•Transparency

•Scalability •Wavelength routing and switching

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Components of WDM System

Active Optical Components

• Tunable Optical Filter

• Optical amplifier

Passive Optical Components

• Wavelength Selective Splitters

• Wavelength Selective Couplers

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System Performance Issues

• Stimulated Raman Scattering (SRS)

• Stimulated Brillouin Scattering (SBS)

• Self Phase Modulation (SPM)

• Cross Phase Modulation (XPM)

• Four Wave Mixing (FWM)

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Various Modulation Techniques

• Phase Shift Keying (PSK)

• Quadrature Phase Shift Keying (QPSK)

• Minimum Shift Keying (MSK)

• Quadrature Amplitude Modulation (QAM)

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Literature Review

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Channel Capacity of WDM Systems Using

Constant-Intensity Modulation Formats

• Constant-intensity Modulation increase the spectral efficiency

in WDM systems

Spectral efficiency vs. input power density

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Q-Factor and Jitter performance in WDM systems using RZ,

NRZ and Duo binary modulation formats at different

distances

Quality Factor of RZ, NRZ and Duo Binary modulation formats

The duo binary modulation format can be recommended for long distance

communication systems at high bit rates. It is observed that in NRZ

modulation format the overall Quality factor is better and it will be

decreases as the distance increases.

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Jitter Performance of RZ, NRZ and Duo

Binary modulation formats

Jitter or per delay will be less in case of NRZ modulation format. It is

concluded that the RZ modulation format is best for the long distance

optical communication system due to its low value of Jitter and BER to

the dispersion at high bit rates

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Year Author Topic Result

2002 Keang-Po Ho and

Joseph M. Kahn

Channel Capacity of

WDM Systems Using

Constant-Intensity

Modulation Formats

Constant-intensity

Modulation increase the

spectral efficiency in WDM

systems.

Paper Review

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2013 Anju Phogat, Tarun Gulati,

Deepak Malik

Q-Factor and Jitter

performance in WDMsystems using RZ,

NRZ and Duo binary

modulation formats at

different distances

Performance of RZ,NRZ

Duo Binary modulationdetermined on the basis

of Q-factor and jitter of

WDM system.

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2005 Takahisa Fujita& Shingo Mori

OOK/FSK WDMSystem Using

External Optical FSK

Modulation

The receiver Sensitivity isincreased in each WDM

channels by using an optical

FSK Modulator.

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2004 Stefan

Schollmann &

Werner

Rosenkranz

Impact of SRS-

induced Crosstalk for

different modulation

formats in WDM

system

PSK Modulation Reduced

SRS induced Crosstalk.

Crosstalk can be neglected

completely using RZ DPSK

modulated signal.

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References

[1] Keang-Po Ho and Joseph M. Kahn, “Channel Capacity of WDM Systems

Using Constant- Intensity Modulation Formats,”IEEE Anaheim, CA,

March 17-22, 2002.

[2] Takahisa Fujita & Shingo Mori, “OOK/FSK WDM System Using External

Optical FSK Modulation,” IEEE ECOC 2005 Proceedings-Vol.4.

[3] Stefan Schollmann & Werner Rosen kranz , “Impact of SRS-induced

Crosstalk for different modulation formats in WDM system,” 2004.

[4] Iftikhar Rasheed, Muhammad Abdullah, Qazi Md. Hamza Mansoor, Zia-

ur-Rehman, “Novel Approaches for Suppression of Four Wave Mixing in

WDM System Using Concocted Modulation Techniques,” 2012 10thInternational Conference on Frontiers of Information Technology.

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Thank You.....

Documents

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