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ADVANCE OPTICAL MODULATION FORMATS FOR HIGH CAPACITY
OPTICALLY ROUTED TRANSPORT NETWORKS
BYSATYA PRAKASH ROUT
OUTLINE Abstract Literature Review Introduction To Optical Networks Advance Modulation Formats Comparison and Effects of Optical Modulation
Formats on Performance of Optical Network Conclusion Proposed Future Work References
ABSTRACT
Next generation optical network of 10 Gb/s and 40 Gb/s are based on optically routed WDM/DWDM system. Enabling global broadband services and high intensity bandwidth applications require higher per fiber transport capacities and lower costs per end to end data with higher spectral efficiencies. So various optical modulation formats are used to achieve high spectral efficiency and designing high speed WDM optical network. This results to various linear and non linear impairments that restrict the speed of optically routed transport network.
LITERATURE REVIEW The high speed optical networks can be achieved
by using proper advance modulation formats to reduce linear and non linear impairments.
Research is fully based on how we can opt different modulators along with different a modulation formats to achieve a cost effective network.
Comparison of various optical modulation formats by analyzing the spectral efficiency
INTRODUCTION TO OPTICAL NETWORKS
Todays world relies on high speed broadband services such as Multimedia broadcast services, Voice and Data Services, high speed computer networking etc. in a cost effective manner.
Optical communication system provides an excellent solution to achieve high data rate communication system
Optical Communication system can support Tb/s capabilities with thousand kilometers which makes an ideal base for high capacity wireline networking
ADVANCE MODULATION FORMATS
ADVANCE MODULATION FORMATS
Intensity modulation formats
1. Non-Return To Zero On-Off Keying(NRZ-OOK)
2. Return To Zero On-Off Keying(RZ-OOK)
3. Carrier-Suppressed Return To Zero (CSRZ)
4 Duo-Binary Optical Modulation
ADVANCE MODULATION FORMATS
Phase Modulation Formats
1. DQPSK-NRZ Modulation Format
2. DQPSK-RZ Modulation Format
3. DPSK-RZ Modulation Format
4. DPSK-NRZ Modulation Format
COMPARISON
EFFECTS
CONCLUSION Advanced optical modulation formats help in
designing high capacity optically routed network/ WDM network.
While designing 10Gbps/40Gbps/100Gbps optical transport networks, advance modulation plays an crucial role of mitigating the linear distortions and non linear distortion
Spectral efficiency and throughput is well shaped by implementing advance modulation formats
FUTURE WORK Implementing and focusing on two advance
modulation formats that combats fiber nonlinear impairments
1. Correlative Coding 2. Partial response formats
REFERENCES Peter J. Winzer, Rene´-Jean Essiambre, Advanced Optical
Modulation Formats., Choice of the right modulation format is key to building flexible and cost-effective high-capacity optically routed wavelength division multiplexed fiber networks., Vol. 94., No. 5., May 2006
,Eugen Lach, Wilfried Idler, Modulation formats for 100G and beyond., Optical Fiber Technology 17 (2011)., 377–386
Peter J. Winzer, Modulation and multiplexing in optical communication systems., IEEE LEOS NEWSLETTER., February 2009
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