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

QUERIES?