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System-performance analysis of optimized gain-switched pulse source employed in 40-and 80-Gb/s OTDM systems

Anandarajah, Prince M. and Clarke, Aisling M. and Guignard, Celine and Bramerie, Laurent and Barry, Liam P. and Harvey, John D. and Simon, Jean Claude (2007) System-performance analysis of optimized gain-switched pulse source employed in 40-and 80-Gb/s OTDM systems. Journal of Lightwave Technology, 25 (6). pp. 1495-1502. ISSN 0733-8724

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The development of ultrashort optical pulse sources, exhibiting excellent temporal and spectral profiles, will play a crucial role in the performance of future optical time division multiplexed (OTDM) systems. In this paper, we demonstrate the difference in performance in 40- and 80-Gb/s OTDM systems between optical pulse sources based on a gain-switched laser whose pulses are compressed by a nonlinearly and linearly chirped fiber Bragg grating. The results achieved show that nonlinear chirp in the wings of the pulse leads to temporal pedestals formed on either side of the pulse when using the linearly chirped grating, whereas with the nonlinearly chirped grating, pedestals are essentially eliminated. In an OTDM system, these pedestals cause coherent interaction between neighboring channels, resulting in intensity fluctuations that lead to a power penalty of 1.5 dB (40 Gb/s) and 3.5 dB (80 Gb/s) in comparison to the case where the nonlinearly chirped grating is used. Simulations carried out with the aid of Virtual Photonics Inc. verify the results achieved.

Item Type:Article (Published)
Uncontrolled Keywords:grating; optical communication; optical pulse generation; pulse compression;
Subjects:Engineering > Optical communication
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Electronic Engineering
Research Initiatives and Centres > Research Institute for Networks and Communications Engineering (RINCE)
Publisher:Institute of Electrical and Electronics Engineers
Official URL:
Copyright Information:Copyright © 2007 IEEE. Reprinted from the Journal of Lightwave Technology.This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the Dublin City University's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
ID Code:160
Deposited On:28 Jan 2008 by DORAS Administrator. Last Modified 02 Feb 2009 11:57

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