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Chromatic dispersion monitoring for high-speed WDM systems using two-photon absorption in a semiconductor microcavity

Bondarczuk, Krzysztof and Maguire, Paul J. and Reid, Douglas A. and Barry, Liam P. and O'Dowd, J. and Guo, W. H. and Lynch, M. and Bradley, Ann-Louise and Donegan, J. F. (2009) Chromatic dispersion monitoring for high-speed WDM systems using two-photon absorption in a semiconductor microcavity. IEEE Journal of Quantum Electronics, 45 (1). pp. 90-99. ISSN 0018-9197

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Abstract

This paper presents a theoretical and experimental investigation into the use of a two-photon absorption (TPA) photodetector for use in chromatic dispersion (CD) monitoring in high-speed, WDM network. In order to overcome the inefficiency associated with the nonlinear optical-to-electrical TPA process, a microcavity structure is employed. An interesting feature of such a solution is the fact that the microcavity enhances only a narrow wavelength range determined by device design and angle at which the signal enters the device. Thus, a single device can be used to monitor a number of different wavelength channels without the need for additional external filters. When using a nonlinear photodetector, the photocurrent generated for Gaussian pulses is inversely related to the pulsewidth. However, when using a microcavity structure, the cavity bandwidth also needs to be considered, as does the shape of the optical pulses incident on the device. Simulation results are presented for a variety of cavity bandwidths, pulse shapes and durations, and spacing between adjacent wavelength channels. These results are verified experimental using a microcavity with a bandwidth of 260 GHz (2.1 nm) at normal incident angle, with the incident signal comprising of two wavelength channels separated by 1.25 THz (10 nm), each operating at an aggregate data rate of 160 Gb/s. The results demonstrate the applicability of the presented technique to monitor accumulated dispersion fluctuations in a range of 3 ps/nm for 160 Gb/s RZ data channel.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:light absorption; nonlinear optics; optical fibre dispersion; optical pulse shaping; photodetectors; photon-photon interactions; wavelength division multiplexing;
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:http://dx.doi.org/10.1109/JQE.2008.2001942
Copyright Information:©2009 IEEE. 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 to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
ID Code:15551
Deposited On:26 Jul 2010 11:54 by DORAS Administrator. Last Modified 20 Oct 2014 15:34

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