Type

Journal Article

Authors

Ann Louise Bradley
M. Lynch
W. H. Guo
J. O'Dowd
Liam P. Barry
Douglas A. Reid
John Donegan
Paul J. Maguire
Louise Bradley
Krzysztof Bondarczuk

Subjects

Physics

Topics
optical pulse shaping photodetectors monitoring systems optical fibre dispersion photon photon interactions two photon absorption tpa experimental photon photon interactions wavelength division multiplexing high speed systems light absorption optical communication wavelength division multiplexing nonlinear optics

Chromatic dispersion monitoring for high-speed WDM systems using two-photon absorption in a semiconductor microcavity (2009)

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.
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Full list of authors on original publication

Ann Louise Bradley, M. Lynch, W. H. Guo, J. O'Dowd, Liam P. Barry, Douglas A. Reid, John Donegan, Paul J. Maguire, Louise Bradley, Krzysztof Bondarczuk

Experts in our system

1
Ann Louise Bradley
Trinity College Dublin
Total Publications: 36
 
2
John Francis Donegan
Trinity College Dublin
Total Publications: 152
 
3
Louise Bradley
Trinity College Dublin
Total Publications: 62