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Proceedings Paper

Dispersion compensation requirements for optical CDMA using WDM lasers
Author(s): Antonio J. Mendez; Vincent Hernandez; Helena X.C. Feng; Jonathan Paul Heritage; William J. Lennon
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Paper Abstract

Optical code division multiple access (O-CDMA) uses very narrow transmission pulses and is thus susceptible to fiber optic link impairments. When the O-CDMA is implemented as wavelength/time (W/T) matrices which use wavelength division multiplexing (WDM) sources such as multi-frequency laser transmitters, the susceptibility may be higher due to: (a) the large bandwidth utilized and (b) the requirement that the various wavelength components of the codes be synchronized at the point of the data modulation and encoding as well as after (optical) correlation. A computer simulation based on the nonlinear Schroedinger equation (developed to study optical networking on the National Transparent Optical Network (NTON)) was modified to characterize the impairments on the propagation and decoding of W/T matrix codes over a link of the NTON. Three critical impairments were identified by the simulation: group velocity dispersion (GVD); the flatness of the optical amplifier gain; and the slope of the GVD. Subsequently, experiments were carried out on the NTON link to verify and refine the simulations as well as to suggest improvements in the W/T matrix signal processing design. The NTON link measurements quantified the O-CDMA dispersion compensation requirements. Dispersion compensation management is essential to assure the performance of W/T matrix codes.

Paper Details

Date Published: 7 June 2002
PDF: 7 pages
Proc. SPIE 4653, WDM and Photonic Switching Devices for Network Applications III, (7 June 2002); doi: 10.1117/12.469636
Show Author Affiliations
Antonio J. Mendez, Mendez R&D Associates (United States)
Vincent Hernandez, Lawrence Livermore National Lab. (United States)
Helena X.C. Feng, Univ. of California/Davis (United States)
Jonathan Paul Heritage, Univ. of California/Davis (United States)
William J. Lennon, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 4653:
WDM and Photonic Switching Devices for Network Applications III
Ray T. Chen; Joseph C. Chon, Editor(s)

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