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Proceedings Paper

Return-to-zero (RZ) modulation of multifrequency lasers (MFLs) for application to optical CDMA
Author(s): Antonio J. Mendez; John Michael Morookian
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Paper Abstract

Optical CDMA (O-CDMA) based on matrix codes (e.g., Wavelength/Time, or W/T, matrices) can have a higher capacity and spectral efficiency (bit/s/Hz) than WDM. We have ben exploring the implementation of W/T matrices with WDM components. The wavelength part of the W/T matrices is generated by a WDM laser array consisting of multiple independent laser cavities (each at a distinct ITU frequency) coupled through a semiconductor optical amplifier (SOA). These integrated laser arrays are known as MFLs. The time-like part of the W/T matrix codes is produced by Bragg grating arrays. The W/T matrix implementation requires that the wavelengths be synchronously on-off-keyed (OOF) with a return-to-zero (RZ) modulation of less than 25% duty cycle, and that the synchronicity be retained at the point of correlation (the receiver end). In this paper we explore on- off-keying the MFL SOA in order to achieve a synchronous RZ pulse-train which can then be externally data-modulated. Particular emphasis was placed on determining the smallest achievable pulse-widths and highest pulse repetition rates for the MFLs, since the long MFL cavity lengths may preclude fast modulation formats.

Paper Details

Date Published: 7 June 2002
PDF: 9 pages
Proc. SPIE 4653, WDM and Photonic Switching Devices for Network Applications III, (7 June 2002); doi: 10.1117/12.469637
Show Author Affiliations
Antonio J. Mendez, Mendez R&D Associates (United States)
John Michael Morookian, Jet Propulsion 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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