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Proceedings Paper

A feedforward system for dynamic equalization of a chirped laser source suitable For photonic analog-to-digital conversion
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Paper Abstract

In this work we present a method for improving the uniformity of the optical spectrum or the temporal intensity profile of a quasi-CW, linearly chirped laser source covering the time interval between subsequent pulses. A novel laser cavity design, referred to as the Theta (Θ) cavity, provides linearly chirped pulses directly from the laser oscillator that having non-uniform optical spectrum, that is mapped into the temporal intensity profile of the pulse, due to the frequency-to-time mapping nature of this cavity design. The system developed in this work has been designed to improve the spectral and temporal intensity profile of lasers for photonic signal processing. A fiberized feed-forward system is implemented to reduce variations in the temporal intensity profile, or the optical spectrum due to the time-to-frequency mapping, input to the system. In the feedforward scheme presented, the quasi-CW pulse train generated from the laser is split and part of it is photodetected, while the electrical signal generated alters the transmittance of the second part of the input as it goes through an amplitude modulator, resulting in increase in the uniformity of the signal. The contrast of the optical spectrum of a chirped pulse at input to the system is improved from 51% to 16%, or 3.1 times.

Paper Details

Date Published: 29 April 2009
PDF: 12 pages
Proc. SPIE 7339, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications V, 733904 (29 April 2009); doi: 10.1117/12.820686
Show Author Affiliations
Dimitrios Mandridis, College of Optics & Photonics, Univ. of Central Florida (United States)
Ibrahim T. Ozdur, College of Optics & Photonics, Univ. of Central Florida (United States)
Peter J. Delfyett, College of Optics & Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 7339:
Enabling Photonics Technologies for Defense, Security, and Aerospace Applications V
Michael J. Hayduk; Peter J. Delfyett; Andrew R. Pirich; Eric J. Donkor, Editor(s)

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