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Proceedings Paper

Photonic integrator for A/D conversion
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Paper Abstract

This paper presents a novel optical leaky integrator for an all-optical A/D converter based-on sigma-delta modulation. The device consists of two main components: a fiber ring resonator (FRR) and a wavelength converter. The FRR comprises a SOA and an optical filter that defines the resonance wavelength λ2. The modulated input signal, at wavelength λ1, changes the gain of the loop through cross-gain modulation (XGM) and thus modifies the loop accumulation. A theoretical model for the system is developed that accounts for critical design parameters such as the loop coupling ratio, length, and XGM in the SOA. The system is characterized for square input signals ranging 0.5- 5MHz. The integrator time constant is adjusted between 5% and 25% of the input signal period through modifications in the loop coupling ratio and the SOA driving-current. Experimental results show excellent agreements with the numerical simulations. Due to the length of the fiber-loop, the operation frequency of the integrator is limited to the MHz range. However, the operating frequency can be increased up to hundreds of MHz by shrinking the components' optical fibers, or up to GHz range, by using current photonic integration technologies.

Paper Details

Date Published: 7 September 2010
PDF: 8 pages
Proc. SPIE 7797, Optics and Photonics for Information Processing IV, 77970J (7 September 2010); doi: 10.1117/12.860736
Show Author Affiliations
Yiye Jin, Rose-Hulman Institute of Technology (United States)
Pablo A. Costanzo-Caso, Rose-Hulman Institute of Technology (United States)
Ctr. de Investigaciones Ópticas (Argentina)
Univ. Nacional de La Plata (Argentina)
Sergio Granieri, Rose-Hulman Institute of Technology (United States)
Azad Siahmakoun, Rose-Hulman Institute of Technology (United States)

Published in SPIE Proceedings Vol. 7797:
Optics and Photonics for Information Processing IV
Abdul Ahad Sami Awwal; Khan M. Iftekharuddin; Scott C. Burkhart, Editor(s)

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