7 September 2010 Photonic integrator for A/D conversion
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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.
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Yiye Jin, Yiye Jin, Pablo A. Costanzo-Caso, Pablo A. Costanzo-Caso, Sergio Granieri, Sergio Granieri, Azad Siahmakoun, Azad Siahmakoun, } "Photonic integrator for A/D conversion", Proc. SPIE 7797, Optics and Photonics for Information Processing IV, 77970J (7 September 2010); doi: 10.1117/12.860736; https://doi.org/10.1117/12.860736

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