CIOP   05384
CENTRO DE INVESTIGACIONES OPTICAS
Unidad Ejecutora - UE
artículos
Título:
Photonic Integrator for A/D Conversion
Autor/es:
YIYE JIN; PABLO A. COSTANZO CASO; SERGIO GRANIERI; AZAD SIAHMAKOUN
Revista:
SPIE
Editorial:
SPIE
Referencias:
Año: 2010 p. 1 - 8
ISSN:
0277-786X
Resumen:
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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 l2. The modulated
input signal, at wavelength l1, 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.