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Proceedings Paper

Photonic second-order duty-cycle modulator
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Paper Abstract

The delta sigma modulator (DSM) is a device which transforms the amplitude information of an analog input signal to the duty cycle and frequency of a binary output. This device, typically employed in oversampled analog-to-digital converters, is based on a feedback loop which includes at least one integrator and one quantizer in the forward path. In this paper, a novel photonic second-order DSM is proposed and experimentally demonstrated. The system is composed of two inverted leaky integrator and one electro-optic quantizer. The maximum input frequency is around 2 MHz, limited by the fiber length of the accumulator and feedback loops, and the quantizer rise/fall times. The system is characterized at different input frequencies and waveforms (sinusoidal and saw tooth) to analyze the modulator performance and linearity. The binary output is acquired, processed and demodulated using a personal computer, in order to reconstruct the input analog signal. The reported fiber-optic DSM is very promising for future integration increasing the operation frequency up to GHz range.

Paper Details

Date Published: 25 October 2011
PDF: 7 pages
Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80115F (25 October 2011); doi: 10.1117/12.903286
Show Author Affiliations
Pablo A. Costanzo-Caso, Ctr. de Investigaciones Ópticas (Argentina)
Univ. Nacional de La Plata (Argentina)
Erin Reeves, Rose-Hulman Institute of Technology (United States)
Yiye Jin, Rose-Hulman Institute of Technology (United States)
Sergio Granieri, Rose-Hulman Institute of Technology (United States)
Azad Siahmakoun, Rose-Hulman Institute of Technology (United States)


Published in SPIE Proceedings Vol. 8011:
22nd Congress of the International Commission for Optics: Light for the Development of the World
Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Rufino Díaz-Uribe; Rufino Díaz-Uribe; Rufino Díaz-Uribe, Editor(s)

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