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Ortiz D, Casas FJ, Ruiz-Lombera R, et al. Electro-optic correlator for large-format microwave interferometry: Up-conversion and correlation stages performance analysis. Rev Sci Instrum. 2017;88(4):044702doi: 10.1063/1.4979811.
Ortiz, D., Casas, F. J., Ruiz-Lombera, R., & Mirapeix, J. (2017). Electro-optic correlator for large-format microwave interferometry: Up-conversion and correlation stages performance analysis. The Review of scientific instruments, 88(4), 044702. https://doi.org/10.1063/1.4979811
Ortiz, D, et al. "Electro-optic correlator for large-format microwave interferometry: Up-conversion and correlation stages performance analysis." The Review of scientific instruments vol. 88,4 (2017): 044702. doi: https://doi.org/10.1063/1.4979811
Ortiz D, Casas FJ, Ruiz-Lombera R, Mirapeix J. Electro-optic correlator for large-format microwave interferometry: Up-conversion and correlation stages performance analysis. Rev Sci Instrum. 2017 Apr;88(4):044702. doi: 10.1063/1.4979811. PMID: 28456241.
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Rev Sci Instrum. 2017 Apr;88(4):044702. doi: 10.1063/1.4979811.

Electro-optic correlator for large-format microwave interferometry: Up-conversion and correlation stages performance analysis.

The Review of scientific instruments

D Ortiz, Francisco J Casas, R Ruiz-Lombera, J Mirapeix

Affiliations

  1. Instituto de Física de Cantabria (IFCA), Avda. Los Castros s/n, Santander 39005, Spain.
  2. Grupo de Ingeniería fotónica (GIF), Plaza de la Ciencia s/n, Santander 39005, Spain.

PMID: 28456241 DOI: 10.1063/1.4979811

Abstract

In this paper, a microwave interferometer prototype with a near-infra-red optical correlator is proposed as a solution to get a large-format interferometer with hundreds of receivers for radio astronomy applications. A 10 Gbits/s Lithium Niobate modulator has been tested as part of an electro-optic correlator up-conversion stage that will be integrated in the interferometer prototype. Its internal circuitry consists of a single-drive modulator biased by a SubMiniature version A (SMA) connector allowing to up-convert microwave signals with bandwidths up to 12.5 GHz to the near infrared band. In order to characterize it, a 12 GHz tone and a bias voltage were applied to the SMA input using a polarization tee. Two different experimental techniques to stabilize the modulator operation point in its minimum optical carrier output power are described. The best achieved results showed a rather stable spectrum in amplitude and wavelength at the output of the modulator with an optical carrier level 23 dB lower than the signal of interest. On the other hand, preliminary measurements were made to analyze the correlation stage, using 4f and 6f optical configurations to characterize both the antenna/fiber array configuration and the corresponding point spread function.

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