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Proceedings Paper

Photonic local oscillator technics for large-scale interferometers
Author(s): H. Kiuchi; M. Saito; S. Iguchi
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Paper Abstract

In signal transmission through optical fiber, cable length delay fluctuation accompanied by chromatic and polarization-mode dispersion affects the coherence of distributed signals. To maintain signal coherence, it is very important to generate very-high-frequency signals with minimum phase noise and transmission loss. In a photonic local signal generation/distribution system with a microwave-photonic signal generator and a real-time microwave-photonic signal phase stabilizer that we developed as an alternative photonic LO system for ALMA (Atacama Large Millimeter/sub-millimeter Array), signals are transmitted in the form of frequency difference between two coherent light waves, effectively maintaining the coherence of distributed reference signals. Through the development of the real-time phase stabilizer, we discovered that the system would be further improved with the introduction of a post-processing scheme phase stabilizer and confirmed its effectiveness by experiments.

Paper Details

Date Published: 27 September 2012
PDF: 9 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84442O (27 September 2012); doi: 10.1117/12.925907
Show Author Affiliations
H. Kiuchi, National Astronomical Observatory of Japan (Japan)
M. Saito, National Astronomical Observatory of Japan (Japan)
S. Iguchi, National Astronomical Observatory of Japan (Japan)

Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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