Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 82, Issue 4, Pages 555-559Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-005-2125-6
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We have developed an optical fiber length stabilization system for the distribution of reference millimeter wave signals in a long-baseline phased-array radio telescope. The fiber length was compared with an absolute wavelength reference laser using a Michelson interferometer. We used a digital servo system including a digital phase-frequency discriminator with a wide phase dynamic range and a digital signal processor (DSP) for the digital servo system. All-digital servo system made it possible to realize a robust and precise length stabilization of a 25-km long optical fiber.
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