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Proceedings Paper

Optical phase measurement and dynamic stabilization for a transmitted 81-GHz photonic ultra low phase noise reference through a SMF under controlled bending motion
Author(s): Sarmad AlBanna
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Paper Abstract

The ALMA project (Atacama Large Millimeter Array) is a collection of 50 radio telescopes that will be installed and operated in the high altitude desert of Atacama in northern Chile. The array is phased locked using a microwave reference generated from highly stable phase locked laser signals transmitted over 15km single mode fiber. In this paper we demonstrate the ability of generating and distributing high frequency photonic based microwave reference in a single mode fiber of 14 km to 2 of the ALMA radio telescopes. 81GHz photonic LO reference is generated and transmitted over the single mode fiber to the receivers of the 2 antennas. The paper will also present the method used to measure and dynamically stabilize the phase of the microwave photonics reference transmitted to 2 antennas while simulating antenna motion. The photonic phase correction system will null the unwanted phase in the microwave reference resulted from the motion of the telescope, maintaining coherence between the 2 antennas.

Paper Details

Date Published: 14 February 2008
PDF: 11 pages
Proc. SPIE 6893, Terahertz Technology and Applications, 68930I (14 February 2008); doi: 10.1117/12.764081
Show Author Affiliations
Sarmad AlBanna, National Radio Astronomy Observatory (United States)

Published in SPIE Proceedings Vol. 6893:
Terahertz Technology and Applications
Kurt J. Linden; Laurence P. Sadwick, Editor(s)

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