14 February 2008 Optical phase measurement and dynamic stabilization for a transmitted 81-GHz photonic ultra low phase noise reference through a SMF under controlled bending motion
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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.
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Sarmad AlBanna, Sarmad AlBanna, } "Optical phase measurement and dynamic stabilization for a transmitted 81-GHz photonic ultra low phase noise reference through a SMF under controlled bending motion", Proc. SPIE 6893, Terahertz Technology and Applications, 68930I (14 February 2008); doi: 10.1117/12.764081; https://doi.org/10.1117/12.764081
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