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24 September 2012 The ALMA photonic local oscillator system
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Abstract
The Atacama Large Millimeter Array (ALMA) Photonic Local Oscillator (PLO) is an advanced photonics system that generates and distributes all of the Local Oscillator (LO) and timing references for the ALMA radio telescope array. These LO and timing references are used by the receivers and electronics at the antennas, and by the Correlator in the central building. Due to the unprecedented combination of high sky frequencies (up to 950 GHz) and long baseline lengths of up to 15 kilometers, the ALMA 1st LO requirement is particularly stringent, with extremely precise timing and synchronization needed down to the ~10 femtosecond level.
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Bill Shillue, Wes Grammer, Christophe Jacques, Rodrigo Brito, Jack Meadows, Jason Castro, Yoshihiro Masui, Robert Treacy, and Jean-François Cliche "The ALMA photonic local oscillator system", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 845216 (24 September 2012); https://doi.org/10.1117/12.927174
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