ALMA Memo #376
Integration of LO Drivers, Photonic Reference, and Central Reference Generator

Eric W. Bryerton, William Shillue, Dorsey L. Thacker, Robert Freund, Andrea Vaccari, James Jackson, Robert Long, Kamaljeet S. Saini, and Richard F. Bradley
2001-05-18

These measurements represent the first test of a local-oscillator (LO) driver based on a multiplied YIG-tuned oscillator (YTO) locked to a variable frequency photonic mm-wave reference. The reference is provided as a beatnote between two optical signals and is carried from a remote location by 10 meters of optical fiber to a photomixer at the LO driver site. Phase noise measurements were performed at about 80 GHz. A pre-prototype of the Central Reference Generator (CRG) developed in Socorro was also used in the tests as the fundamental reference from which all other sources were synchronized.

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