[asac][almanews] ALMA Memos 443 Released

[Stacy Oliver]

ALMA MEMO #443

ALMA LO Distribution Round Trip Phase Correction

Bill Shillue (NRAO)

2002/11/14

Keywords: photonic, LO, reference, round trip, phase, fiber, stretcher

The ALMA requires a coherent local oscillator at each antenna. Due to the long distribution length from central building to each of
the antennas, the fiber optic path to each antenna must be stabilized to meet the ALMA specification. A round trip phase correction
technique has been adopted to meet these specifications, and that technique is described here. Also, a summary of various techniques
that have been used at other installations is given. Results reported here are given for tests completed through April, 2002.
Further tests are planned and will be reported at a later date.

View a pdf version of ALMA Memo #443.
http://www.alma.nrao.edu/memos/html-memos/alma443/memo443.pdf

Download a postscript version of ALMA Memo #443.
http://www.alma.nrao.edu/memos/html-memos/alma443/memo443.ps

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