[asac][almanews] ALMA Memos 439 and 440 Released

[Stacy Oliver]

ALMA MEMO #439

Millimetre Wave Generation Using an Optical Comb Generator with Optical Phase-Locked Loops

Pengbo Shen and Phillip A. Davies, Dept. Of Electronics, University of Kent, Canterbury
William P. Shillue, Larry R. D'Addario, and John M. Payne, NRAO

2002-10-31 

Keywords: Comb Generator, Photonic, lasers, LO

(This memo is also presented at the 2002 International Topical Meeting on Microwave Photonics, 
a conference in Awaji Japan, and also appears in the conference digest)

We report the generation of millimeter-wave signals to 158 GHz with phase noise better than -75 dBc/Hz at 
100 kHz offset, by heterodyning of two laser which are optically phase-locked through an Optical Comb 
Generator. 
 
View a pdf version of ALMA Memo #439.
http://www.alma.nrao.edu/memos/html-memos/alma439/memo439.pdf

Download a postscript version of ALMA Memo #439.
http://www.alma.nrao.edu/memos/html-memos/alma439/memo439.ps

________________________________________________________________________________________________

ALMA Memo # 440

Photonic Techniques for Local Oscillator Generation and Distribution in Millimeter-Wave Radio Astronomy

10/31/2002

John M. Payne and William P. Shillue, National Radio Astronomy Observatory

Keywords: photonic, LO,  photomixer

{Note: This memo was an invited talk at the 2002 International Topical Meeting on Microwave 
Photonics, a conference held in Awaji Japan, and also appears in the conference digest.  It repeats some 
information that has already been presented in previous ALMA memos, and is included here in the memo 
series because the conference proceedings are not widely distributed} 

A number of photonics techniques are being used for Local Oscillator (LO) generation and distribution 
for millimeter-wavelength radio astronomy. Many of these are being implemented or considered for use 
on the Atacama Large Millimeter Array (ALMA) project.

View a pdf version of ALMA Memo #440.
http://www.alma.nrao.edu/memos/html-memos/alma440/memo440.pdf

Download a postscript version of ALMA Memo #440.
http://www.alma.nrao.edu/memos/html-memos/alma440/memo440.ps
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