[asac] [almanews] ALMA Memo 508 Released

[Stacy Oliver]

ALMA Memo # 508
Low Phase Noise Laser Synthesizer with Simple Configuration Adopting Phase
Modulator and Fiber Bragg Gratings 
T. Yamamoto (NTT Network Innovation Laboratories), 
S. Kawanishi (NTT Network Innovation Laboratories), 
A. Ueda (National Astronomical Observatory of Japan), 
M. Ishiguro (National Astronomical Observatory of Japan) 
2004-12-01
Keywords: Laser Synthesizer, Phase Noise, Phase Modulator, Fiber Bragg
Grating 
We introduce a novel laser synthesizer with a simple configuration that
contains no phase lock loop. This laser synthesizer generates an optical
beat signal by modulating a CW light using a phase modulator and selecting
two line spectra from modulation sidebands using serially-connected fiber
Bragg gratings. With this configuration, the optical beat signal is obtained
from a single laser source by converting CW laser light into an optical beat
signal through a single optical path. This enables us to obtain a low phase
noise of the optical beat signal which is comparable to that of the RF
synthesizer that drives the phase modulator. In addition, polarization
stability is also obtained between the two line spectra. The complete
frequency range of the optical beat signals required in ALMA can be covered
using this laser synthesizer. 
View a pdf version of ALMA Memo #508. 
http://www.alma.nrao.edu/memos/html-memos/alma508/memo508.pdf

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