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The Atacama Large Millimeter/submillimeter Array (ALMA) is the largest astronomical project under an international partnership of East Asia, Europe, and North America in cooperation with the Republic of Chile. ALMA will be composed of 66 high precision antennas with two antenna sizes, 54 12-m antennas and 12 7-m antennas. By reconfiguring antennas, the array can achieve an angular resolution equivalent...
We’ve developed local oscillator dissemination system for ALMA. The high-purity 120GHz local oscillator was delivered as a heterodyne beat signal over 25 km through length corrected optical fibers with phase fluctuation of 10−2 radian.
Millimeter signal generation with high spectral purity and low phase fluctuations up to 100 GHz were demonstrated with an optical method in which two external-cavity laser diodes were phase-locked to an electro-optic modulator (EOM)-based optical frequency comb generator (OFCG). The additional phase noise caused from the cavity fluctuation in OFCG was completely canceled, and the phase noise of the...
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