Paper |
Title |
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S10TS08 |
An Optical Fiber Phase Lock Network of a Radio Interferometer |
371 |
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- M. Nishio, S. Kawashima, H. Nakajima, C. Torii
NAO-NRO, Minamisaku, Nagano, Japan
- N. Futagawa, K. Nishikawa, T. Takabayashi
Space and Laser Communication Development Division, NEC Corporation, Yokohama, Japan
- S. Tanaka
Sumitomo Electric Industries Ltd., Yokohama Laboratory, Yakohama, Japan
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A new phase-lock network using fiber-optic system was developed as a local signal distribution system for 84 antennas of the Nobeyama Radioheliograph. This network is an open loop system and consists of a master oscillator with an E/O converter, an 1-to-84 optical divider, phase stable optical fiber cables and phase stable phase-locked oscillators with O/E converters. Phase stability of the network and phase noise generated at the O/E converter are discussed. This phase-lock network insures the required phase stability of 3°/6 hours. The phase noise increases the coherent loss of 0.1 % at the correlator output, which is very low. This is the first large application of fiber optic devices to an open loop phase-lock network. Our system is very simple and phase-stable. Therefore, it is suitable to the connected array with large number of antennas.
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DOI • |
reference for this paper
※ doi:10.18429/JACoW-ICALEPCS1991-S10TS08
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About • |
Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 |
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