Author: Nishikawa, K.
Paper Title Page
S10TS08 An Optical Fiber Phase Lock Network of a Radio Interferometer 371
 
  • 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
 
  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.  
DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S10TS08  
About • Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992  
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