© The Institution of Electrical Engineers
The letter reports the 8000 m deep-sea trial of a 400 Mbit/s submarine optical system, FS-400M, which was carried out in the Ogasawara trench in November 1984. Two repeaters fully integrated by six monolithic ICs, and 28 km-long submarine cables were used. In addition to transmission experiments for repeater spacing of 40 km, repair operation was simulated to confirm operational feasibility of the FS-400M.
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