| http://www.w3.org/ns/prov#value | - In FIG. 8, numeral 1 indicates a transmitter, 2 is a receiver, 3 is an optical fiber forming an optical transmission line, 11 is an optical transmission circuit, 21 is a dispersion compensating fiber, 23 is an optical receiver circuit, 24 is a optical pumping source, 25 is a pumping light coupler, and 26 is an isolator.
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