FIELD: communications engineering. SUBSTANCE: amplifier has optical fiber sections with active core, single-mode for optical pumping radiations and signal, and dichloric communication member 6 built up of two optical fiber sections 9, 10, single-mode for optical pumping radiations and signal, interconnected on one section 11 by melting respective coats and installing respective cores on mentioned section 11 which are common for both. EFFECT: improved design. 10 cl, 3 dwg
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