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Chapter 11 Optical Amplifiers. 11.6 WAVELENGTH CONVERTERS 11.6.1 Optical-Gating Wavelength Converters 11.6.2 Wave-Mixing Wavelength Converters. 11.3 ERBIUM-DOPED FIBER AMPLIFIERS . The active medium in an optical fiber amplifier consists of a nominally 10- to 30-m length of optical fiber that h
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