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Optical amplifiers. Test methods - Multichannel parameters. Interpolated source subtraction method using an optical spectrum analyzer Ingestion-build-48183 BS EN 13060 applies toWhat is BS EN 61290 10 4 Multichannel parameters of optical amplifiers? BS EN 61290 10 4 applies to all commercially available optical amplifiers (OAs) and optically amplified subsystems. BS EN 61290 10 4 applies to OAs using optically pumped fibres (OFAs based on either rare earth doped fibres or on the Raman effect), semiconductor optical amplifiers (SOAs) and waveguides (POWA). The test method described in BS EN 61290 10 4 is called interpolated