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Calibration of wavelength/optical frequency measurement instruments - Michelson interferometer single wavelength meters Ingestion-build-48068 Who is BS 7562-4 -What is BS EN 62129 2 Calibration of wavelength about? BS EN 62129 2 is the second part of a multi series standard used for Calibration of wavelength optical frequency measurement instruments. BS EN 62129 2 is applicable to instruments measuring the vacuum wavelength or optical frequency emitted from sources that are typical for the fiber optic communications industry. These sources include Distributed Feedback (DFB) laser diodes, External Cavity