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Gives the essential ratings and characteristics of the following categories or subcategories of optoelectronic devices which are not intended to be used in the field of fibre optic systems or subsystems: - Semieconductor photoemitters, including: . light-emitting diodes (LEDs); . infrared-emitting diodes (REDs); . laser diodes. - Semieconductor photoelectric detectors, including: . photodiodes; . phototransistors. - Semieconductor photosensitive devices. - Semieconductor devices utilizing the optical radiation for internal operations, including: . photocouplers, optocouplers.