This part of IEC 62007 is a specification template for essential ratings and characteristics of the following categories of semiconductor optoelectronic devices to be used in the field of fibre optic systems and subsystems: – semiconductor photoemitters; – semiconductor photoelectric detectors; – monolithic or hybrid integrated optoelectronic devices and their modules. The object of this performance specification template is to provide a frame for the preparation of detail specifications for the essential ratings and characteristics. Detail specification writers may add specification parameters and/or groups of specification parameters for particular applications. However, detail specification writers may not remove specification parameters specified in this standard.