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IEC 61755-1:2022 covers dispersion unshifted single-mode fibre optic connection interfaces. It includes references, document structure details, definitions, and standardised optical connection grades. The grades are based on random mated connections between two optical connector populations according to required characteristics including fibre mode field diameter (MFD) mismatch. It also defines standardized test methods where appropriate. This second edition cancels and replaces the first edition published in 2005. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- deletion of Figure 2, Figure 3 and Table 4, and consideration of the whole parts of the text;
- addition of the test method for random mating of the multifibre connectors;
- introduction of a nomenclature for the specified core location variants;
- replacement of the limited MFD range, which is now in line with the complete MFD range specified in IEC 60793-2-50;
- replacement of the references to reliability standards to reliability technical reports;
- new general title for the series.