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Optical fibres - Product specifications. Sectional specification for polarization-maintaining fibres Ingestion-build-54371 The confidentiality and integrity of1 Scope This part of IEC 60793 is applicable to optical fibre types D1, D2, D3, as described in Table 1. These fibres are polarization maintaining fibre types, and are used or can be incorporated in information transmission equipment and optical fibre cable. These fibres are available for use in optical transport networks. Three types of requirements apply to these fibres: general requirements defined in IEC 607932; specific requirements common to the