anx_III__table__37

X.C.IV.001 | Optical sensing fibres that are modified structurally to have a “beat length” of less than 500 mm (high birefringence) or optical sensor materials not described in 6C002.b (19) and having a zinc content of equal to or more than 6 % by “mole fraction”. Technical Note: For the purpose of X.C.IV.001: 1) “Mole fraction” is defined as the ratio of moles of ZnTe to the sum of the moles of CdTe and ZnTe present in the crystal. 2) “Beat length” is the distance over which two orthogonally polarised signals, initially in phase, must pass in order to achieve a 2 Pi radian(s) phase difference.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-15 · Text as adopted (Official Journal); later amendments are not incorporated in this text.