It was observed that the loss of a Ge-doped graded index (GI) fibre during gamma irradiation grows stronger at a longer wavelength (about 1300 nm) than at a shorter one (830 nm). The same is known from Ge-doped and undoped single mode (SM) fibres at about 1550 and 1300 nm. During longer irradiations (/spl les/2 d) it was found that the loss of the GI fibre at 830 nm was reduced by photobleaching, leading to approximately the same loss at 830 and 1300 nm during irradiation with higher light powers (/spl ges/10 /spl mu/W). The stronger loss increase at 1550 nm of a Ge-doped SM fibre continued for more than 70 days, leading to an about 1.5 times higher loss at 1550 nm than at 1300 nm. The reason seems to be a long-lived absorption peak in the far IR.
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机译：观察到，在γ辐射期间损失Ge掺杂的渐变指数（Gi）纤维在较长的波长（约1300nm）中的较强比在较短的一个（830nm）中生长。在大约1550和1300nm的Ge掺杂和未掺杂的单模（SM）纤维中是相同的。在更长的照射（/ SPL LES / 2d）期间，发现通过光漂白降低了830nm处的GI纤维的损失，导致在具有较高光功率的照射期间830和1300nm的损耗大致相同的损耗（/ SPL GES / 10 / spl mu / w）。 GE掺杂SM纤维的1550nm处的较强损失持续超过70天，导致1550nm损失的约1.5倍，而不是1300nm。原因似乎是远红外的长期吸收峰。
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