The attenuation of a number of chalcogenide glass optical fibres has been studied with regard to their exposure the environment. We demonstrate that gallium lanthanum sulfide (Ga:La:S) based glasses appear to be as resilient if not more so than arsenic sulfide (AS(2)S(3)) glass to the attack of moisture when stored uncoated in ambient conditions for various periods exceeding I year. The increase in the characteristic OH- attenuation peak was similar to 3-4 dB/m for all fibres following storage. Given the significant improvements achieved in AS(2)S(3) glass technology over recent years we believe that Ga:La:S based fibres can also be improved to at least match these levels with the advantage of being non-toxic and having a significantly higher melting temperature. Studies of the time-dependant attenuation of the optical fibres during immersion in water have also been carried out. These results show that the deleterious effect of moisture on these glasses occurs over a short time, similar to 24 h, thus having implications on the treatment and storage of fibre preforms prior to optical fibre drawing. (c) 2005 Elsevier B.V. All rights reserved.
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机译：关于硫族化物玻璃光纤的暴露环境，已经进行了研究。我们证明，基于硫化镧镧（Ga：La：S）的玻璃似乎比不像硫化砷（AS（2）S（3））的玻璃具有更大的回弹力，当在环境条件下未镀膜存储时对水分的攻击超过I年的各个时期。储存后，所有光纤的特征OH衰减峰的增加类似于3-4 dB / m。鉴于近年来AS（2）S（3）玻璃技术取得的显着进步，我们认为基于Ga：La：S的纤维也可以得到改进，至少与这些水平相符，并且具有无毒且具有高韧性的优点。熔化温度明显更高。还已经研究了光纤在浸入水中期间随时间的衰减。这些结果表明，水分对这些玻璃的有害作用发生在短时间内，类似于24小时，因此对光纤拉制之前的光纤预制棒的处理和储存具有影响。 （c）2005 Elsevier B.V.保留所有权利。
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