Abstract
In previous work,(1) it has been shown that the magnitude of the OH absorption at 1.38 µm in silica fibers can be reduced by an OH → OD exchange process. In post-treated fibers a reduction exceeding a factor of 150 has been demonstrated. In this work we show a reduction in the OH absorption in a MCVD-made fiber by treating only the substrate tube used to fabricate the preform. The Heraus waveguide quality T08 tubing, 16 mm o.d., 13 mm i.d., was treated at 1000°C in a. D2 atmosphere for 20 hours (See Fig. 1). In this process the OH in the tube was converted to OD,(2) and in addition, D2 gas was dissolved in the silica with a concentration estimated(3)to be 1017 molecules/cm3.
© 1981 Optical Society of America
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