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Improved Long-Term DC Drift in OH-Reduced Lithium Niobate Optical Intensity Modulators
Authors:Nagata H  Ichikawa J  Mitsugi N  Sakamoto T  Shinriki T  Honda H  Kobayashi M
Abstract:Long-term dc drift of lithium niobate optical intensity modulators is successfully reduced by exclusion of OH(-)ions from the lithium niobate substrate. In this regard, the titanium-indiffused waveguide is prepared on a commercial OH-free substrate under a dry gas atmosphere.The dc drift measured for these hermetically sealed modulators indicates a possibility for continuous operation over 20 years at 50°C.
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