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An optical sampling system has been improved to provide time resolution below 1 ps and a 22.5 nm wavelength bandwidth by using a periodically poled lithium niobate crystal. An eye diagram for a 10 Gbit/s optical signal could be obtained at 1 mW peak power, and a 160 Gbit/s optical signal could also be observed clearly.
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Nogiwa et al. (2000) studied this question.
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