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Minghua Cao, Jianqiang Li, Yitang Dai, Feifei Yin, Kun Xu
A bandpass sampling based digital coherent receiver is presented for phase modulated radio-over-fiber links with coherent detection. In the scheme, the bandpass sampling technique is introduced in RoF systems to overcome the high sampling rate requirement and front-end hardware dependency of conventional digtal coherent receivers. In particular, the selection rule of bandpass sampling rate was defined by taking into account the frequency offset induced by free-running optical local oscillator. Analytical assessment and simulations are used to determine the ultimate performance in terms of tolerances to ADC bit resolution and laser linewidth...
November 3, 2014: Optics Express
X Y Zhang, C Y Yang, J X Gao, Z Q Ding
It is the first step that the data about relative teeth's shape are catched for CAD/CAM system in dental rehabilitation.That is how to measure the teeth's shape.The digtal speckle correlation method are introduced to measure the teeth's shape in the article.For one posterior tooth,we measured the five surfaces that the occlusal surface and the four axial surfaces.According to some special marks,we changed the five group's local data into one coordinate and reconstructed the three dimensional shape of the tooth...
June 1997: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
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