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Synchronous sampling allows alternating current (AC) quantities, such as the root mean square (RMS) values of voltage and power, to be determined with very low uncertainties (on the order of a few parts of 10-6 [1]). In this paper, a mathematical expression for estimating measurement uncertainties in nonideal synchronization with fundamental frequency AC signals is presented. The obtained results were compared with those obtained by measurements with a high-precision instrument used for measuring basic AC values.
Ippei SHAKE Ryouichi KASAHARA Hidehiko TAKARA Motohaya ISHII Yasuyuki INOUE Takuya OHARA Yoshinori HIBINO Satoki KAWANISHI
We demonstrate a simple BER monitoring method for WDM signals. Newly developed 32-channel wavelength selector based on thermo-optic switch and AWG is used. The BER of each channel is estimated from opened eye-diagrams obtained by asynchronous sampling. Good BER monitoring performance is confirmed.