A (1,1) Padé-operator-based fourth-order accurate finite-difference beam-propagation method is described for the analysis of the transverse-magnetic (TM) wave, with an emphasis on power conservation. As an application, a polarization splitter with a multilayer filter is analyzed. Reflectivities of more than 98% for the transverse-electric wave and transmissivities of more than 94% for the TM wave are obtained over a wide wavelength range of 1.1-1.65 m.Index Terms-Beam-propagation method (BPM), finitedifference time-domain (FDTD) method, multilayer filter, optical waveguide, polarization splitter.

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Wind energy for electric power generation was estimated around all over the Japanese coastal area. Observed wind data every 2 hours for four years at twenty-nine stations were acquired by using the Nationwide Ocean Wave information network for Ports and HarbourS (NOWPHAS) system. Results of the observed wind statistical analysis showed that wind characteristics on seas are much more suitable for the power plants than ones on lands.