[1] [1] Okamoto K,Takahashi H,Yasu M,et al.Fabrication of wavelength-insensitive 8×8 star coupler.IEEEPhotonics Technology Letters,1992,4(1):61～63

[2] [2] Dragone C.Efficient N×N star couplers using Fourier optics.J Lightwave Technology,1989,7(3):479～489

[3] [3] Okamoto K,Takahashi H,Suzuki S,et al.Design and fabrication of integrated-optic 8×8 star coupler.Electron Lett,1989,27(9):241～243

[5] [5] Ilie I,Scarmozzino R,Osqood R M.Investigation of the Padé approximation-based wide-angle beam propagationmethod for accurate modeling of waveguide circuits.J of Lightwave Technology,1996,14(12):2813～2822

[6] [6] Rappaport C M.Perfectly matched absorbing boundary conditions based on anisotropic lossy mapping of space.IEEEMicrowave Guided Wave Lett,1995,5(3):90～92