[1] Bachmann M, Nadler Ch, Besse P A, et al. Compact polarization-insensitive multi-leg 1×4 Mach-Zehnder switch in InGaAsP/InP. in Proceedings of the European Conference on Optical Communication(Delft U. Press, Delft, The Netherlands) 1995. 519～522

[2] Dam C V, Amersfoort M R, Kate G M,et al.Novel InP-based phased-array wavelength demultiplexer using a generalized MMI-MZI configuration. In Proceedings of the European Conference on Integrated Optics(Istituto Internationale delle Communicazioni, Genova, Italy) , 1994.275～278

[3] Lagali N S, Paiam M R, Macdonald R I. Theory of variable-ratio power splitters using multimode interference couplers.IEEE Photon Techno Lett,1999,11(6):665～667

[4] Lierstuen L O, Sudb A. 8-channel wavelength division multiplexer based on multimode interference couplers. IEEE Photo Technol Lett,1995,7(9):1024～1036

[5] Paiam M R , MacDonal R I. A 12-channel phase-array wavelength multiplexer with multimode interference couplers. IEEE Photo Technol Lett, 1998,10(2):241～243

[6] Porque J, Coudray P, Charters R, et al. WDM based on multimode interference-coupler built in an organic-inorganic material. Opt Commun, 2000,83:45～49

[7] Ma H, Yang J, Jiang X, et al. 8-channel arrayed-wavelength grating multi/demultiplexers based on multimode interference couplers.Acta Photonica Sinica, 2001,30(1):38～42

[8] Bryngdahl O. Image formation using self-imaging techniques. J Opt Soc Am, 1973,63(4):416～419

[9] Bachmann M,Besse P A, Melchior H. General self-imaging properties in N×N multimode interference couplers including phase relations. Appl Opt,1994, 33(18):3905～3911

[10] Bachmann M, Besse P A, Melchior H. Overlapping-image multimode interference couplers with a reduced number of self-images for uniform and nonuniform power splitting. Appl Opt,1995,34(30):6898～6910

[11] Thoen E R, Molter L A, Donnelly J P. Exact modal analysis and optimization of N×N×1 cascaded waveguide structures with multimode guiding sections. IEEE J Quant Electron,1997, 33(8):1299～1307

[12] Paiam M R, MacDonal R I. Design of phased-array wavelength division multiplexers using multimode interference couplers. Appl Opt,1997, 36(21):.5097～5108

[13] Goyal I C, Gallawa R L, Ghatak A K. Bent Planar waveguides and whispering gallery modes: A new method of analysis. J Lightwave Technol,1990,8(5):768～773