[1] Soldano L. B., Pennings E. C. M.. Optical multi-mode interference devices based on self-imaging: Principles and applications［J］. J. Lightwave Technol., 1995, 13(4): 615～627
[2] Wu Zhigang, Zhang Weigang, Wang Zhi et al.. Tapered multimode interference combiners for coherent receivers［J］. Chin. J. Semicond., 2006, 27(2): 328～335
[3] Amir Hosseini, John Covey, David N. Kwong et al.. Tapered multi-mode interference couplers for high order mode power extraction［J］. J. Opt., 2010, 12(7): 075502
[4] Kehinde A., Latunde-Dada, Frank P. Payne. Theory and design of adiabatically tapered multimode interference couplers［J］. J. Lightwave Technol., 2007, 25(3): 834～839
[5] P. P. Sahu. Compact multimode interference coupler with tapered waveguide geometry［J］. Opt. Commun., 2007, 277(2): 295～301
[6] Yan Qingfeng, Yu jinzhong, Liu Zhongli. Design and fabrication of ultracompact 3-dB MMI coupler in silicon-on-insulator［J］. Chin. J. Semicond., 2003, 24(2): 133～136
[7] Xiao Jinbiao, Liu Xu, Cai Chun et al.. Semi-vectorial analysis of a compact wavelength demultiplexer based on the tapered multimode interference coupler［J］. Chin. Phy., 2007, 16(7): 2015～2022
[9] M. Bachmann, P. A. Besse, H. Melchior. General selfimaging properties in N×N multimode interference couplers including phase relations［J］. Appl. Opt., 1994, 33(18): 3905～3910
[10] Sun Yiling, Jiang Xiaoqing, Wang Minghua. Analysis of general self-imaging positions in multimode interference couplers［J］. Acta Optica Sinica, 2004, 24(6): 759～762
[11] T. Rasmussen, J. K. Rasmussen, J. H. Povlsen. Design and performance evalution of 1-by-64 multimode interference power splitter for optical communications［J］. J. Lightwave Technol., 1995, 13(10): 2069～2074
[12] Shuhao Fan, Daniel Guidotti, Hungchang Chien et al.. Compact polymeric four-wavelength multiplexers based on cascaded step-size MMI for 1G/10G hybrid TDM-PON applications［J］. Opt. Express, 2008, 16(17): 12664～12669
[13] M. H. Ibrahim, N. M. Kassim, A. B. Mohammad et al.. A novel 1x2 multimode interference optical wavelength filter based on photodefinable benzocyclobutene (BCB 4024-40) polymer［J］. Microwave and Opt. Technol. Lett., 2007, 49(5): 1024～1028
[14] Fan Wang, Jianyi Yang, Limei Chen et al.. Optical switch based on multimode interference coupler［J］. IEEE Photon. Technol. Lett., 2006, 18(2): 421～423
[15] Jong Moo Lee, Joon Tae Ahn, Doo Hee Cho et al.. Vertical coupling of polymeric double-layered waveguides using a stepped MMI coupler［J］. ETRI Journal., 2003, 25(2): 81～88
[16] R. Ulrich, G. Ankele. Self-imaging in homogeneous planar optical waveguides［J］. Appl. Phys. Lett., 1975, 27(6): 337～339
[17] Lin Bin, Lian Hua, Jin Mengbi. Optical waveguide calculation and discussion with finite-difference beam propagation method［J］. Chinese J. Lasers, 2004, 31(S): 503～506
