.Length reduction factor of tapered multimode interference devices[J].Optoelectronics Letters,2007,3(4):254-256 Length reduction factor of tapered multimode interference devices WANZhu-jun WUYa-ming [1]StateKeyLaboratoryofTransducertechnology,ShanghaiInstituteofMicrosystemandInformationTechnology,ChineseAcademyofSciences,Shanghai200050,China [2]GraduateSchooloftheChineseAcademyofSciences,Beijing100049,China Abstract:       Multimode interference (MMI) devices are widely used in planar lightwave circuit (PLC). The device length can be well reduced with tapered multimode region. Traditional design formula shows large error for MMI devices based on weaklyrestricted waveguide. Based on the analysis with mode width as a substitution of waveguide width, a design formula with better precision was presented. Comparison with software simulation verified its exactness. Hits: 3739 Download times: 190 View Full Text    Download reader