论文部分内容阅读
Optical scattering loss coefficient of multimode rectangularwaveguide is analyzed in this work.First,the effective refrac-tive index and the mode field distribution of waveguide modesare obtained using the Marcatili method.The influence onscattering loss coefficient by waveguide surface roughness isthen analyzed.Finally,the mode coupling efficiency for theSMF-Optical-Waveguide(SOW)structure and MMF-Optical-Waveguide(MOW)structure are presented.The total scatter-ing loss coefficient depends on modes scattering loss coeffi-cients and the mode coupling efficiency between fiber andwaveguide.The simulation results show that the total scatter-ing loss coefficient for the MOW structure is affected morestrongly by surface roughness than that for the SOW struc-ture.The total scattering loss coefficient of waveguide decreas-es from 3.97×10-2 d B/cm to 2.96×10-4 d B/cm for theSOW structure and from 5.24×10-2 d B/cm to 4.7×10-4 d B/cm for the MOW structure when surface roughness is from300nm to 20nm and waveguide length is 100cm.
Optical scattering loss coefficient of multimode rectangular wave guide is analyzed in this work. First, the effective refrac-tive index and the mode field distribution of waveguide modes obtained obtained by the Marcatili method. Influence onscattering loss coefficient by waveguide surface roughness is analyzed. mode coupling efficiency for the SMF-Optical-Waveguide (SOW) structure and MMF-Optical-Waveguide (MOW) structures are presented. The total scatter-ing loss coefficient depends on modes scattering loss coeffi- cients and the mode coupling efficiency between fiber and waveguide. The simulation results show that the total scatter-loss loss coefficient for the MOW structure is more affected by surface roughness than that for the SOW strucure. The total scattering loss coefficient of the waveguide decreas-es from 3.97 × 10-2 d B / cm to 2.96 × 10-4 d B / cm for the SWO structure and from 5.24 × 10-2 d B / cm to 4.7 × 10-4 d B / cm for the MOW structure when surface roughness is from 300 nm t o 20nm and waveguide length is 100cm.