The 650-nm variable optical attenuator based on polymer/silica hybrid waveguide
Yu Yue-Yang1, Sun Xiao-Qiang1, 2, †, 
, Ji Lan-Ting1, He Guo-Bing1, Wang Xi-Bin1, 2, Yi Yun-Ji1, 2, Chen Chang-Ming1, 2, Wang Fei1, 2, Zhang Da-Ming1, 2
, Ji Lan-Ting1, He Guo-Bing1, Wang Xi-Bin1, 2, Yi Yun-Ji1, 2, Chen Chang-Ming1, 2, Wang Fei1, 2, Zhang Da-Ming1, 2 Optical microscope image of the fabricated attenuator. The inset (a) presents the ridge waveguide structure with vertical profile of the single-mode output waveguide; inset (b) shows the cross-sectional state of multimode waveguide section by scanning electron micrograph.
