[D-8-2] Loss Measurement of Multiple Layer a-Si Waveguides toward 3D Si-Optical Circuits J. H. Kang1, K. Inoue1, Y. Atsumi1, N. Nishiyama1, S. Arai1 (1.Tokyo Tech , Japan) https://doi.org/10.7567/SSDM.2010.D-8-2