Zhang, Z., Huang, B.J., Zhang, X., Zhang, Z.Y., Cheng, C.T., Mao, X.R., Liu, S.J. and Chen, H.D. (2015) Monolithic Integration of Si3N4 Microring Filters with Bulk CMOS IC through Post-Backend Process. IEEE Photonics Technology Letters, 27, 1543-1546.