In-Band OSNR Monitor Based on 3 × 3 Si-wire MMI Coupler
Ken Tanizawa, Keisuke Sorimoto, Keijiro Suzuki, Kazuhiro Ikeda, Shu Namiki, and Hitoshi Kawashima
Technical Digest of 41st European Conference on Optical Fiber Communications (ECOC 2015)
Th.1.5.6