Truong, D. C., D. A. Vu, and C. V. Hoang. “Two Mode - (De)muxer Based on a Symmetric Y Junction Coupler, a \(2\times 2\) MMI Coupler and a Ridge Phase Shifter Using Silicon Waveguides for WDM Applications”. Communications in Physics, vol. 27, no. 4, Dec. 2017, p. 327, doi:10.15625/0868-3166/27/4/10883.