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In this paper, we introduce a new two-mode (de)multiplexer based on the silicon-oninsulator (SOI) platform. The device is built on a symmetric Y-junction, a 2×2 multimode interference (MMI) waveguide and a phaseshifter in the form of a ridge waveguide which is designed using 3D scalar beam propagation method (BPM). The phase evolution in the structure is discussed in details. | Communications in Physics, Vol. 27, No. 4 (2017), pp. 327-338 DOI:10.15625/0868-3166/27/4/10883 TWO MODE - (DE)MUXER BASED ON A SYMMETRIC Y JUNCTION COUPLER, A 2 × 2 MMI COUPLER AND A RIDGE PHASE SHIFTER USING SILICON WAVEGUIDES FOR WDM APPLICATIONS DUNG CAO TRUONG1,† , DAO ANH VU2 AND CHUNG VU HOANG2 1 Posts and Telecommunications Institute of Technology, Hanoi, Vietnam 2 Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam † E-mail: dungtc@ptit.edu.vn Received 13 November 2017 Accepted for publication 11 December 2017 Published 31 December 2017 Abstract. In this paper, we introduce a new two-mode (de)multiplexer based on the silicon-oninsulator (SOI) platform. The device is built on a symmetric Y-junction, a 2 × 2 multimode interference (MMI) waveguide and a phaseshifter in the form of a ridge waveguide which is designed using 3D scalar beam propagation method (BPM). The phase evolution in the structure is discussed in details. The simulation results show that the device can operate in a wide wavelength range (150 nm) with a low insertion loss and small crosstalk. A large fabrication tolerance to the width of the input waveguide up to 100 nm is achieved, which is compatible to the current CMOS manufacturing technologies for the photonic integrated circuits. Furthermore, the small footprint (4 µm × 286 µm) makes the device suitable for applications in high bitrate and compact on-chip silicon photonic integrated circuits. Keywords: two-mode (de)multiplexer, symmetric Y-junction, MMI coupler, silicon on insulator (SOI), beam propagation method (BPM), effective index method (EIM). Classification numbers: 42.65.Wi; 42.82.Et; 42.65.Hw. c 2017 Vietnam Academy of Science and Technology 328 TWO MODE - (DE)MUXER BASED ON A SYMMETRIC Y JUNCTION COUPLER . . I. INTRODUCTION In the era of the rapid growth of bandwidth demands in the information networks for video on demand, cloud computing and big data, communication systems .
