Design of 4-channel AWG Multiplexer/demultiplexer for CWDM system

• DOI: 10.1016/j.ijleo.2019.163513
• Publication Date: 2019-10-04T14:55:22Z
• Authors: Yu Zheng; Xionghui Wu; Lianqiong Jiang; Yao Wu; Ji’an Duan
• Keywords: Demultiplexer; Arrayed waveguide grating; Channel spacing; Optical add-drop multiplexer; Crosstalk

Abstract Arrayed Waveguide Grating (AWG) for Coarse wavelength division multiplexing (CWDM) system is a key component of above 100Gb/s high-speed optical transmission module in telecommunication and interconnects for data center. Based on the theory of light transmission, the relationships between structure parameters and optical performance of AWG chip are analyzed. Four-channel AWG MUX/DEMUX chips for CWDM system at O-band are designed and simulated according to the relationships. The simulation results show that the insertion loss of the MUX is below 0.8 dB with non-uniformity of 0.07 dB. The bandwidths at 1 dB and 3 dB are more than 10 nm and 17 nm, respectively. For DEMUX, multi-mode interference (MMI) couplers are introduced at the start of output waveguides to produce flat-top spectral response with 1 dB bandwidth of 12 nm. The lowest insertion loss and adjacent crosstalk are 2.78 dB and below −20 dB, respectively.