INTEGRATED OPTICAL MODE CONVERTING AND ROUTING 5-OUTPUT CHIP FOR MODE DIVISION MULTIPLEXING SYSTEMS

Nguyễn Văn Tuấn; Lê Nguyễn Minh Thuận; Lê Văn Sơn; Nguyễn Tấn Hưng; Võ Duy Phúc; Đào Duy Tuấn

doi:10.34238/tnu-jst.12219

INTEGRATED OPTICAL MODE CONVERTING AND ROUTING 5-OUTPUT CHIP FOR MODE DIVISION MULTIPLEXING SYSTEMS

About this article

Received: 05/03/25 Revised: 04/06/25 Published: 04/06/25

Authors

1. Nguyen Van Tuan , The University of Danang - Danang University of Science and Technology (DUT)
2. Le Nguyen Minh Thuan, The University of Danang - Danang University of Science and Technology (DUT)
3. Le Van Son, The University of Danang - Danang University of Science and Technology (DUT)
4. Nguyen Tan Hung, The University of Danang - Institute of Advanced Science and Technology (AIST)
5. Vo Duy Phuc, The University of Danang - Danang University of Science and Technology (DUT)
6. Dao Duy Tuan, The University of Danang - Danang University of Science and Technology (DUT)

Abstract

This paper presents a novel proposal of a device used in a mode division multiplexingsystem that integrates two functions of optical mode conversion and optical mode routing with five outputs when processing five different modes at the input. The device is designed with one 1x5-Y waveguide, one 5x5-MMI multimode interferometer and two phase shifters to route TE₀modes at 5 outputs. The device performs the function of converting 5 signal streams at the input corresponding to different modes: TE₀, TE₁, TE₂, TE₃ and TE₄ into 5 signal streams in the base mode (TE₀ mode), then routing them at 5 different outputs. The device is designed to operate at the wavelength of 1550 nm. The optimization and operation description process is performed using the three-dimensional beam propagation method (3D-BPM). Simulation results show that in the 15 nm wide range of C-band (1530 nm - 1565 nm), the proposed device has very low insertion loss, less than 0.5 dB (corresponding to transmission efficiency > 90%) and very small crosstalk, less than -14 dB (< 4%). In particular, at the wavelength of 1550 nm, the insertion loss and crosstalk could achieve better values, respectively > 94.4% and < -14.2 dB.Since the device is designed with a simple structure, including one 1x5-Y waveguide, 2 phase shifters combined with one5x5-MMI, its size could be reduced (Wmmi × Lmmi × H = 6 µm × 138 µm × 0.5 µm) and its transmission efficiency could be improved.

Keywords

Optical mode converter and router; Three-dimensional beam propagation; TE0, TE1, TE2, TE3, TE4; Insertion loss; Crosstalk

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DOI: https://doi.org/10.34238/tnu-jst.12219

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