Work

Adjoint shape optimization and experimental demonstration of silicon-based 1 × 2 mode splitter

Year: 2025

Type: article

Abstract: In this paper, we propose and experimentally demonstrate an ultra-compact silicon-based mode splitter via adjoint-based shape optimization. The proposed device can provide efficient TE 0 and TE 1 mode separation while preserving the mode order. By employing an adjoint optimization algorithm, a complex yet fabricable silicon-silica structure was generated within a functional area of 5.5 µm × 4 µm, overcoming limitations of conventional devices such as a large footprint and restricted bandwidth. Experimental results show an operating bandwidth exceeding 130 nm, with insertion loss below 2.5 dB and crosstalk under -10 dB. Leveraging the high integration density and performance advantages afforded by inverse design, the proposed mode splitter offers a flexible and low-loss mode-routing solution for on-chip mode-division multiplexing systems.

Source: Optics Express

DOI: 10.1364/oe.580386

Authors: Weifeng Jiang, Zhongcheng Yang, Tao Chen, Siwei Sun

Institution: Nanjing University of Posts and Telecommunications

Language: English

Topic: Photonic and Optical Devices

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: National Natural Science Foundation of China, State Key Laboratory of Advanced Optical Communication Systems and Networks, Startup Foundation for Introducing Talent of Nanjing University of Information Science and Technology