Abstract

Mode-order conversion devices can provide a flexible platform to achieve mode coupling and optimizing in mode division multiplex (MDM) that can eliminate the restrain of capacity and density in photonic integration and communication. However, mode-order converters based on traditional photonic crystal (PC) waveguides are susceptible to defects, which always render device incapacitation in mode-order conversion. Herein, a mode converter designed by the Mach–Zehnder interferometer (MZI) structure is proposed to manipulate the conversion of topological edge states (TESs) based on Chern insulators consisting of gyromagnetic PCs. The back-and-forth conversion between fundamental and high-order modes is numerically demonstrated based on phase modulation in our proposed device, in which each mode can be immune to defects. This unique approach for converting the mode order of TES exploits a new perspective in MDM to design a high-performance multimode device, leading to potential applications in photonic integrated circuits (PIC), on-chip processors, and optical fiber communication.

© 2023 Optica Publishing Group

Beam recirculation and mode-order conversion via compact Mach–Zehnder–Fano interferometers

Ibrahim Halil Giden
Opt. Lett. 47(19) 4961-4964 (2022)

Multimode optical switch based on cascaded Mach–Zehnder interferometer waveguides

Shijie Sun, Yuanhua Che, Yuhang Xie, Qidong Yu, Fei Wang, Xibin Wang, and Daming Zhang
Opt. Lett. 48(20) 5336-5339 (2023)

Broadband mode switch based on a three-dimensional waveguide Mach–Zehnder interferometer

Quandong Huang, Wei Jin, and Kin Seng Chiang
Opt. Lett. 42(23) 4877-4880 (2017)

Ultraviolet sensing based on an in-fiber ZnO microwire constructed Mach–Zehnder interferometer

Chen Chen, Ying Wang, Han Liu, Yubin Deng, Xun Wu, Changrui Liao, Xiaoyu Weng, Liwei Liu, Junle Qu, and Yiping Wang
Opt. Lett. 48(24) 6573-6576 (2023)

Modified Mach–Zehnder interferometer for spatial coherence measurement

F. J. Torcal-Milla, J. Lobera, E. M. Roche, A. M. Lopez, V. Palero, N. Andres, and M. P. Arroyo
Opt. Lett. 48(12) 3127-3130 (2023)