Demonstration of a scalable mode converter in lithium niobate on insulator

Optics Letters, Journal Year: 2025, Volume and Issue: 50(3), P. 876 - 876

Published: Jan. 2, 2025

Lithium niobate on insulator (LNOI) attracts extensive attention from academic and industrial communities due to LN's excellent electro-optic (EO) properties, which also brings bright prospects for achieving high-speed large-capacity photonic integrated circuits (PICs) including active passive components such as modulator, filter, multiplexer. A mode converter can implement optical conversion a fundamental high-order mode, plays key role in an on-chip mode-division multiplexing (MDM) system. In this Letter, we propose high-performance scalable converters LNOI, based our proposed principle, the be designed arbitrary mode. As proof of concept, design fabricate TE0-TEi (i = 1,2,3) converters. The experimental results show insertion loss (IL) cross talk (CT) are less than 2.5 dB -10.3 wavelength range 1525-1565 nm all fabricated devices, basically consistent with simulation results. This work great promise PICs LNOI platform future.

Language: Английский

Compact Nonvolatile Reconfigurable Mode Converter by Sb2S3 Embedded in 4H-Silicon-Carbide-on-Insulator Platform

Nanomaterials, Journal Year: 2025, Volume and Issue: 15(9), P. 689 - 689

Published: May 1, 2025

Nonvolatile switching is emerging and shows potential in integrated optics. A compact nonvolatile reconfigurable mode converter implemented on a 4H-silicon-carbide-on-insulator (4H-SiCOI) platform with footprint of 0.5 × 1 1.8 μm3 proposed this study. The functional region features an Sb2S3 film embedded 4H-SiC strip waveguide. functionality achieved through manipulating the phase state Sb2S3. high refractive index contrast between crystalline enables high-efficiency conversion within footprint. incident TM0 converted to TM1 transmittance (T) beyond 0.91 purity (MP) over 91.72% across 1500–1600 nm waveband. Additionally, when transitions its amorphous state, diminished efficiently mitigates effect. In propagates minimal perturbation, exhibiting T ≥ 0.99 MPTM0 97.65% Furthermore, device performances were investigated under partially crystallized states structure offers broad range differences (−16.42 dB ≤ ΔT 17.1 dB) (−90.91% ΔMP 96.11%) mode. exhibits robustness ±20 Δl ±10 Δw. We believe that multi-level manipulation can facilitate large communication capacity it be deployed neuromorphic optical computing.

Language: Английский

Polarization-Insensitive Lithium Niobate-on-Insulator Interferometer

Micromachines, Journal Year: 2024, Volume and Issue: 15(8), P. 983 - 983

Published: July 30, 2024

The key components of a polarization-independent electro-optic (EO) interferometer, including the beam splitter, mode converter, and directional coupler, are designed based on lithium niobate (LN) platform an integrated insulator to ensure high extinction ratios. By elaborately designing geometric structure multimode interference (MMI) splitting equal proportions coupling higher-order modes realized. most prominent characteristic proposed interferometer is polarization insensitivity, which realized by converting TM into TE using providing conditions for study light with different polarizations. At 1550 nm, visibility 97.59% 98.16% TM, respectively, demonstrating performance LN interferometer.

Language: Английский