Mode-Conversion-Based Chirped Bragg Gratings on Thin-Film Lithium Niobate

In this work, we propose a mode-conversion-based chirped Bragg grating on thin-film lithium niobate (TFLN). The device is mainly composed of a 4.7-mm long chirped asymmetric Bragg grating and an adiabatic directional coupler (ADC). The mode conversion introduced by the ADC allows the chirped Bragg g...

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Bibliographic Details
Published in:Photonics
Main Authors: Donghe Tu, Xingrui Huang, Yuxiang Yin, Hang Yu, Zhiguo Yu, Huan Guan, Zhiyong Li
Format: Article
Language:English
Published: MDPI AG 2022-11-01
Subjects:
integrated photonics
thin-film lithium niobate
chirped Bragg grating
mode conversion
Online Access:https://www.mdpi.com/2304-6732/9/11/828
Description
Summary:In this work, we propose a mode-conversion-based chirped Bragg grating on thin-film lithium niobate (TFLN). The device is mainly composed of a 4.7-mm long chirped asymmetric Bragg grating and an adiabatic directional coupler (ADC). The mode conversion introduced by the ADC allows the chirped Bragg grating operates in reflection without using an off-chip circulator. The proposed device has experimentally achieved a total time delay of 73.4 ps over an operating bandwidth of 15 nm. This mode-conversion-based chirped Bragg grating shows excellent compatibility with other devices on TFLN, making it suitable in monolithically integrated microwave photonics, sensing, and optical communication systems.
ISSN:2304-6732

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