High-efficiency mode converters compatible with different mode fields for thin film lithium niobate

Jinlong Lu; Ting Hao; Zhihao Li; Dennis Zhou; Guijun Ji; Xinglong Wang

doi:10.1117/12.3006735

21 December 2023 High-efficiency mode converters compatible with different mode fields for thin film lithium niobate

Jinlong Lu, Ting Hao, Zhihao Li, Dennis Zhou, Guijun Ji, Xinglong Wang

Proceedings Volume 12966, AOPC 2023: AI in Optics and Photonics ; 129661B (2023) https://doi.org/10.1117/12.3006735
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

A filling material based on a similar refractive index with SiN is designed as the mode converter for thin film lithium niobate (TFLN). Such a design can realize an output mode field compatible with different sizes ranging from 3.5 um-9.2 um. The double-layer mode converter core with SiN has a similar height as the ridge waveguide of TFLN, which is helpful to increase the conversion efficiency. An overall coupling loss of less than 0.6 dB was achieved theoretically at 1310 nm for both modes. The proposed scheme avoids the disadvantage of high reflection when the inclined TFLN section result from dry-etching is directly used as the coupling end face and can improve the performance of integrated TFLN electro-optic modulation on the chip level. Three-dimensional simulation results show that the designed structure is insensitive to fabrication tolerance, which provides a feasible solution for reducing the volume of integrated devices, increasing overall performance and high-density integration.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jinlong Lu, Ting Hao, Zhihao Li, Dennis Zhou, Guijun Ji, and Xinglong Wang "High-efficiency mode converters compatible with different mode fields for thin film lithium niobate", Proc. SPIE 12966, AOPC 2023: AI in Optics and Photonics , 129661B (21 December 2023); https://doi.org/10.1117/12.3006735

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Waveguides

Design and modelling

Fabrication

Lithium niobate

Thin films

Beam diameter

Dry etching

Show All Keywords

Keywords/Phrases

Search In:

Publication Years