Polarization-independent, lithium-niobate-on-insulator directional coupler based on a combined coupling-sections design
Author(s): Zhang, L (Zhang, Lei); Fu, X (Fu, Xin); Yang, L (Yang, Lin)
Source: APPLIED OPTICS Volume: 59 Issue: 28 Pages: 8668-8673 DOI: 10.1364/AO.401413 Published: OCT 1 2020
Abstract: We have proposed a polarization-independent directional coupler (DC) by using sections with optimal coupling strength designs on the lithium-niobate-on-insulator platform. With this design, arbitrary polarization-independent coupling ratio ranging from 0% to 100% can be achieved by tuning the length of the identical coupling region. The DC exhibits ultralow excess losses (<0.1 dB) and polarization-dependent losses (<0.05 dB for the complete coupling) over a bandwidth of 100 nm. Moreover, the proposed DC is compact in size, simple in structure, and easy to fabricate. (C) 2020 Optical Society of America
Accession Number: WOS:000577161400019
PubMed ID: 33104548
ISSN: 1559-128X
eISSN: 2155-3165
Full Text: https://www.osapublishing.org/ao/abstract.cfm?uri=ao-59-28-8668
