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Compact Racetrack Resonator on LiNbO~3~ by Pan, Bingcheng; Tan, Ying; Chen, Pengxin; Liu, Liu; Shi, Yaocheng; Dai, Daoxin is a Engineering article available to read on EtoBox.

What is Compact Racetrack Resonator on LiNbO~3~ about?

A small all-pass racetrack resonator with a large free spectral range (FSR) is proposed and designed with a 600-nmthick LiNbO3-on-insulator (LNOI) optical waveguide. It is shown that intermode crosstalk happens in LiNbO3 waveguide bends because more than one modes are generated from the anisotropy of LiNbO3. A sharp LNOI waveguide arc-bend is realized theoretically by choosing the geometrical parameters optimally to achieve constructive interference between the excited modes. This is very useful to realize compact resonators on LNOI. In particular, a novel racetrack resonator with a straight coupling region as well as Euler-bends is proposed. Here the narrow straight waveguides are introduced in the coupling region so that sufficient coupling between the access waveguide and the resonator is achieved within a short length. Euler-bends are introduced to avoid modemismatching at the junction between the straight-bent sections. For the designed LNOI racetrack resonator with an equivalent bending radius of 18 μm, the free-spectral range (FSR) is as large as 5.8 nm, and the Q-factor is 6.5 ×10 5 when assuming that the LNOI waveguide has a propagation loss of 1 dB/cm.

Who reads Compact Racetrack Resonator on LiNbO~3~?

Author

Pan, Bingcheng; Tan, Ying; Chen, Pengxin; Liu, Liu; Shi, Yaocheng; Dai, Daoxin

Publisher

Optical Society of America; Institute of Electrical and Electronics Engineers; Institute of Electrical and Electronics Engineers (IEEE) (ISSN 0733-8724)

Published

2021

Language

XH

Field

Engineering (Physical Sciences)