Author(s): Huang, XR (Huang, Xingrui); Liu, Y (Liu, Yang); Li, ZZ (Li, Zezheng); Guan, H (Guan, Huan); Wei, QQ (Wei, Qingquan); Yu, ZG (Yu, Zhiguo); Li, ZY (Li, Zhiyong)

Source: IEEE PHOTONICS JOURNAL Volume: 13 Issue: 2 DOI: 10.1109/JPHOT.2021.3066159 Published: APR 2021

Abstract: In this paper, we present a novel transmission line architecture in thin-film lithium niobate (TFLN) platforms to improve the velocity match between the microwave and the optical wave. Compared to conventional coplanar waveguide (CPW), the microwave index (n(m)) of the proposed slotted electrodes can be optimized from 2.1 to 3 while maintaining the high modulation efficiency and 50-Omega impedance match. Equivalent-circuit model analysis and finite-element simulation are performed. The simulated half-wave voltage (V-pi) of 1.2 V and E-O modulation bandwidth greater than 80 GHz is obtained for a 2-cm-long modulator. By utilizing the slotted slow-wave electrode, TFLN Mach-Zehnder modulators with CMOS-compatible operating voltage and 3-dB modulation bandwidth greater than 100 GHz are potentialized.

Accession Number: WOS:000749918100001

Author Identifiers:

Author Web of Science ResearcherID ORCID Number

Li, Zezheng 0000-0003-1088-8667

Huang, Xingrui 0000-0003-0192-7193

0000-0002-8041-7062

ISSN: 1943-0655

eISSN: 1943-0647

Full Text: https://ieeexplore.ieee.org/document/9378945