PMID- 38294372 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20240131 IS - 1539-4522 (Electronic) IS - 1559-128X (Linking) VI - 63 IP - 3 DP - 2024 Jan 20 TI - Equivalent circuit model of the traveling wave electrode for lithium niobate thin film Mach-Zehnder modulators. PG - 617-623 LID - 10.1364/AO.509361 [doi] AB - We propose an equivalent circuit model of the traveling wave electrode for lithium niobate thin film (TFLN) Mach-Zehnder modulators, in which the distributed capacitance and conformal mapping techniques are applied to calculate the microwave refractive index, microwave loss, and characteristic impedance. Their accuracies are verified by comparing with the results of the finite element method, and the relative errors are less than 3.282%, 1.776%, and 5.334%, respectively. The influence of the electrode's structural parameters on the modulation performances is analyzed, and a 3 dB modulation bandwidth around 84 GHz with an 8-mm-long traveling wave electrode is obtained. FAU - Guo, Yanting AU - Guo Y FAU - Li, Lianyan AU - Li L FAU - Zhang, Yunshan AU - Zhang Y FAU - Sun, Shiyuan AU - Sun S FAU - Quan, Qihong AU - Quan Q FAU - Shi, Yuechun AU - Shi Y LA - eng PT - Journal Article PL - United States TA - Appl Opt JT - Applied optics JID - 0247660 SB - IM EDAT- 2024/01/31 12:44 MHDA- 2024/01/31 12:45 CRDT- 2024/01/31 10:23 PHST- 2024/01/31 12:45 [medline] PHST- 2024/01/31 12:44 [pubmed] PHST- 2024/01/31 10:23 [entrez] AID - 545518 [pii] AID - 10.1364/AO.509361 [doi] PST - ppublish SO - Appl Opt. 2024 Jan 20;63(3):617-623. doi: 10.1364/AO.509361.