Electro-optically tunable optical delay line with a continuous tuning range of ∼220 fs in thin-film lithium niobate

• DOI: 10.1364/ol.486117
• Publication Date: 2023-03-23T20:00:43Z
• Authors: Lvbin Song; Jinming Chen; Rongbo Wu; Yong Zheng; Zhaoxiang Liu; Guanhua Wang; Chao Sun; Min Wang; Ya Cheng
• Keywords: 0103 physical sciences; 01 natural sciences; 7. Clean energy

We demonstrate fabrication of a 30-cm-long thin-film lithium niobate (TFLN) optical delay line (ODL) incorporated with segmented microelectrodes 24-cm total length using the femtosecond laser lithography technique. The transmission spectra unbalanced Mach-Zehnder interferometers (MZIs) reveal an ultra-low propagation loss 0.025 dB/cm. device exhibits low half-wave voltage 0.45 V, corresponding to voltage-length product 10.8 V·cm, which is equivalent 5.4 V·cm in push-pull configuration. also high electro-optic (EO) tuning efficiency 3.146 fs/V and continuous range 220 fs fabricated ODL.