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We demonstrate an on-chip electro-optically tunable Fabry-Perot (FP) cavity laser on Er3+-doped thin film lithium niobate (Er: TFLN). The FP cavity consists of two Sagnac loop reflectors (SLRs) at the two ends with a loaded quality (Q) factor of 1.3 × 105 and a free spectral range (FSR) of 68 pm. The fabricated Er: TFLN FP laser structure is integrated with microelectrodes designed for electro-optically tuning, and a continuous laser wavelength tuning with 21 pm around 1544 nm is achieved by applying a driving voltage from -6V to 6 V.
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Fang et al. (2023) studied this question.