[1] Schibli T R, Kim J, Kuzucu O et al. Attosecond active synchronization of passively mode-locked lasers by balanced cross correlation[J]. Optics Letters, 28, 947-949(2003).

[2] Tian H C, Song Y J, Ma C Y et al. Timing and carrier envelope phase synchronization from two independent femtosecond lasers[J]. Chinese Journal of Lasers, 43, 0801003(2016).

[3] Xin M, Şafak K, Peng M Y et al. Attosecond precision multi-kilometer laser-microwave network[J]. Light: Science & Applications, 6, e16187(2016).

[4] Xin M. High-precision timing synchronization techniques in large-scale scientific facilities[J]. Chinese Journal of Lasers, 47, 0500007(2020).

[5] Kim J, Chen J, Zhang Z et al. Long-term femtosecond timing link stabilization using a single-crystal balanced cross correlator[J]. Optics Letters, 32, 1044-1046(2007).

[6] Callahan P T, Safak K, Battle P et al. Fiber-coupled balanced optical cross-correlator using PPKTP waveguides[J]. Optics Express, 22, 9749-9758(2014).

[7] Jones B, Hawthorne T, Battle P et al. Development of a waveguide-based optical cross-correlator for attosecond timing synchronization[J]. Proceedings of SPIE, 10606, 1060601(2018).

[8] Şafak K, Dai A N, Xin M et al. Extreme-timing-resolution with waveguide-based balanced optical cross-correlators[C], 1-2(2022).

[9] Boes A, Corcoran B, Chang L et al. Status and potential of lithium niobate on insulator (LNOI) for photonic integrated circuits[J]. Laser & Photonics Reviews, 12, 1700256(2018).

[10] Zhu D, Shao L B, Yu M J et al. Integrated photonics on thin-film lithium niobate[J]. Advances in Optics and Photonics, 13, 242-352(2021).

[11] Boes A, Chang L, Langrock C et al. Lithium niobate photonics: unlocking the electromagnetic spectrum[J]. Science, 379, eabj4396(2023).

[12] Deng L, Gao R H, Guan J L et al. Research progress in nonlinear optics of thin-film lithium niobate micro/nano structures (invited)[J]. Laser & Optoelectronics Progress, 61, 1116011(2024).

[13] Liu Y K, She X, Liu H S et al. Low-loss apodized grating couplers based on lithium niobate on insulator[J]. Acta Optica Sinica, 43, 1913001(2023).

[14] Cheng Y. Thin film lithium niobate electro-optic devices and ultralarge-scale photonic integration (invited)[J]. Chinese Journal of Lasers, 51, 0119001(2024).

[15] Feng X K, Chen H X, Chen J Y et al. Study of fiber-coupled periodically poled lithium niobate thin film waveguide devices[J]. Chinese Journal of Lasers, 50, 2208001(2023).

[16] Wang C, Langrock C, Marandi A et al. Ultrahigh-efficiency wavelength conversion in nanophotonic periodically poled lithium niobate waveguides[J]. Optica, 5, 1438-1441(2018).

[17] Ding W J, Zhang Y T, Qiu J et al. Efficient nonlinear frequency conversion in microscale thin-film lithium niobate ridge waveguides (invited)[J]. Acta Optica Sinica, 44, 1513006(2024).

[18] Rao A, Abdelsalam K, Sjaardema T et al. Actively-monitored periodic-poling in thin-film lithium niobate photonic waveguides with ultrahigh nonlinear conversion efficiency of 4600% W-1 cm-2[J]. Optics Express, 27, 25920-25930(2019).

[19] Okayama H, Onawa Y, Shimura D et al. Si wire waveguide polarisation-independent wavelength filter using polarisation rotation Bragg grating[J]. Electronics Letters, 50, 1477-1479(2014).

[20] Okayama H, Onawa Y, Shimura D et al. Polarization rotation Bragg diffraction using Si wire waveguide grating and polarization rotator[J]. Optics Express, 23, 19698-19704(2015).

[21] Okayama H, Onawa Y, Shimura D et al. Polarization rotation Bragg grating using Si wire waveguide with non-vertical sidewall[J]. Optics Express, 22, 31371-31378(2014).

[22] Yun H, Chen Z T, Wang Y et al. Polarization-rotating, Bragg-grating filters on silicon-on-insulator strip waveguides using asymmetric periodic corner corrugations[J]. Optics Letters, 40, 5578-5581(2015).

[23] Pimbi D, Hasan M, Borhan Mia M et al. Polarization-independent photonic Bragg grating filter with cladding asymmetry[J]. Optics Letters, 48, 1192-1195(2023).

[24] Xiang Y X, Zhan B Y, Zhang H X et al. Machine learning-assisted dispersion engineering for predicting ultra-flat soliton microcombs[J]. Optics Communications, 581, 131622(2025).

[25] Chang Z Y, Zhang H X, Zhan B Y et al. Low half-wave voltage cross-waveguide phase modulator on thin-film lithium niobate platforms (invited)[J]. Laser & Optoelectronics Progress, 61, 1913018(2024).

[26] Zhan B Y, Zhang H X, Liu X W. Inverse design of high-efficiency lithium-niobate-on-insulator grating couplers with user-defined apodization[J]. Optics Express, 33, 11221-11230(2025).

[27] Lu J J, Surya J B, Liu X W et al. Periodically poled thin-film lithium niobate microring resonators with a second-harmonic generation efficiency of 250,000%/W[J]. Optica, 6, 1455-1460(2019).

[28] Chen J Y, Tang C, Ma Z H et al. Efficient and highly tunable second-harmonic generation in Z-cut periodically poled lithium niobate nanowaveguides[J]. Optics Letters, 45, 3789-3792(2020).

[29] Al Sayem A, Wang Y B, Lu J J et al. Efficient and tunable blue light generation using lithium niobate nonlinear photonics[J]. Applied Physics Letters, 119, 231104(2021).