[1] L. Huang, X. Song, P. Chang, W. Peng, W. Zhang, F. Gao, F. Bo, G. Zhang, J. Xu. All-fiber tunable laser based on an acousto-optic tunable filter and a tapered fiber. Opt. Express, 24, 7449(2016).
[2] Z. Zhang, L. Zhan, Y. Xia. Tunable self-seeded multiwavelength Brillouin-erbium fiber laser with enhanced power efficiency. Opt. Express, 15, 9731(2007).
[3] S. Pan, C. Lou, Y. Gao. Multiwavelength erbium-doped fiber laser based on inhomogeneous loss mechanism by use of a highly nonlinear fiber and a Fabry–Perot filter. Opt. Express, 14, 1113(2006).
[4] Y. Li, J. Tian, M. Quan, Y. Yao. Tunable multiwavelength Er-doped fiber laser with a two-stage Lyot filter. IEEE Photon. Technol. Lett., 29, 287(2017).
[5] H. Han, X. Li, S. Zhang, M. Han. Precise wavelength control of Yb-doped fiber laser using fused tapered fiber technology. J. Lightwave Technol., 37, 715(2019).
[6] Q. Zhao, L. Pei, L. Wu, T. Ning, J. Zheng, J. Li. Wide tuning range and high OSNR self-seeded multi-wavelength Brillouin-erbium fiber laser based on a Lyot filter. Appl. Opt., 57, 10474(2018).
[7] Y. J. Song, L. Zhan, S. Hu, Q. H. Ye, Y. X. Xia. Tunable multiwavelength Brillouin–erbium fiber laser with a polarization-maintaining fiber Sagnac loop filter. IEEE Photon. Technol. Lett., 16, 2015(2004).
[8] W. Gao, M. Liao, T. Cheng, T. Suzuki, Y. Ohishi. Tunable Brillouin-erbium comb fiber laser in a linear cavity with a single-mode tellurite fiber. IEEE Photon. Technol. Lett., 25, 51(2013).
[9] X. Liu, L. Zhan, S. Luo, Y. Wang, Q. Shen. Individually switchable and widely tunable multiwavelength erbium-doped fiber laser based on cascaded mismatching long-period fiber gratings. J. Lightwave Technol., 29, 3319(2011).
[10] J. Zheng, A. Yang, T. Wang, X. Zeng, N. Cao, M. Liu, F. Pang, T. Wang. Wavelength-switchable vortex beams based on a polarization-dependent microknot resonator. Photon. Res., 6, 396(2018).
[11] B. Wang, Z. Cao, F. Ai, B. Chen, S. Zhen, X. Shi, B. Yu. Switchable quadruple-wavelength erbium-doped fiber ring laser based on two-segment Lyot–Sagnac filter. Opt. Laser Technol., 42, 357(2010).
[12] W. Wang, H. Meng, X. Wu, W. Wang, H. Xue, C. Tan, X. Huang. Three channel-spacing switchable multiwavelength fiber laser with two segments of polarization-maintaining fiber. IEEE Photon. Technol. Lett., 24, 470(2012).
[13] Q. Zhao, L. Pei, J. Zheng, M. Tang, Y. Xie, J. Li, T. Ning. Switchable multi-wavelength erbium-doped fiber laser with adjustable wavelength interval. J. Lightwave Technol., 37, 3784(2019).
[14] Z.-C. Luo, A.-P. Luo, W.-C. Xu. Tunable and switchable all-fiber comb filter using a PBS-based two-stage cascaded Mach–Zehnder interferometer. Opt. Commun., 284, 4167(2011).
[15] D. Chen, H. Ou, H. Fu, S. Qin, S. Gao. Wavelength-spacing tunable multi-wavelength erbium-doped fiber laser incorporating a semiconductor optical amplifier. Laser Phys. Lett., 4, 287(2006).
[16] D. Chen, S. Qin, S. He. Channel-spacing-tunable multi-wavelength fiber ring laser with hybrid Raman and erbium-doped fiber gains. Opt. Express, 15, 930(2007).
[17] Q. Zhao, L. Pei, J. Zheng, M. Tang, Y. Xie, J. Li, T. Ning. Switchable, widely tunable and interval-adjustable multi-wavelength erbium-doped fiber laser based on cascaded filters. J. Lightwave Technol., 38, 2428(2020).
[18] Q. Zhao, L. Pei, M. Tang, Y. Xie, Z. Ruan, J. Zheng, T. Ning. Switchable multi-wavelength erbium-doped fiber laser based on core-offset structure and four-wave-mixing effect. Opt. Fiber Technol., 54, 102111(2020).
[19] M. Han, X. Li, S. Zhang, H. Han, J. Liu, Z. Yang. Tunable and channel spacing precisely controlled comb filters based on the fused taper technology. Opt. Express, 26, 265(2018).
[20] Q. Zhao, L. Pei, J. Zheng, M. Tang, Y. Xie, J. Li, T. Ning. Tunable and interval-adjustable multi-wavelength erbium-doped fiber laser based on cascaded filters with the assistance of NPR. Opt. Laser Technol., 131, 106387(2020).
[21] L. Zeng, X. Sun, Z. Chang, Y. Hu, J. Duan. Tunable phase-shifted fiber Bragg grating based on a microchannel fabricated by a femtosecond laser. Chin. Opt. Lett., 19, 030602(2021).
[22] M. Wang, M. Liu, Y. Chen, D. Ouyang, J. Zhao, J. Pei, S. Ruan. Stable noise-like pulse generation in all-PM mode-locked Tm-doped fiber laser based on NOLM. Chin. Opt. Lett., 19, 091402(2021).
[23] H. Chen, X. Jiang, S. Xu, H. Zhang. Recent progress in multi-wavelength fiber lasers: principles, status, and challenges. Chin. Opt. Lett., 18, 041405(2020).