[1] DAI Zh Y, ZHANG X X, PENG Z Sh, et al. A single-frequency narrow-line width fiber laser with PM fiber saturable absorber ［J］. Journal of Optoelectronics·Laser,2011,22(5):652-655(in Chinese).

[2] DONG F J,YANG X F,TONG Zh R, et al. Dual-wavelength Er-doped fiber laser based on polarization hole burning of multi-mode fiber ［J］. Journal of Optoelectronics·Laser,2011,22(6): 841-844(in Chinese).

[3] CAO Y Ch, XIONG J J, HOU Q Zh. Design of precision control systems for tunable semiconductor lasers ［J］. Laser Technology, 2015, 39(3):316-319(in Chinese).

[4] CHEN W G, LOU S Q,WANG L W, et al. Switchable dual-wavelength erbium-doped fiber laser based on the photonic crystal fiber loop mirror and chirped fiber Bragg gratting ［J］. Optoelectronics Lett-ers, 2010, 6(2):94-97.

[5] JIN L, KAI G Y, XU L L, et al. Switchable dual-wavelength erbium-doped fiber laser with a tilted fiber grating ［J］. Optoelectronics Lett-ers, 2007, 3(1):27-29.

[6] PAN Sh L, YAO J P. A wavelength-switchable single-longitudinalmode dual-wavelength erbium-doped fiber laser for switchable microwave generation ［J］.Optics Express,2009,17(7): 5414-5419.

[7] QUINTELA M A, PEREZ-HERRERA R A, CANALES I, et al. Stabilization of dual-wavelength erbium-doped fiber ring lasers by single-mode operation ［J］. IEEE Photonics Technology Letters, 2010, 22(6):368-370.

[8] PENG P C, TSENG H Y, CHI S. A tunable dual-wavelength erbium-doped fiber ring laser using a self-seeded Fabry-Perot laser diode ［J］. IEEE Photonics Technology Letters, 2003, 15(5):661-663.

[9] YAO Y, CHEN X F, DAI Y T, et al. Dual-wavelength erbium-doped fiber laser with a simple linear cavity and its application in microwave generation ［J］.IEEE Photonics Technology Letters, 2006, 18(1):187-189.

[10] PAN S L, ZHAO X F, LOU C Y. Switchable single-longitudinal-mode dual-wavelength erbium-doped fiber ring laser incorporating a semiconductor optical amplifier ［J］. Optics Letters, 2008, 33(8):764-766.

[11] RYN H Y, LEE W K, MOON H S, et al. Stable single-frequency fiber ring laser for 25GHz ITU-T grids utilizing saturable absorber filter ［J］.IEEE Photonics Technology Letters, 2005,17(9):1824-1826.

[12] ZHANG K, KANG J U. C-band wavelength-swept single-longitudinalmode erbium-doped fiber ring laser ［J］.Optics Express, 2008, 16(18):14173-14179.

[13] FANG X L, TONG Zh R, CAO Y, et al. Narrow line width ring cavity fiber laser using F-P fiber ring filter ［J］. Infrared and Laser Engineering, 2013,42(2):329-333(in Chinese).

[14] ZHANG Z X, SANG M H, YE Zh Q, et al. Multiwavelength fiber laser based on nonlinear polarization rotation ［J］. Acta Optica Sinica, 2008, 28(4): 648-652(in Chinese).

[15] PAN S L, YAO J P. Frequency-switchable microwave generation based on a dual-wavelength single-longitudinal-mode fiber laser incorporating a high-finesse ring filter ［J］. Optics Express, 2009, 17(14):12167-12173.

[16] LI B, LIU Y, ZENG Sh G, et al. Study on coherent beam combination of fiber laser array ［J］.Laser Technology, 2015, 39(5):712-716(in Chinese).