[1] Morton P A, Morton M J. High-power, ultra-low noise hybrid lasers for microwave photonics and optical sensing[J]. Journal of Lightwave Technology, 36, 5048-5057(2018).

[2] Zhao Y M, Li Y, Huang W P. Narrow-linewidth distributed feedback moiré-grating laser for high-speed optical communications[J]. Applied Optics, 59, 3666-3672(2020).

[3] Ye Q, Pan Z Q, Wang Z Y et al. Progress of research and applications of phase-sensitive optical time domain reflectometry[J]. Chinese Journal of Lasers, 44, 0600001(2017).

[4] Ip E, Lau A P T, Barros D J F et al. Coherent detection in optical fiber systems[J]. Optics Express, 16, 753-791(2008).

[5] Li W P, Kong M, Shi J T et al. Generation of multiple path wireless and wireline signals based on a single optical modulator[J]. Acta Optica Sinica, 40, 1906001(2020).

[6] Lu D, Yang Q L, Wang H et al. Review of semiconductor distributed feedback lasers in the optical communication band[J]. Chinese Journal of Lasers, 47, 0701001(2020).

[7] Kane T J, Byer R L. Monolithic, unidirectional single-mode Nd: YAG ring laser[J]. Optics Letters, 10, 65-67(1985).

[8] Yang C S, Cen X, Xu S H et al. Research progress of single-frequency fiber laser[J]. Acta Optica Sinica, 41, 0114002(2021).

[9] Numata K, Camp J, Krainak M A et al. Performance of planar-waveguide external cavity laser for precision measurements[J]. Optics Express, 18, 22781-22788(2010).

[10] Numata K, Alalusi M, Stolpner L et al. Characteristics of the single-longitudinal-mode planar-waveguide external cavity diode laser at 1064 nm[J]. Optics Letters, 39, 2101-2104(2014).

[11] Liang W, Ilchenko V S, Eliyahu D et al. Ultralow noise miniature external cavity semiconductor laser[J]. Nature Communications, 6, 7371(2015).

[12] Ilchenko V S, Dale E, Liang W et al. Compact tunable kHz-linewidth semiconductor laser stabilized with a whispering-gallery mode microresonator[J]. Proceedings of SPIE, 7913, 79131G(2011).

[13] Lin Y, Browning C, Timens R B et al. Characterization of hybrid InP-TriPleX photonic integrated tunable lasers based on silicon nitride (Si3N4/SiO2) microring resonators for optical coherent system[J]. IEEE Photonics Journal, 10, 1-8(2018).

[14] Bird D M, Armitage J R, Kashyap R et al. Narrow line semiconductor laser using fibre grating[J]. Electronics Letters, 27, 1115-1116(1991).

[15] Morton P A, Mizrahi V, Tanbun-Ek T et al. Stable single mode hybrid laser with high power and narrow linewidth[J]. Applied Physics Letters, 64, 2634-2636(1994).

[16] Pan B W, Yu L Q, Lu D et al. 20 kHz narrow linewidth fiber Bragg grating external cavity semiconductor laser[J]. Chinese Journal of Lasers, 42, 0502007(2015).

[17] Lynch S G, Holmes C, Berry S A et al. External cavity diode laser based upon an FBG in an integrated optical fiber platform[J]. Optics Express, 24, 8391-8398(2016).

[18] Zhang L, Fang W, Wang D et al. V-groove-based compact FBG package for thermal tuning and mechanical stability[J]. Applied Physics B, 122, 1-5(2016).

[19] Zhang L, Wei F, Sun G W et al. Thermal tunable narrow linewidth external cavity laser with thermal enhanced FBG[J]. IEEE Photonics Technology Letters, 29, 385-388(2017).

[20] Sun G W, Wei F, Zhang L et al. Low-noise external cavity semiconductor lasers based on polarization-maintaining fiber Bragg gratings[J]. Chinese Journal of Lasers, 45, 0601004(2018).

[21] Aoyama K, Yoshioka R, Yokota N et al. Optical negative feedback for linewidth reduction of semiconductor lasers[J]. IEEE Photonics Technology Letters, 27, 340-343(2015).

[22] Lang R, Kobayashi K. External optical feedback effects on semiconductor injection laser properties[J]. IEEE Journal of Quantum Electronics, 16, 347-355(1980).