[1] [1] R. Wyatt, W. J. Devlin. 10 kHz linewidth 1.5 μm InGaAsP external cavity laser with 55 nm tuning range. Electron. Lett., 1983, 19(3): 110～112

[2] [2] E. Brinkmeyer, W. Brennecke, M. Zürn et al.. Fibre Bragg reflector for mode selection and line-narrowing of injection lasers. Electron. Lett., 1986, 22(3): 134～135

[3] [3] C. A. Park, C. J. Rowe, D. C. J. Reid et al.. Single-mode Behaviour of a multimode 1.55 μm laser with a fibre grating external cavity. Electron. Lett., 1986, 22(21): 1132～1134

[4] [4] K.-Y. Liou, Y. K. Jhee, G. Eisenstein et al.. Linewidth charactersitics of fiber-extended-cavity distributed-feedback lasers. Appl. Phys. Lett., 1986, 48(16): 1039～1041

[5] [5] C. J. Rowe, I. Bennion, D. C. J. Reid. High-reflectivity surface-relief gratings in single-mode optical fibers. IEE Proceedings, 1987, 134(3): 197～202

[6] [6] C. H. Henry. Theory of the linewidth of semicoductor lasers. IEEE J. Quant. Electron., 1982, QE-18(2): 259～264

[7] [7] E. Patzak, A. Sugimura, S. Saito et al.. Semiconductor laser linewidth in optical feedback configurations. Electron. Lett., 1983, 19(24): 1026～1027

[8] [8] C. H. Henry. Theory of spontaneous emission noise in open resonators and its application to lasers and optical amplifiers. IEEE J. Lightwave Technology, 1986, LT-4(3): 288～297