[1] Okamura H, Iwatsuki K. A finesee-enhanced Er-doped fiber ring resnoator. IEEE J. Lightwave Technol., 1991, 9(11):1554～1556

[2] Park N, Dawson J W, Vahala K J. All fiber, low threshold, widely tunable single-frequency, erbium-doped fiber ring laser with a tandem fiber Fabry-Perot filter. Appl. Phys. Lett., 1991, 59(19):2369～2371

[3] Okamura H, Iwatsuki K. Ultrahigh-finesse, bidirectional Er+-doped fiber ring resonator. Electron. Lett., 1992, 28(3):326～327

[4] Paul T J, Swanson E A. Narrow-linewidth diode laser using a fiber-optic ring resonator. Opt. Lett., 1993, 18(15):1241～1243

[5] Chew Y H, Tjhung T T, Mendis F V C. An optical filter of adjustable finesse using an amplified fiber ring resonator. J. Lightwave Technol., 1997, 15(2):364～370

[6] Stokes L F, Chodorow M, Shaw H J. All-single-mode fiber resonator. Opt. Lett., 1982, 7(6):288～290

[7] Ioannidis Z K, Radmore P M, Giles I P. Dynamic response of an all-fiber-ring resonator. Opt. Lett., 1988, 13(5):422～424

[8] Urquhart P. Transversely coupled fiber Fabry-Perot resonator: Theory. Appl. Opt., 1987, 26(3):456～463

[9] Zhang Jianluo, Lit J W Y. Compound fiber ring resonator: Theory. J. Opt. Soc. Am. (A), 1994, 11(6):1867～1873

[10] Zhang Jianluo, Lit J W Y. All-fiber compound ring resonator with a ring filter. J. Lightwave Technol., 1994, 12(7):1256～1262

[11] Born M, Wolf E. Principles of Optics. Oxford: Pergamon Press, 1980. 500, 503