[1] Mortimore D B. Fiber loop reflectors. J. Lightwave Technol., 1988, 6(7):1217～1224

[2] Lee K S, Shu C. Optical loop mirror multiplexer. IEEE Photon. Technol. Lett., 1995, 7(12):1444～1446

[3] Ja Y H. Optical fiber filter comprizing a sagnac-coupler fiber ring (or loop) and a double-coupler fiber mirror. J. Lightwave Technol., 1994, 12(8):1504～1509

[4] Dong X P, Li Shenping, Chiang K S et al.. Mulitiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror. Electron. Lett., 2000, 31(19):1609～1610

[5] Li Shenping, Chiang K S, Gambling W A. Generation of wavelength-tunable single-mode picosecond pulses from a self-seeded gain-switched Fabry-Perot laser diode with a high-birefringence fiber loop mirror. Appl. Phys. Lett., 2000, 76(25):3676～3678

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

[7] Fu Libin, An Honglin, Xu Wanjjin et al.. All-fiber Morrow-band grating assisted Sagnac transmission filter. Chin. J. Lasers, 2000, B9(4):308～312 (in Chinese)

[8] Jinno M, Matsumoto T. Nonlinear Sagnac interferometer switch and its applications. IEEE J Quant. Electron., 1992, 28(3):875～878

[9] Vengsarkar A M, Coben L G. Theoretical analysis of highly elliptical core optical fibers with arbitrary refractive-index profiles. Opt. Lett., 1992, 17(23):1656～1660

[10] Kumar A, Varshney R K. Propagation characteristics of dual-mode elliptical-core optical fibers. Opt. Lett., 1989, 14(15):817～819