[1] [1] Simon J C, Billes L, Bramerie L. All optical regeneration[C]// IEEE Electronic-enhanced Optics, Optical Sensing in Semiconductor Manufacturing, Electro-optics in Space, Broadband Optical Networks, Digest of the Leos Summer Topical Meetings, 2002.

[2] [2] Timko M P. Method of converting an analog signal to a digital signal: United State, 684487[P]. 1997-11-04.

[3] [3] Yaacob S S M, Shah N S M, Shamsuddin N N, et al. 10GB/S NRZ based on self-phase modulation in all optical 2R regeneration[J]. ARPN J. of Engin. and Appl. Sciences, 2015, 5(2): 1-4.

[4] [4] Tomkos I, Tzanakaki A, Leuthold J, et al. Transparent ring interconnection using multi-wavelength processing switches[C]// Proc. of 2006 Inter. Conf. on Transparent Optical Networks, 2006, 1: 23-23.

[5] [5] Leuthold J, Freude W, Sygletos S, et al. An all-optical grooming switch to interconnect access and metro ring networks[C]//Proc. of IEEE 10th Anniversary Inter. Conf. on Transparent Optical Networks, 2008, 3: 207-210.

[6] [6] Wen F, Sygletos S, Tsekrekos C P, et al. Multilevel power transfer function characterization of nonlinear optical loop mirror[C]// Proc. of IEEE 19th Inter. Conf. on Transparent Optical Networks (ICTON), 2017: 1-4.

[7] [7] Ciaramella E, Trillo S. All-optical signal reshaping via four-wave mixing in optical fibers[J]. IEEE Photon. Technol. Lett., 2000, 12(7): 849-851.

[8] [8] Ciaramella E, Curti F, Trillo S. All-optical signal reshaping by means of four-wave mixing in optical fibers[J]. IEEE Photon. Technol. Lett., 2001, 13(2): 142-144.

[9] [9] Simos H, Bogris A, Syvridis D. Investigation of a 2R all-optical regenerator based on four-wave mixing in a semiconductor optical amplifier[J]. J. of Lightwave Technol., 2004, 22(2): 595-603.

[10] [10] Keiser G. Optical Fiber Communications[M]. American Cancer Society: Wiley Encyclopedia of Telecommunications, 2003.

[11] [11] Manzoor H U, Zafar M, Manzoor S U, et al. Improving FWM efficiency in bi-directional ultra DWDM-PON networking centered light source by using PMD emulator[J]. Results in Physics, 2020, 16: 102922.