[1] Hu L T. The study on the instability of polarization in optical fibers[D]. Shanghai: Shanghai Jiao Tong University, 20-21(2003).

[2] Liu Z J, Zhou P, Xu X J[M]. Coherent beam combining of high average power fiber laser, 172-173(2015).

[3] Liao Y B[M]. Polarization optics(2003).

[4] Xiong Y P. Study on adaptive polarization control technology of fiber amplifier[D]. Changsha: National University of Defense Technology, 2-3(2012).

[5] Goodno G D. McNaught S J, Rothenberg J E, et al. Active phase and polarization locking of a 1.4 kW fiber amplifier[J]. Optics Letters, 35, 1542-1544(2010).

[6] Goodno G D. McNaught S J, Weber M E, et al. Multichannel polarization stabilization for coherently combined fiber laser arrays[J]. Optics Letters, 37, 4272-4274(2012).

[7] McNaught S J, Thielen P A, Adams L N et al. . Scalable coherent combining of kilowatt fiber amplifiers into a 2.4 kW beam[J]. IEEE Journal of Selected Topics in Quantum Electronics, 20, 0901008(2014). http://ieeexplore.ieee.org/document/6732914/

[8] Angel F, Thomas E, Roger H et al. Multi-kW coherent combining of fiber lasers seeded with pseudo random phase modulated light[J]. Proceedings of SPIE, 9728, 97281Y(2016). http://www.spie.org/Publications/Proceedings/Paper/10.1117/12.2213423

[9] Liu Z J, Zhou P, Ma P F et al. 4-channel high power narrow linewidth, linearly polarized fiber amplifier coherent polarization beaming for 5 kW high brightness laser output[J]. Chinese Journal of Lasers, 44, 0415004(2017).

[10] Wang Y S, Yan H, Peng W J et al. 1 kW narrow linewidth linear polarization fiber laser based on active polarization control[J]. Chinese Journal of Lasers, 43, 0519001(2016).

[11] Taylor L R, Feng Y, Calia D B. 50 W CW visible laser source at 589nm obtained via frequency doubling of three coherently combined narrow-band Raman fibre amplifiers[J]. Optics Express, 18, 8540-8555(2010). http://www.ncbi.nlm.nih.gov/pubmed/20588700

[12] Wang P, Shang Y P, Li X et al. High efficient polarization-converting system based on combination of axicon and wave plate[J]. Chinese Journal of Lasers, 42, s116002(2015).

[13] Yang Y, Geng C, Li F et al. Coherent polarization beam combining approach based on polarization controlling in fiber devices[J]. IEEE Photonics Technology Letters, 29, 945-948(2017). http://ieeexplore.ieee.org/document/7898785/

[14] Yang Y, Geng C, Li F et al. Combining module based on coherent polarization beam combining[J]. Applied Optics, 56, 2020-2028(2017). http://www.ncbi.nlm.nih.gov/pubmed/28248403

[15] Geng C, Zhao B Y, Zhang E T et al. 1.5 kW incoherent beam combining of four fiber lasers using adaptive fiber-optics collimators[J]. IEEE Photonics Technology Letters, 25, 1286-1289(2013). http://ieeexplore.ieee.org/document/6516078/

[16] Li F, Geng C, Li X Y et al. Co-aperture transceiving of two combined beams based on adaptive fiber coupling control[J]. IEEE Photonics Technology Letters, 27, 1787-1790(2015). http://ieeexplore.ieee.org/document/7114234/

[17] Li W W, Zhang X M, Chen K S et al. Application of simulated annealing algorithm on endless polarization controller[J]. Acta Photonica Sinica, 34, 820-824(2005).

[18] Wang T C, Liu T G, Wan M S et al. Polarization controlment for polarization division multiplexing system[J]. Optics&Optoelectronic Technology, 6, 9-12(2008).

[19] Liu Y, Chi H, Zhang X M et al. A novel control scheme for four-plate retardation polarization controller[J]. Microwave and Optical Technology Letters, 51, 124-128(2009). http://onlinelibrary.wiley.com/doi/10.1002/mop.24011/pdf

[20] Xiong Y P, Su R T, Li X et al. Coherent beam combining based on adaptive polarization and active phase control technique[J]. High Power Laser and Particle Beams, 25, 5-6(2013).

[21] Dong S H, Wang X L, Su R T et al. Adaptive polarization conversion system of the non-polarization maintaining to polarization maintaining laser based on SPGD algorithm[J]. High Power Laser and Particle Beams, 27, 051011(2015).

[22] Su R T, Liu Y K, Yang B L et al. Active polarization control of a 1.43 kW narrow linewidth fiber amplifier based on SPGD algorithm[J]. Journal of Optics, 19, 045802(2017). http://adsabs.harvard.edu/abs/2017JOpt...19d5802S

[23] Yin M, Su R T, Wang X L et al. Theoretical and experimental research on polarization control of fiber laser based on SPGD algorithm[J]. Laser & Optoelectronics Progress, 55, 090602(2018).

[24] Anderegg J, Brosnan S J, Cheung E et al. Coherently coupled high power fiber arrays[J]. Proceedings of SPIE, 6102, 6102U(2006). http://www.opticsinfobase.org/oe/abstract.cfm?uri=ASSP-2004-MA4

[25] Hou J, Xiao R, Jiang Z F et al. Coherent beam combination of three ytterbium fiber amplifiers[J]. High Power Laser and Particle Beams, 18, 1585-1588(2006).

[26] Fan X Y, Liu J, Liu J S et al. Coherent combining of a seven-element hexagonal fiber array[J]. Optics & Laser Technology, 42, 274-279(2010). http://www.sciencedirect.com/science/article/pii/S0030399209001431

[27] Shen H, Quan Z, Yang Y F et al. Polarization control of combined laser beams based on optical homodyne polarization detection and phase locking[J]. Infrared and Laser Engineering, 47, 0103007(2018).

[28] Shay T M, Benham V. First experimental demonstration of phase locking of optical fiber arrays by RF phase modulation[J]. Proceedings of SPIE, 5550, 313-319(2004). http://www.spie.org/Publications/Proceedings/Paper/10.1117/12.597455

[29] Shay T M, Benham V, Baker J T et al. First experimental demonstration of self-synchronous phase locking of an optical array[J]. Optics Express, 14, 12015-12021(2006). http://www.opticsinfobase.org/abstract.cfm?uri=oe-14-25-12015

[30] Shay T M, Baker J T, Sanchez A D et al. High-power phase locking of a fiber amplifier array[J]. Proceedings of SPIE, 7195, 71951M(2009). http://spie.org/Publications/Proceedings/Paper/10.1117/12.809416

[31] McNaughty S J, Thielen P A, Adams L N et al. . Scalable coherent combining of kilowatt fiber amplifiers into a 2.4 kW beam[J]. IEEE Journal of Selected Topics in Quantum Electronics, 20, 174-181(2014). http://ieeexplore.ieee.org/document/6732914/

[32] Jiang M, Su R T, Zhang Z X et al. Coherent beam combining of fiber lasers using a CDMA-based single-frequency dithering technique[J]. Applied Optics, 56, 4255-4260(2017).

[33] Hou J, Xiao R, Liu Z J et al. Two methods to realize phase controlling of ytterbium fiber amplifiers[J]. High Power Laser and Particle Beams, 18, 1779-1782(2006).

[34] Wu J L, Liu J J, Xing Z B et al. Phase controlling methods and experiment of fiber laser coherent combination[J]. Laser & Infrared, 39, 584-587(2009).

[35] Fan X Y, Liu J J, Liu JS et al. Theoretical and experimental study of multi-element coherent fiber array[J]. Acta Physica Sinica, 59, 2462-2470(2010).

[36] Zhou P, Ma Y X, Wang X L et al. Coherent beam combining of fiber amplifiers based on stimulated annealing algorithm[J]. High Power Laser and Particle Beams, 22, 973-977(2010).

[37] Zhou P, Ma Y X, Wang X L et al. Coherent beam combination of three two-tone fiber amplifiers using stochastic parallel gradient descent algorithm[J]. Optics Letters, 34, 2939-2941(2009). http://www.opticsinfobase.org/abstract.cfm?uri=ol-34-19-2939

[38] Zhou P, Liu Z J, Wang X L et al. Coherent beam combination of two-dimensional high power fiber amplifier array using stochastic parallel gradient descent algorithm[J]. Applied Physics Letters, 231106(2009). http://scitation.aip.org/content/aip/journal/apl/94/23/10.1063/1.3152282

[39] Bourderionnet J, Bellanger C, Primot J et al. Collective coherent phase combining of 64 fibers[J]. Optics Express, 19, 17053-17058(2011). http://www.ncbi.nlm.nih.gov/pubmed/21935065/

[40] Ahn H K, Kong H J. Cascaded multi-dithering theory for coherent beam combining of multiplexed beam elements[J]. Optics Express, 23, 12407-12413(2015). http://www.opticsinfobase.org/abstract.cfm?uri=oe-23-9-12407

[41] Su R T, Zhang Z X, Zhou P et al. Coherent beam combining of a fiber lasers array based on cascaded phase control[J]. IEEE Photonics Technology Letters, 28, 2585-2588(2016). http://ieeexplore.ieee.org/document/7559720/