[14] [14] Rui D ,Liu C ,Chen M , et al. Probability enhancement of fi- ber coupling efficiency under turbulence with adaptive op- tics compensation[J] . Optical Fiber Technology ,2020 ,60(3) :110- 115.

[15] [15] Lu G ,Ma J , Zhai C , et al. Pointing errors effect on fiber coupling efficiency for Gaussian-beam wave through atmos- pheric turbulence channel in FSO links[J] . Optics Com- munications ,2018 ,43(2) :7- 17.

[16] [16] Beibei H , Lin Y , Yixin Z. Fiber coupling efficiency of Gaussian-Schell model beams in an ocean to fiber link witha Zernike tilt correction.[J] . Applied optics , 2018 , 57(20) :220-229.

[17] [17] Junhong Y ,Linhui G ,Hualing W , et al. Analysis influence of fiber alignment error on laser - diode fiber coupling effi- ciency[J] . Optik - International Journal for Light and E- lectron Optics ,2016 ,127(6) :12-22.