Free-space to few-mode-fiber coupling under atmospheric turbulence.

High speed free space optical communication (FSOC) has taken advantages of components developed for fiber-optic communication systems. Recently, with the rapid development of few-mode-fiber based fiber communication systems, few-mode-fiber components might further promote their applications in FSOC system. The coupling efficiency between free space optical beam and few-mode fibers under atmospheric turbulence effect are investigated in this paper. Both simulation and experimental results show that, compared with single-mode fiber, the coupling efficiencies for a 2-mode fiber and a 4-mode fiber are improved by ~4 dB and ~7 dB respectively in the presence of medium moderate and strong turbulence. Compared with single-mode fiber, the relative standard deviation of received power is restrained by 51% and 66% respectively with a 4-mode and 2-mode fiber.

[1]  Liying Tan,et al.  Degradation of single-mode fiber coupling efficiency due to localized wavefront aberrations in free-space laser communications , 2010 .

[2]  Bryan S. Robinson,et al.  Overview and results of the Lunar Laser Communication Demonstration , 2014, Photonics West - Lasers and Applications in Science and Engineering.

[3]  J. Cho,et al.  4 x 10 Gb/s terrestrial optical free space transmission over 1.2 km using an EDFA preamplifier with 100 GHz channel spacing. , 2000, Optics express.

[4]  L. Nelson,et al.  Space-division multiplexing in optical fibres , 2013, Nature Photonics.

[5]  Erich Leitgeb,et al.  Optical networks, last mile access and applications , 2005 .

[6]  Yoshihisa Takayama,et al.  Experimental verification of fiber-coupling efficiency for satellite-to-ground atmospheric laser downlinks. , 2012, Optics express.

[7]  Ruochi Zhang,et al.  Fiber-based free-space optical coherent receiver with vibration compensation mechanism. , 2013, Optics express.

[8]  David L. Fried,et al.  Statistics of a Geometric Representation of Wavefront Distortion: Errata , 1965 .

[9]  W. Leeb,et al.  Fiber coupling efficiency for random light and its applications to lidar. , 1998, Optics letters.

[10]  Xinyang Li,et al.  Modal correction for fiber-coupling efficiency in free-space optical communication systems through atmospheric turbulence , 2010 .

[11]  Ibrahim Ozdur,et al.  Free-space to single-mode collection efficiency enhancement using photonic lanterns. , 2013, Optics letters.

[12]  Benyuan Zhu,et al.  Long distance transmission in few-mode fibers. , 2010, Optics express.

[13]  G. E. Tourgee,et al.  2.5 Gbit/s free space optical link over 4.4 km , 1999 .

[14]  D. Gloge,et al.  Optical power flow in multimode fibers , 1972 .

[15]  L. Rusch,et al.  Suppression of Turbulence-Induced Scintillation in Free-Space Optical Communication Systems Using Saturated Optical Amplifiers , 2006, Journal of Lightwave Technology.

[16]  Guifang Li,et al.  Space-division multiplexing: the next frontier in optical communication , 2014 .

[17]  Yamac Dikmelik,et al.  Fiber-coupling efficiency for free-space optical communication through atmospheric turbulence. , 2005 .

[18]  Hong Guo,et al.  Heterodyne efficiency of a coherent free-space optical communication model through atmospheric turbulence. , 2012, Applied optics.