Few-Mode Fiber Coupling Efficiency for Free-Space Optical Communication

Few-mode fiber is a significant component of free-space optical communication at the receiver to obtain achievable high coupling efficiency. A theoretical coupling model from the free-space optical communication link to a few-mode fiber is proposed based on a scale-adapted set of Laguerre-Gaussian modes. It is found that the coupling efficiency of various modes behaves differently in the presence of atmospheric turbulence or random jitter. Based on this model, the optimal coupling geometry parameter is obtained to maximize the coupling efficiency of the selected mode of few-mode fiber. The communication performance with random jitter is investigated. It is shown that the few-mode fiber has better bit-error rate performance than single-mode fiber, especially in high signal-to-noise ratio regimes.

[1]  Morio Toyoshima,et al.  Maximum fiber coupling efficiency and optimum beam size in the presence of random angular jitter for free-space laser systems and their applications. , 2006, Journal of the Optical Society of America. A, Optics, image science, and vision.

[2]  L. Andrews,et al.  Laser Beam Propagation Through Random Media , 1998 .

[3]  He Wen,et al.  Optimizing free space to few-modefiber coupling efficiency. , 2019, Applied optics.

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

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

[6]  Z. Cao,et al.  Reconfigurable beam system for non-line-of-sight free-space optical communication , 2019, Light: Science & Applications.

[7]  Michael Duparré,et al.  Overlap relation between free-space Laguerre Gaussian modes and step-index fiber modes. , 2015, Journal of the Optical Society of America. A, Optics, image science, and vision.

[8]  Allan W. Snyder,et al.  Excitation and Scattering of Modes on a Dielectric or Optical Fiber , 1969 .

[9]  Italo Toselli,et al.  Gaussian beam propagation in maritime atmospheric turbulence: long term beam spread and beam wander analysis , 2010, Optical Engineering + Applications.

[10]  M Imai,et al.  Excitation of the fundamental and low-order modes of optical fiber waveguides with gaussian beams. 2: offset beams. , 1975, Applied optics.

[11]  D. Gloge.  Weakly guiding fibers. , 1971, Applied optics.

[12]  David J. Geisler,et al.  Experimental comparison of 3-mode and single-mode coupling over a 1.6-km free-space link , 2018, LASE.

[13]  Alexander Argyros,et al.  Photonic lanterns , 2015, 1503.03269.

[14]  E. Snitzer.  Cylindrical Dielectric Waveguide Modes , 1961 .

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

[16]  Alan E. Willner,et al.  Performance of real-time adaptive optics compensation in a turbulent channel with high-dimensional spatial-mode encoding. , 2020, Optics express.

[17]  Wei Li,et al.  Free-space to few-mode-fiber coupling under atmospheric turbulence. , 2016, Optics express.

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

[19]  David J. Geisler,et al.  Analysis of free-space coupling to photonic lanterns in the presence of tilt errors , 2017, 2017 IEEE Photonics Conference (IPC).

[20]  Shlomi Arnon,et al.  Effects of atmospheric turbulence and building sway on optical wireless-communication systems. , 2003, Optics letters.

[21]  David J. Geisler,et al.  Ground Receiver Architectures Enabled by Digital Coherent Combining , 2018 .

[22]  Mikhail A. Vorontsov,et al.  Characterization of optical turbulence (Cn2) data measured at the ARL A_LOT facility , 2005 .

[23]  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.

[24]  R. Thomson,et al.  The photonic lantern , 2014, 2014 Conference on Lasers and Electro-Optics (CLEO) - Laser Science to Photonic Applications.

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

[26]  Wei Li,et al.  Performance enhancement of free-space optical communications under atmospheric turbulence using modes diversity coherent receipt. , 2018, Optics express.