Encoding information as orbital angular momentum states of light for wireless optical communications

2007 ◽  
Vol 46 (1) ◽  
pp. 019701 ◽  
Author(s):  
Hui Li
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communications ◽  
Wireless Optical Communications

scholarly journals Fast Auto-Align ment Underwater Wireless Optical Communications Employing Orbital Angular Momentum Modes

2020 ◽  
Author(s):  
Chengkun Cai ◽  
Yifan Zhao ◽  
Jieying Zhang ◽  
Lulu Wang ◽  
Jian Wang
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communications ◽  
Underwater Acoustic Communication ◽  
Communication Link ◽  
Wireless Optical Communication ◽  
Alignment System ◽  
Capacity Scaling ◽  
Wireless Optical Communications ◽  
New Perspective

Abstract Underwater wireless communication plays an increasingly important role in more and more emerging ocean and sea activities. Traditional underwater acoustic communication is limited by low transmission capacity (tens of Kbit/s). Underwater wireless optical communication (UWOC) provides high bandwidth (GHz). Yet the challenge is not only its continuous capacity scaling, but its resistance to environment disturbance, which is an intrinsic weakness of wireless optical communications with high directivity. Here, we propose and demonstrate fast auto-alignment underwater wireless optical communications employing orbital angular momentum (OAM) modes. The OAM multiplexing, an alternative approach of space-division multiplexing, enables capacity scaling. The fast auto-alignment system, having two stages for thorough alignment, facilitates stable and reliable communication link against vibration. Two OAM modes multiplexing transmission link with 4-Gbit/s aggregate capacity is demonstrated in the experiment under four different vibration conditions assisted by the fast auto-alignment system with a response time of 244 Hz. The demonstrations may open up new perspective to robust stable underwater wireless optical communications exploiting spatial modes in practical environment.

scholarly journals Propagation-Invariant Off-Axis Elliptic Gaussian Beams with the Orbital Angular Momentum

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 190
Author(s):  
Alexey A. Kovalev ◽  
Victor V. Kotlyar ◽  
Darya S. Kalinkina
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communications ◽  
Optical Axis ◽  
Transverse Plane ◽  
Gaussian Beams ◽  
Analytical Expression ◽  
Beam Center ◽  
Wireless Optical Communications ◽  
Light Beams

We studied paraxial light beams, obtained by a continuous superposition of off-axis Gaussian beams with their phases chosen so that the whole superposition is invariant to free-space propagation, i.e., does not change its transverse intensity shape. Solving a system of five nonlinear equations for such superpositions, we obtained an analytical expression for a propagation-invariant off-axis elliptic Gaussian beam. For such an elliptic beam, an analytical expression was derived for the orbital angular momentum, which was shown to consist of two terms. The first one is intrinsic and describes the momentum with respect to the beam center and is shown to grow with the beam ellipticity. The second term depends parabolically on the distance between the beam center and the optical axis (similar to the Steiner theorem in mechanics). It is shown that the ellipse orientation in the transverse plane does not affect the normalized orbital angular momentum. Such elliptic beams can be used in wireless optical communications, since their superpositions do not interfere in space, if they do not interfere in the initial plane.

Optical communications using orbital angular momentum beams

2015 ◽  
Vol 7 (1) ◽  
pp. 66 ◽  
Author(s):  
A. E. Willner ◽  
H. Huang ◽  
Y. Yan ◽  
Y. Ren ◽  
N. Ahmed ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communications

The efficient sorting of light's orbital angular momentum for optical communications

2012 ◽  
Author(s):  
Martin P. J. Lavery ◽  
David Roberston ◽  
Mehul Malik ◽  
Brandon Robenburg ◽  
Johannes Courtial ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communications

scholarly journals Orbital Angular Momentum-based Space Division Multiplexing for High-capacity Underwater Optical Communications

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Yongxiong Ren ◽  
Long Li ◽  
Zhe Wang ◽  
Seyedeh Mahsa Kamali ◽  
Ehsan Arbabi ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communications ◽  
High Capacity ◽  
Space Division Multiplexing ◽  
Space Division

Free-space optical communications using encoding of data on different orbital-angular-momentum modes

2016 ◽  
Author(s):  
Asher J. Willner ◽  
Yongxiong Ren ◽  
Guodong Xie ◽  
Long Li ◽  
Yinwen Cao ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communications ◽  
Free Space ◽  
Free Space Optical
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