Mode Properties and Propagation Effects of Optical Orbital Angular Momentum (OAM) Modes in a Ring Fiber

Yang Yue; Yan Yan; Nisar Ahmed; Jeng-Yuan Yang; Lin Zhang; Yongxiong Ren; Hao Huang; Kevin M. Birnbaum; Baris I. Erkmen; Sam Dolinar; Moshe Tur; Alan E. Willner

doi:10.1109/JPHOT.2012.2192474

IEEE Photonics Journal (Jan 2012)

Mode Properties and Propagation Effects of Optical Orbital Angular Momentum (OAM) Modes in a Ring Fiber

Yang Yue,
Yan Yan,
Nisar Ahmed,
Jeng-Yuan Yang,
Lin Zhang,
Yongxiong Ren,
Hao Huang,
Kevin M. Birnbaum,
Baris I. Erkmen,
Sam Dolinar,
Moshe Tur,
Alan E. Willner

Affiliations

Yang Yue: <formula formulatype="inline"><tex Notation="TeX">$^{1}$</tex></formula>Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA
Yan Yan: Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA
Nisar Ahmed: Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA
Jeng-Yuan Yang: Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA
Lin Zhang: Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA
Yongxiong Ren: Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA
Hao Huang: Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA
Kevin M. Birnbaum: <formula formulatype="inline"><tex Notation="TeX">$^{2}$</tex></formula>Jet Propulsion Laboratory, Pasadena, CA, USA
Baris I. Erkmen: Jet Propulsion Laboratory, Pasadena, CA, USA
Sam Dolinar: Jet Propulsion Laboratory, Pasadena, CA, USA
Moshe Tur: <formula formulatype="inline"><tex Notation="TeX">$^{3}$</tex></formula>School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
Alan E. Willner: Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA

DOI: https://doi.org/10.1109/JPHOT.2012.2192474
Journal volume & issue: Vol. 4, no. 2
pp. 535 – 543

Abstract

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We simulate and analyze the mode properties and propagation effects of orbital angular momentum (OAM) modes in a ring fiber. A ring fiber with 0.05 up-doping is designed in simulation to support up to 10 OAM modes while maintaining single-mode condition radially. With a multiple-ring fiber, tens of OAM modes can be potentially multiplexed to greatly enhance the system capacity and spectral efficiency. The mode index difference can be maintained above 10-4 over hundreds of nanometers optical bandwidth. Higher order OAM modes' azimuthal intensity and odd-order OAM modes' azimuthal phase show better tolerance to the fiber ellipticity. Moreover, higher order OAM modes also have longer 2π and 10-ps walk-off length. After 600-km propagation, OAM0,4 mode shows <; 10-ps mode walk- off, even in a ring fiber with 1% ellipticity. Also, in such an elliptical fiber, the well-aligned OAM modes with different charges have <;-20 dB intermode crosstalk. The improvement of the circularity for the ring fiber is expected to reduce the crosstalk and increase the demultiplexing efficiency.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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