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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 21 — Oct. 13, 2008
  • pp: 16632–16645

Detailed investigation of self-imaging in largecore multimode optical fibers for application in fiber lasers and amplifiers

X. Zhu, A. Schülzgen, H. Li, L. Li, L. Han, J. V. Moloney, and N. Peyghambarian  »View Author Affiliations


Optics Express, Vol. 16, Issue 21, pp. 16632-16645 (2008)
http://dx.doi.org/10.1364/OE.16.016632


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Abstract

Properties of the self-imaging effect based on multimode interference (MMI) in large-core passive optical fibers are investigated and analyzed in detail, with the purpose of using multimode active fibers for high power single-transverse-mode emission. Although perfect self-imaging of the input field from a standard single-mode fiber (SMF-28) in a multimode fiber becomes practically impossible as its core diameter is larger than 50 µm, a quasi-reproduction of the input field occurs when the phase difference between the excited modes and the peak mode inside the multimode fiber is very small. Our simulation and experimental results indicate that, if the length of the multimode fiber segment can be controlled accurately, reproduction of the input field with a self-imaging quality factor larger than 0.9 can be obtained. In this case, a low-loss hybrid fiber cavity composed of a SMF-28 segment and a very-large-core active multimode fiber segment can be built. It is also found that for the hybrid fiber cavity, increasing the mode-field diameter of the single-mode fiber improves both the self-imaging quality and the tolerance on the required length accuracy of the multimode fiber segment. Moreover, in this paper key parameters for the design of MMI-based fiber devices are defined and their corresponding values are provided for multimode fibers with core diameters of 50 µm and 105 µm.

© 2008 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4780) Lasers and laser optics : Optical resonators

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: August 18, 2008
Revised Manuscript: September 18, 2008
Manuscript Accepted: September 28, 2008
Published: October 2, 2008

Citation
X. Zhu, A. Schülzgen, H. Li, L. Li, L. Han, J. V. Moloney, and N. Peyghambarian, "Detailed investigation of self-imaging in large-core multimode optical fibers for application in fiber lasers and amplifiers," Opt. Express 16, 16632-16645 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-21-16632


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