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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 25461–25470

Mode evolution in long tapered fibers with high tapering ratio

Juho Kerttula, Valery Filippov, Vasily Ustimchik, Yuri Chamorovskiy, and Oleg G. Okhotnikov  »View Author Affiliations

Optics Express, Vol. 20, Issue 23, pp. 25461-25470 (2012)

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We have experimentally studied fundamental mode propagation in few meters long, adiabatically tapered step-index fibers with high numerical aperture, core diameter up to 117 μm (V = 38) and tapering ratio up to 18. The single fundamental mode propagation was confirmed by several techniques that reveal no signature of higher-order mode excitation. It can be, therefore, concluded that adiabatic tapering is a powerful method for selective excitation of the fundamental mode in highly multimode large-mode-area fibers. Annular near field distortion observed for large output core diameters was attributed to built-in stress due to thermal expansion mismatch between core and cladding materials. The mechanical stress could be avoided by an appropriate technique of fiber preform fabrication and drawing, which would prevent the mode field deformation and lead to reliable diffraction-limited fundamental mode guiding for very large core diameters.

© 2012 OSA

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2400) Fiber optics and optical communications : Fiber properties

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: August 2, 2012
Revised Manuscript: October 9, 2012
Manuscript Accepted: October 18, 2012
Published: October 25, 2012

Juho Kerttula, Valery Filippov, Vasily Ustimchik, Yuri Chamorovskiy, and Oleg G. Okhotnikov, "Mode evolution in long tapered fibers with high tapering ratio," Opt. Express 20, 25461-25470 (2012)

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