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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 8 — Apr. 22, 2013
  • pp: 9215–9229

Cross-correlated imaging of single-mode photonic crystal rod fiber with distributed mode filtering

Marko Laurila, Roman Barankov, Mette M. Jørgensen, Thomas T. Alkeskjold, Jes Broeng, Jesper Lægsgaard, and Siddharth Ramachandran  »View Author Affiliations

Optics Express, Vol. 21, Issue 8, pp. 9215-9229 (2013)

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Photonic crystal bandgap fibers employing distributed mode filtering design provide near diffraction-limited light outputs, a critical property of fiber-based high-power lasers. Microstructure of the fibers is tailored to achieve single-mode operation at specific wavelength by resonant mode coupling of higher-order modes. We analyze the modal regimes of the fibers having a mode field diameter of 60 µm by the cross-correlated (C2) imaging method in different wavelength ranges and evaluate the sensitivity of the modal content to various input-coupling conditions. As a result, we experimentally identify regimes of resonant coupling between higher-order core modes and cladding band. We demonstrate a passive fiber design in which the higher-order modal content inside the single-mode guiding regime is suppressed by at least 20 dB even for significantly misaligned input-coupling configurations.

© 2013 OSA

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.4005) Fiber optics and optical communications : Microstructured fibers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: January 15, 2013
Revised Manuscript: March 15, 2013
Manuscript Accepted: March 27, 2013
Published: April 8, 2013

Marko Laurila, Roman Barankov, Mette M. Jørgensen, Thomas T. Alkeskjold, Jes Broeng, Jesper Lægsgaard, and Siddharth Ramachandran, "Cross-correlated imaging of single-mode photonic crystal rod fiber with distributed mode filtering," Opt. Express 21, 9215-9229 (2013)

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