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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 32 — Nov. 10, 2010
  • pp: 6340–6347

Comparative study of mid-infrared fibers for modal filtering

Romain Grille, Olga Caballero-Calero, Brahim Arezki, Tomer Lewi, Pierre Kern, Abraham Katzir, and Guillermo Martin  »View Author Affiliations

Applied Optics, Vol. 49, Issue 32, pp. 6340-6347 (2010)

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We compare the filtering capabilities of two infrared fibers developed to achieve a high rejection ratio of the higher order modes in order to obtain compact modal filters devoted to stellar interferometry. Two types of double-clad fibers are studied: a fiber with a second thin absorbing cladding and a fiber with a second thick absorbing cladding closer to the fiber core; both are single mode around the CO 2 band ( 10.6 μm ). We present the single-mode spectral domain and the nulling capabilities of both fibers for different fiber lengths, comparing simulations with experimental results. We show that the filtering capabilities are improved when the absorbing clad is closer to the fiber core, as the propagation distance needed to filter out these modes is shorter. Thus, to obtain high rejection ratios in compact devices, an absorbing cladding close to the core of the fiber is compulsory in order to suppress cladding modes that could eventually recouple into the waveguide. We present an empirical model that allows determining the minimum filter length, considering only one effective leaky mode with low attenuation, which considerably simplifies the theoretical studies.

© 2010 Optical Society of America

OCIS Codes
(060.2390) Fiber optics and optical communications : Fiber optics, infrared
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(130.3060) Integrated optics : Infrared

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: July 7, 2010
Revised Manuscript: October 7, 2010
Manuscript Accepted: October 8, 2010
Published: November 9, 2010

Romain Grille, Olga Caballero-Calero, Brahim Arezki, Tomer Lewi, Pierre Kern, Abraham Katzir, and Guillermo Martin, "Comparative study of mid-infrared fibers for modal filtering," Appl. Opt. 49, 6340-6347 (2010)

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