New possibilities of higher-order mode filtering in large-mode-area photonic crystal fibers

Vladimir Demidov; Egishe Ter-Nersesyants

doi:10.1117/12.2051731

2 May 2014 New possibilities of higher-order mode filtering in large-mode-area photonic crystal fibers

Vladimir Demidov, Egishe Ter-Nersesyants

Proceedings Volume 9128, Micro-structured and Specialty Optical Fibres III; 91280S (2014) https://doi.org/10.1117/12.2051731
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

We discuss both theoretical and experimental aspects of modal discrimination phenomenon that takes place in largemode- area photonic crystal fibers. A few special fiber designs providing efficient higher-order mode filtering were implemented and investigated. First adaptation had the core comprised of 7 elements (instead of 1) with a view to reduce the pitch, since smaller pitches correspond to lower bend-induced losses. That measure aided to realize a series of fibers with a 35-75 μm core diameter propagating only the fundamental mode within a wide spectral range due to embedded leakage channels for the higher-order mode which losses were rated to be above 1 dB/m. Second variation included the fiber with circularly distributed air holes surrounding a core of 30-50 μm in diameter. Circular geometrical configuration enabled leakage losses of the higher-order mode to be 120 times larger than leakage losses of the fundamental mode. Third adaptation had the alternation of large and small air holes (C_6V symmetry converted to C_3V symmetry) resulting in partial or complete delocalization of the higher-order mode power outward a core region. Fourth design represented the regular triangular-lattice structure with a core of 35-60 μm in diameter shifted from its usual location in the center of the lattice. The main idea consisted in provoking an enhancement of the higher-order mode discrimination, as higher-order mode has a larger field near to the air-hole silica interfaces compared to fundamental mode. Those fibers demonstrated distinguished bending resistance properties, since could be exploited with a bending radius of 2-3 centimeters.

Citation Download Citation

Vladimir Demidov and Egishe Ter-Nersesyants "New possibilities of higher-order mode filtering in large-mode-area photonic crystal fibers", Proc. SPIE 9128, Micro-structured and Specialty Optical Fibres III, 91280S (2 May 2014); https://doi.org/10.1117/12.2051731

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KEYWORDS

Signal attenuation

Cladding

Optical filters

Resistance

Photonic crystal fibers

Silica

Refractive index

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