25 January 2016 Cladding modes in photonic crystal fiber: characteristics and sensitivity to surrounding refractive index
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Abstract
Characteristics of cladding modes in a photonic crystal fiber (PCF) with triangular air-hole lattice in the cladding are numerically analyzed using a finite element method. The transition for LP11 cladding mode to core mode with variation of the normalized wavelength has been shown. The transition of the LP01 cladding mode to the outer silica mode and reorganization of the LP0m cladding modes caused by varying the fiber radius has been investigated. By choosing the optimized fiber radius, which is located in the cladding modes’ reorganization region, the sensitivity of the coupled wavelength between the core mode LP01 and cladding mode LP03 to surrounding refractive index is increased by a factor of five and reaches to 2660  nm/refractive index unit over the range of 1.40 to 1.42. The sensitivity is competitive with that of long-period grating in PCF in response to changes in refractive indices of the medium contained in the cladding air channels.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Xiuli Jiang, Zhengtian Gu, Li Zheng, "Cladding modes in photonic crystal fiber: characteristics and sensitivity to surrounding refractive index," Optical Engineering 55(1), 017106 (25 January 2016). https://doi.org/10.1117/1.OE.55.1.017106 . Submission:
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