20 April 2010 Mode coupling in photonic crystal fiber using long-period gratings for enhanced overlap of evanescent field
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Abstract
An evanescent field sensing platform is being pursued through excitation of cladding modes using long-period (LPGs) inscribed in an endlessly single-mode photonic crystal fiber (ESM PCF) by CO2 laser irradiation. Core-cladding mode coupling and recoupling has resulted in significant improvement in the evanescent field overlap throughout the cladding air channels in the PCF-LPG, compared to the PCF alone. Our numerical simulation has shown that design optimization of the PCF-LPG configuration can lead to a field power overlap as high as 23% with a confinement loss of less than 1 dB/m in the cladding mode.
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Zonghu He, Zonghu He, Yinian Zhu, Yinian Zhu, Jiří Kaňka, Jiří Kaňka, Dennis J. Trevor, Dennis J. Trevor, Henry Du, Henry Du, } "Mode coupling in photonic crystal fiber using long-period gratings for enhanced overlap of evanescent field", Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 767711 (20 April 2010); doi: 10.1117/12.851732; https://doi.org/10.1117/12.851732
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