High-sensitivity high-resolution refractometry with twin turn-around-point long-period gratings in a photonic crystal fiber

Jiri Kanka

doi:10.1117/12.2017335

3 May 2013 High-sensitivity high-resolution refractometry with twin turn-around-point long-period gratings in a photonic crystal fiber

Jiri Kanka

Author Affiliations +

Proceedings Volume 8775, Micro-structured and Specialty Optical Fibres II; 87750Q (2013) https://doi.org/10.1117/12.2017335
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

Abstract

We present the numerical design of a turn-around-point long-period grating in a photonic crystal fiber (TAP PCFLPG) for high-sensitivity, high-resolution refractometry of gases. High refractive-index sensitivity is achieved by operating LPGs in the vicinity of the dispersion turning point of the optimized PCF. Despite the resonant wavelength of the optimized PCF-LPG is highly sensitive to the refractive index of analytes, its large shifts could be monitored with a reduced resolution because the resonance dip in the TAP LPG transmission spectrum is broad. To provide also high refractive-index resolution, twin TAP-LPGs have been proposed to be used as 3 dB broadband mode converters in the interferometric scheme. The first LPG couples a portion of the light in the core mode to a forward propagating cladding mode and the second LPG couples the light back to the core mode. The resulting interference fringes within the envelope of LPG attenuation dip provide a means for higher resolution sensing. Instead of monitoring the wavelength shift as a result of a refractive index change, the transmission spectrum can also be analyzed in terms of the shift in phase suffered by the fringe pattern. This is a more accurate way of interpreting the interferometric sensor measurements, since the phase shift is a direct result of an analyte-induced change in optical path length.

Citation Download Citation

Jiri Kanka "High-sensitivity high-resolution refractometry with twin turn-around-point long-period gratings in a photonic crystal fiber", Proc. SPIE 8775, Micro-structured and Specialty Optical Fibres II, 87750Q (3 May 2013); https://doi.org/10.1117/12.2017335

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KEYWORDS

Cladding

Refractive index

Phase shifts

Interferometry

Photonic crystal fibers

Phase matching

Refractometry

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