Refractive index and geometrical structure measurement of a core-doped photonic crystal fiber

Y. Youk; S. Kim; K. Oh; J. Kobelke; K. Schuster; J. Kirchhof; D. Y. Kim

doi:10.1117/12.645723

1 March 2006 Refractive index and geometrical structure measurement of a core-doped photonic crystal fiber

Y. Youk, S. Kim, K. Oh, J. Kobelke, K. Schuster, J. Kirchhof, D. Y. Kim

Proceedings Volume 6128, Photonic Crystal Materials and Devices IV; 61281P (2006) https://doi.org/10.1117/12.645723
Event: Integrated Optoelectronic Devices 2006, 2006, San Jose, California, United States

Abstract

Using confocal scanning optical microscopy, we carried out a direct refractive index profiling technique of complex and non-symmetric structured optical fibers. Several improvements on the earlier design are proposed; a light emitting diode (LED) at 658 nm wavelength instead of a laser diode (LD) or He-Ne laser is used as a light source for better index precision, and a simple longitudinal linear scanning and a curve fitting techniques are adapted instead of a servo control for maintaining an optical confocal arrangement. Also, we have developed a novel technique to remove measurement noise generated by pinhole diffraction. This improved, straightforward, and robust method can be used to determine the refractive index profile of optical fibers by determining the reflectivity of a sample's surface. This technique is easy and repeatable, and we demonstrated the refractive index measurement of a core-doped photonic crystal fiber for the first time.

Citation Download Citation

Y. Youk, S. Kim, K. Oh, J. Kobelke, K. Schuster, J. Kirchhof, and D. Y. Kim "Refractive index and geometrical structure measurement of a core-doped photonic crystal fiber", Proc. SPIE 6128, Photonic Crystal Materials and Devices IV, 61281P (1 March 2006); https://doi.org/10.1117/12.645723

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