Transmission characteristics of polarization-dependent refractometer based on a surface long-period grating (SLPG) inscribed in a D-shaped photonic crystal fiber (PCF) are investigated. The birefringence of SLPG produces the separation of transmission spectra for TE and TM polarization modes. We also measure the sensitivities of PCF-based SLPG to temperature and external refractive index change depending on the input polarization states. The SLPG-based sensor exhibits different temperature and ambient index sensitivities corresponding to TE and TM polarization modes. Therefore, the SLPG inscribed in D-shaped PCFs can effectively discriminate temperature and ambient index sensitivities.
© 2012 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: January 10, 2012
Revised Manuscript: March 12, 2012
Manuscript Accepted: April 3, 2012
Published: May 17, 2012
H.-J. Kim, O.-J. Kwon, S. B. Lee, and Y.-G. Han, "Polarization-dependent refractometer for discrimination of temperature and ambient refractive index," Opt. Lett. 37, 1802-1804 (2012)