Performance of Sagnac Interferometer with Loops Made of PCF and PANDA Fibers

Abstract

The parametric effects on performance of the Sagnac interferometer with loop (SLI) made of high-birefringence photonic crystal fiber (HB-PCF) and polarization-maintaining and absorption reducing (PANADA) fibers are simulated and analyzed accordingly in this paper where transmission spectra and the variations of free spectral range are studied under different conditions. The obtained results from calculations and comparisons of the curves loop fiber made of standard polarization-maintaining fiber and high-birefringence photonic crystal fibers revealed that the distance between fringes (DBF) of the SLI would reduce by increasing loop length. This reducing trend in case of HB-PCF has steeper slope. The DBF for two fibers HB-PCF and PANDA with shorter loop lengths would increase.This study reveals that by using high-birefringence PCF, one can optimize the loop length with minimum distance between fringes in the Sagnac loop interferometer. The obtained results provide a required condition for fabrication of SLI-based devices, such as optical sensors, with a small packaging size.