Orthogonal polarization mode coupling for pure twisted polarization maintaining fiber Bragg gratings

High-Order Interference Effect Introduced by Polarization Mode Coupling in Polarization - Maintaining Fiber and Its Identification

The high-order interference (HOI)-The interferogram introduced by polarization mode couplings (PMC) of multiple perturbations-Will cause misjudgment of the realistic coupling points in polarization-maintaining fiber (PMF) which is tested with a white light interferometer (WLI) with large dynamic range. We present an optical path tracking (OPT) method for simplifying the analysis of HOI, and dem...

Experimental Investigation on Acousto-ultrasonic Sensing Using Polarization-maintaining Fiber Bragg Gratings

This report discusses the guided Lamb wave sensing using polarization-maintaining (PM) fiber Bragg grating (PM-FBG) sensor. The goal is to apply the PM-FBG sensor system to composite structural health monitoring (SHM) applications in order to realize directivity and multi-axis strain sensing capabilities while reducing the number of sensors. Comprehensive experiments were conducted to evaluate ...

Light Polarization-Assisted Sensing with Tilted Fiber Bragg Gratings

Tilted fiber Bragg gratings (TFBGs) are short-period gratings for which the refractive index modulation of the fiber core is angled by a few degrees with respect to the perpendicular to the propagation axis. They induce two kinds of light coupling: the self-backward coupling of the core mode at the Bragg wavelength and the backward coupling between the core mode and several tens of cladding mod...

Self - starting all - polarization maintaining Yb - fiber laser with a polarization maintaining anomalous dispersion higher - order - mode fiber

Mode-coupling analysis of anisotropic polarization-maintaining fibers.

We analyze the coupling between the fundamental vector modal fields of two parallel polarization-maintaining fibers. An improved coupled-mode theory is employed, which also applies to anisotropic materials. Results for the array-mode-propagation constants are presented as a function of the relative tilt angle between the principal axes of the two fibers.