Fiber Optics Section

  The Fiber Optics Section is one of the most fundamental and oldest units of the Physical Department in TNU founded as early as 1972. The basic investigations performed in FOS are the theory and the experimental substantiation of the vortical composition of fiber eigen modes in 1995. The stuff of the Section for the first time in 1997 showed the spin-orbital nature of the fiber fields and revealed the role of the spin orbit interaction as the generic vortex propagates along a perturbed optical fiber. The destruction of the generic vortices can be prevented at the expense of operating with a vortex-preserving fiber. The vortex-preserving fibers were shown could be three kinds discriminated by the ways of their manufacturing: an elliptic-core-twisted fiber with a weak material birefringence, anisotropic-core- twisted fiber with a weak geometrical birefringence and a spiral-coiled-core fiber. All these fibers also differ in excitation ways.
  The super-sensitive interferometric fiber-optical sensors on the base of guided optical vortices was worked out in the Fiber Optics Section in 2000. The temperature sensitivity of such sensor are higher than 200 . There showed the ways of performing one-way interferometric devises and worked out the image-processing ways of their experimental data.