Free space single-mode fibers and fiber components for fiber sensor applications

Abstract

This invention relates to a near real time optical compensation verification system for verifying a fiber or fiber component through internal or external compensation to achieve equivalently free space propagation of a broadband light when coupled into fiber. Preferably, no component is added to the fiber or fiber component, and the compensation method is realized through real time fiber bending, twisting or other means at either or both ends of a fiber or fiber component. The output optical characteristics of the compensated fiber or fiber component are measured by a polarimeter through changing the input light properties. The required multi-variable compensation to achieve Unitary Matrix free space condition is computed in near real time, and as the feedback to formulate the required compensation. The disclosed invention not only enhances yield in the fiber and fiber component, but also accelerates the optimization of optical fiber sensors employed free space fiber coil.

What is claimed is: 
     
         1 . An optical verification system for verifying an optical compensation of an equivalent free space via an optical system, comprising:
 a broadband light source for emitting a light,   an optical circuit having an optical fiber or fiber coil is used to input the light and output the light, wherein the optical circuit has optical characteristics of an equivalent free space via internal or external optical compensation;   a sample optical component having a given optical parameter, coupled to the optical circuit; and   a polarimeter for measuring an optical parameter of the output light, wherein the optical parameter is compared with the given optical parameter to verify the compensation of an equivalent free space for the optical circuit.   
     
     
         2 . The system as claimed in  claim 1 , wherein the sample optical component is an optical component for changing an optical polarization state.