Optical fiber device for removing cladding light, apparatus and method for etching the same

Abstract

The present invention relates to an optical fiber device for removing cladding light, an apparatus and a method for etching the same. The optical fiber device comprises: a first optical fiber section through an Nth optical fiber section arranged in sequence along a light travelling direction; and a first tapered coupling section coupling a Kth optical fiber section and a (K+1)th optical fiber section, where the Kth optical fiber section is any one of the first optical fiber section through the Nth optical fiber section and the (K+1)th optical fiber section is any one of the first optical fiber section through the Nth optical fiber section adjacent to the Kth optical fiber section, wherein the Kth optical fiber section comprises: at least one first subsection and at least one second subsection alternately arranged along the light travelling direction, each of the at least one first subsection having a diameter D2K−1 and a length L2K−1; and each of the at least one second subsection having a diameter D2K and a length L2K; and a second tapered coupling section coupling the first subsection and the second subsection adjacent to the first subsection, wherein the diameter D2K−1 and the length L2K−1 of the first subsection and the diameter D2K and the length L2K of the second subsection of the Kth optical fiber section and a diameter D2K+1 and a length L2K+1 of the first subsection and a diameter D2K+2 and a length L2K+2 of the second subsection of the (K+1)th optical fiber section satisfy D2K−1>D2K, D2K+1>D2K+2, L2K−1>L2K+1, L2K>L2K+2 and D2K−1=D2K+1, and satisfy D2K>D2K+2 for odd K and D2K<D2K+2 for even K (where N is a natural number, and K is any natural number satisfying 1≤K≤N−1).

Dependencies are inferred from the claim text.