PURPOSE: To realize a fiber type polarizer by an easy method by drawing a desired part of a single-mode optical fiber into a biconical taper shape together with dummy fibers, and sticking a metallic film on the drawn part.
CONSTITUTION: Dummy fibers 21 and 22 having no core are arranged is parallel at both sides of the single-mode optical fiber 1 to contact therewith and fixed temporarily on drawing tables 23 (23a and 23b). Then a part of the contact area is heated to fuse the fiber array, and one drawing table 23, e.g. 23b is moved in parallel in a Z direction to form a fused and drawn part 24 in the biconical taper shape. Then the fiber array is moved to a support plate 25 and fixed with an adhesive 26, and a metallic film 27 is vapor-deposited on the fused and drawn part 24 in a +y and a -y direction. Thus, the fiber type polarizer which has a high extinction ratio and small excessive loss is realized.
KOBAYASHI MORIO
TAKADA KAZUMASA
