Patent ID: 7477821

Claim:
A sealing composition comprising a compound defined by the following general formula (I), a compound defined by the following general formula (II) and a photo-polymerization initiator and usable to seal air holes of an optical fiber having air holes in the inside: Tf1-(O) a —(CH 2 ) b —(CF 2 ) m —(CH 2 ) b —(O) a -Tf1 (I) Tf2-(O) a (CH 2 ) b —(CF 2 ) m —(CH 2 ) b —(O) a -Tf2 (II) wherein in the formulas (I) and (II), the respective reference characters a denote identically 0 or 1; the respective reference characters b denote identically 0 or 1; m denotes an integer of 4 to 12; Tf1 denotes a glycidyl group; and Tf2 denotes CH 2 =CH—C(O)—, and wherein the optical fiber having air holes in the inside is a photonic crystal fiber.