Patent ID: 7292761
Filing Date: 2007-11-06
Classification: G02B

Abstract:
1. An optical transmission device comprising: a condenser which gathers signal light; and a photonic crystal fiber which is connected to the condenser and includes a solid core which constitutes the center of the fiber and a cladding which surrounds the core and has a plurality of holes for transmitting the signal light from the condenser through the core, wherein the holes of the cladding are sealed at an end portion of the photonic crystal fiber connected to the condenser over a predetermined length L from an end face of the fiber and the length L [μm] of the portion of the photonic crystal fiber at which the holes of the cladding are sealed is determined to meet the condition of wherein θ [°] is an incident angle of the signal light with respect to the photonic crystal fiber, D [μm] is an outer diameter of the photonic crystal fiber, a [μm] is a diameter of the core of the photonic crystal fiber and n is a refractive index of the portion of the photonic crystal fiber at which the holes of the cladding are sealed.