The Furukawa Electric Co., Ltd.

Ikuo Ota

Shigehito Yodo

Toshihiko Ota

Koichi Furukawa

Kunio Kokura

Kazunori Watanabe

Yasuhiro Ibusuki

Toshiaki Tsuda

Luksun Li

A grating-type optical component having a high isolation ability at a light-blocking band and a small clad layer mode combination loss at a signal transmission band, and its manufacturing method are provided. A selected area on a core of an optical fiber is irradiated by ultraviolet beams emitted from an excimer laser source through a phase mask in order to produce high index of refraction areas and low index of refraction areas arranged alternately and periodically along the longitudinal axis of the optical fiber. This ultraviolet irradiation is terminated before the index of refraction, which is increasing due to the ultraviolet irradiation, reaches a target value. Then, the phase mask is removed, and the selected area of the core is again irradiated by ultraviolet beams, thereby completing the grating-type optical fiber.

Grating-type optical component and method of manufacturing the same

An optical fiber which comprises a coating layer disposed outside a bare optical fiber having a core and a cladding and a grating formed in the core of the exposed bare optical fiber by removing the coating layer and its manufacturing method. The optical fiber is provided with a re-coating layer disposed in the exposed bare optical fiber.

Optical fiber and its manufacturing method

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Tokyo, Japan

Ikuo Ota