Nippon Telegraph and Telephone Corporation

School Juridical Person Kitasato Institute

Ryoko Yoshimura

Satoru Tomaru

Saburo Imamura

Hiroyuki Furukawa

Makoto Hikita

Takeo Miyazawa

Kimiya Shimizu

Kohji Ohbayashi

Fumiyoshi Kano

Takuji Amano

Hideaki Hiro-Oka

DongHak Choi

Motoi Nakanishi

Masahiro Yanagisawa

Toshikazu Hashimoto

Kenji Yokoyama

Yasufumi Yamada

Akio Sugita

Kuniharu Kato

Michiyuki Amano

Hirotsugu Sato

Yasuaki Tamura

Mitsuo Usui

Haruki Kozawaguchi

Yoshito Shuto

Shunichi Tono

Kosuke Katsura

An OCT technique that permits tomographic observation of biological body parts that are difficult to restrain, and also provides a tomographic observation technique for the observation of a constrainable part that does not require constraint and thus removes a burden on the biological body. A wavelength-tunable light generator (wavelength-tunable light source) is employed as the light source of the optical coherence tomography device. The wavelength-tunable light generator has a wave number tunable range width of at least 4.7&#xd7;10&#x3bc;mand an emitted-light frequency width of no more than 13 GHz, for example, and is capable of changing the wave number stepwise at wave number intervals of no more than 3.1&#xd7;10&#x3bc;mand time intervals of no more than 530 &#x3bc;s.

Wavelength-tunable light generator and optical coherence tomography device

The present invention provides an OCT technique that permits tomographic observation of a biological body parts that is difficult to restrain and also provides a tomographic observation technique for the observation of a constrainable part that does not require constraint and remove the burden from biological body. A wavelength-tunable light generator (wavelength-tunable light source) is employed as the light source of the optical coherence tomography device. The wavelength-tunable light generator has a wave number tunable range width of at least 4.7&#xd7;10&#x3bc;mand an emitted-light frequency width of no more than 13 GHz, for example, and includes means capable of changing the wave number stepwise at wave number intervals of no more than 3.1&#xd7;10&#x3bc;mand time intervals of no more than 530 &#x3bc;s.

A packaging platform for optically coupling one or more optical waveguides of one or more optical components having the optical waveguide to one or more optical fibers is provided with a reference structure portion for the horizontal and vertical positioning of the optical component. The platform is further provided with one or more fiber positioning portions for inserting and holding the optical fiber and positioning the optical fiber at a position where the optical fiber is optically connected to the optical waveguide. The provided packaging platform and an optical module using the platform can simplify all alignment steps for optical coupling, electrical connection and sealing in the coupling of the optical component and the optical fiber.

Packaging platform, optical module using the platform, and methods for producing the platform and the module

An optical waveguide of an optical deflector comprising a planar optical waveguide or an optical fiber type optical waveguide is cut while perpendicularly pressing a blade having a blade tip with an angle of inclination against the optical waveguide at a desired location thereof to form an oblique end face serviceable as an oblique end face mirror.

Optical deflector, process for producing the same, and blade for use in

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Kanagawa, Japan

Ryoko Yoshimura