1
Atsuko Fukushima, Yasuo Hira, Hidemi Sato, Kazumi Kawamoto, Kenchi Ito, Masataka Shiba, Akira Arimoto: Optical integrated circuit and optical apparatus. Antonelli Terry Stout & Kraus, December 3, 1991: US05070488 (53 worldwide citation)

An optical integrated circuit and an optical apparatus used in optical communication or an opto-electronics apparatus such as an optical disk recording apparatus, in which various kinds of aberration caused by wavelength variation of a light source when a semiconductor laser is used as the light sou ...


2
Hidemi Sato, Yasuo Hira, Atsuko Fukushima, Hiroshi Asao, Kazumi Kawamoto, Kenchi Ito, Ryuichi Funatsu: Method and apparatus for measuring optical constants of a thin film as well as method and apparatus for fabricating a thin film utilizing same. Hitachi, Fay Sharpe Beall Fagan Minnich & McKee, June 30, 1992: US05125740 (24 worldwide citation)

A sample is located so as to be close to a prism and a light beam coming from a light source is projected to the prism while varying the incident angle to the prism as a parameter. The incident light beam to the prism is propagated therein and light emerging from the bottom surface of the prism, whi ...


3
Kazuo Yamaguchi, Takashi Minato, Shinzoo Nishiyama, Atsushi Murata, Naohiko Baba, Tsutomu Yoshiya, Kazumi Kawamoto, Kyouichi Yamamoto, Kazuo Aoyama: Method for manufacturing optic transmission modules and system for inspecting bit error rate characters. Hitachi, Antonelli Terry Stout & Kraus, December 9, 2003: US06661503 (22 worldwide citation)

A method of manufacturing an optic transmission module assures a high reliability for the module by inspecting the character of a low bit error rate (BER) of the module quickly and accurately. The module is employed in an optical communication system (light transmission system) required to cope with ...


4
Kenchi Ito, Kazumi Kawamoto, Hiroshi Momiji, Yasuo Hira, Hidemi Sato, Atsuko Fukushima: Second harmonic generator and method of fabrication thereof. Hitachi, Antonelli Terry Stout & Kraus, December 28, 1993: US05274727 (16 worldwide citation)

A second harmonic generator having a wide acceptance of bandwidth of temperature and/or a high conversion efficiency and a method of fabrication thereof are disclosed. An equidistant arrangement of pole-inverted grating having a rectangular sectional profile and the direction of spontaneous polariza ...


5
Makoto Torigoe, Kazumi Kawamoto, Takashi Suga, Hiroyasu Sasaki, Fumitoshi Goto: Optical transmission module. OpNext Japan, Townsend and Townsend and Crew, January 10, 2006: US06985659 (14 worldwide citation)

The present invention relates to an optical transmission module comprising two substrates, each of which has an electronic part mounted on the substrate and a terminal area for inputting/outputting an electric signal into/from the electronic part, wherein an electrical connection is made between the ...


6
Kenchi Ito, Kazumi Kawamoto, Naoya Kanda, Yasuo Hira, Hidemi Sato, Atsuko Fukushima, Masataka Shiba, Akira Inagaki, Minoru Yoshida: Optical information storing apparatus and method for production of optical deflector. Hitachi, Antonelli Terry Stout & Kraus, March 2, 1993: US05191624 (12 worldwide citation)

An optical waveguide is comprised of an optical substrate and an optical thin-film optical waveguide layer and formed such that ##EQU1## where .theta. is an output angle, n.sub.o1 is an ordinary refractive index of the optical substrate for an ordinary beam, n.sub.e1 is an extraordinary refractive i ...


7
Sten Helmfrid, Kenchi Ito, Kimio Tatsuno, Kazumi Kawamoto, Tetsuo Andou, Hiroshi Momiji, Osamu Komoda, Hisao Kurosawa, Masayoshi Sato, Fumio Nitanda, Kohei Ito: Short-wavelength laser light source. Hitachi, Hitachi Metals, Antonelli Terry Stout & Kraus, December 29, 1998: US05854870 (10 worldwide citation)

There is disclosed a harmonic modulation device of waveguide type including a semiconductor laser, a waveguide for generating a nonlinear optical harmonic of the semiconductor laser by keeping phase matching, means for leading an optical beam of the semiconductor laser to the waveguide, electrodes d ...


8
Masataka Shiba, Kazumi Kawamoto, Yasuo Hira, Akira Inagaki, Hidemi Sato, Kenchi Ito, Atsuko Fukushima, Ryuichi Funatsu: Optical information processing apparatus and optical pickup therefor. Hitachi, Antonelli Terry Stout & Kraus, March 16, 1993: US05195070 (9 worldwide citation)

Using an optical pickup, recording/reproducing of information is performed by irradiating light beams to an optical recording medium to form light spots. The optical pickup includes means for generating plural light beams, an optical waveguide for guiding the plural light beams in a row into a flat ...


9
Shigenobu Maruyama, Kazumi Kawamoto, Hiroaki Furuichi, Tooru Yoshida, Isamu Yoshida, Katsuya Oono, Osamu Yamada, Hiroshi Ibe, Shigeru Tokita, Tarou Tonoduka, Yasunori Iwafuji, Katsumi Kuroguchi: Optical communication module. Hitachi, Townsend and Townsend and Crew, May 8, 2007: US07215886 (9 worldwide citation)

The present invention is related to an optical communication module for transmitting high frequency signals (e.g., 10 Gbit/s and higher data rates) between an optical element and an external circuit. In an illustrative embodiment, the optical communication module includes signal transmission lines a ...


10
Kimio Tatsuno, Hiroaki Furuichi, Kazumi Kawamoto, Katsumi Kuroguchi: Laser diode module. Hitachi, Antonelli Terry Stout & Kraus, July 22, 2003: US06597712 (9 worldwide citation)

In a wavelength locking optical system, a resonator is formed between a wavelength deviation detection device and a facet of the laser diode, which makes a control signal unstable. A solution to this problem is to arrange polarization controlling elements between a wavelength deviation detection fil ...