Ntt Advanced Technology Corporation

Nippon Telegraph and Telephone Corporation

Hamamatsu-photonics K.k.

Eiichi Sugai

Shogo Yagi

Takeshi Watanabe

Takashi Sakamoto

Koei Yamamoto

Kazuo Fujiura

Seiji Toyoda

Masatoshi Fujimoto

Kazunori Naganuma

Tadashi Sakamoto

Joji Yamaguchi

Yuzo Sasaki

Koji Yoneyama

Fumio Saito

Yukihiko Ushiyama

Tohru Kodaira

Akira Sawaguchi

Motoyuki Atoji

Hideki Hagino

Noriyuki Ishidu

Hiizu Takemura

Mahiro Yamada

Provided is a position locating instrument for a position locating method in which position locating instruments that transmit and receive light beams are arranged in series connection. The position locating instruments reduce error factors and improve measurement accuracy by providing all or some of necessary position and attitude parameters. The position locating instrument has at least one light emission port through which light from a wavelength-changeable light source is emitted; and at least one light receiving port that receives light emitted or reflected by an adjacent position locating instrument. The light emitted from the light emission port has a fanlike pattern and has an emission angle varying, as a monotonic function of a wavelength of the light, in a direction perpendicular to a direction in which the light spreads in the fanlike pattern.

Position locating instrument

Provided is a swept light source including one end surface coupled to a wavelength filter constituted of a diffraction grating and an end mirror via a light deflector and another end surface including a gain medium facing an output coupling mirror and which configures a laser cavity between the end mirror and the output coupling mirror, wherein a drive voltage having an AC voltage on which a DC bias voltage is superimposed is output from a control voltage source of the light deflector to an electrode pair of an electro-optic crystal, light is radiated from a light emitter to the electro-optic crystal, and incident light from the gain medium incident along an optical axis perpendicular to a direction of an electric field formed by the control voltage is deflected in a direction parallel to the electric field, so that wavelength sweeping is performed.

Swept light source and method for controlling the same

An optical circuit includes a light source having a low degree of polarization, an input section connected to the light source, and an output section connected to the input section. The input section has an optical waveguide incapable of maintaining a state of polarization. The output section has at least one optical waveguide having no branches. The optical waveguide having no branches has, in at least part thereof, an optical waveguide capable of maintaining a state of polarization.

Method and apparatus for maintaining optical signal having low degree of polarization in specific state of polarization

Growing community of inventors

Ebina, Japan

Eiichi Sugai