Sumitomo Electric Industries, Limited

Sumitomo Electric Printed Circuits, Inc.

Masakazu Shigehara

Manabu Shiozaki

Makoto Katayama

Tomoya Saeki

Hidehisa Tazawa

Yasushi Fujimura

Munetaka Kurokawa

Kenichiro Takahashi

Takashi Kato

Jun-ichi Hashimoto

Akira Inoue

Takemi Hasegawa

Tomomi Sano

Masatoshi Hayakawa

Tadashi Enomoto

Tomohiko Kanie

Kazuhiro Yamaji

Shigehiro Nagano

Jun Kinugasa

Takashi Sasaki

Yoshiki Kuhara

Masayuki Nishimura

Takashi Yamazaki

Hiromi Kurashima

Kensaku Motoki

Yasuhiro Iguchi

Hiroshi Suganuma

Takashi Iwasaki

Hidetoshi Ishida

Masato Furukawa

Kazuhito Saito

Satoshi Yoshikawa

Naoyuki Yamabayashi

Michiko Takushima

Kohei Kobayashi

Katsumi Uesaka

Shuzo Suzuki

Shunsuke Sato

Akira Yamaguchi

Masaki Suzuki

Goro Sasaki

Hirohisa Saito

Takafumi Ohtsuka

Kenichi Watatani

Hiroyuki Yoshinaga

Keiji Fuse

Takahiro Sunaga

Kazuhiro Yonezawa

Iwao Okazaki

Toru Iwashima

Kiyotaka Murashima

Masaki Furumai

Yoshihiro Akahane

Toshikazu Shibata

Kenji Ohki

Ken Hashimoto

Hitoshi Terauchi

Manabu Yoshimura

Kei Sunaga

Kazunori Yoshida

Katsuhisa Tawa

Tamoya Kenmochi

Tetsuya Iimura

Dai Yui

Naoki Karikomi

Teruo Ikechi

Norihiro Uenoyama

Masaru Furusyou

Disclosed is an optical device including a first lens and a second lens. The first lens of the optical device is joined to an end surface of an optical waveguide of an optical element to emit light emitted from the optical element. The second lens is optically coupled with the first lens to convert the light emitted from the first lens into collimated light.

Optical device

One embodiment of the present disclosure relates to an SFG (slanted fiber grating) that can easily realize a high-performance gain equalizer. The SFG includes an optical fiber comprised of silica-based glass and including a core, a first cladding containing a photosensitive material, and a second cladding. A specific section between two different points arranged along a fiber axis in the optical fiber is configured with a first region, a pair of second regions, and a third region. The first region includes a slanted Bragg grating provided in a region as the first cladding. The pair of second regions are arranged to sandwich the first region. The third region is disposed to sandwich both the first region and the pair of second regions. An MFD at a wavelength of 1.55 &#x3bc;m in the third region is smaller than an MFD at a wavelength of 1.55 &#x3bc;m in the first region.

Slant-type fiber grating

An optical fiber preform including a glass material and a refractive index adjusting additive is disclosed. This preform has striae due to difference in concentration of the additive and the striae have concentric refractive index periodicity in at least a part thereof from a radial center of the preform to an outer periphery thereof. The respective striae pitches each indicating a period of the refractive index periodicity increase from the center of the preform to the outer periphery thereof.

Optical fiber preform, method for manufacturing optical fiber preform, and method for setting striae pitch of optical fiber preform

An optical fiber is made of silica-based glass and includes a core, a first cladding that surrounds the core and that has a refractive index lower than a refractive index of the core; and a second cladding that surrounds the first cladding and that has a refractive index lower than the refractive index of the core and higher than the refractive index of the first cladding. At least a part of the first cladding contains a photosensitive material whose refractive index increases by irradiation with light having a specific wavelength. A difference &#x394;n between a refractive index of a portion of the first cladding, the portion being nearest to the core, and the refractive index of the core is in a range of 0.25% to 0.30%. The radius ra of the core is larger than 4.3 &#x3bc;m and smaller than or equal to 5.0 &#x3bc;m.

Optical fiber and slanted fiber grating

An optical module with a laser diode (LD) without any temperature control and an optical fiber that is coupled with the LD through the two lens system is disclosed. The two lens system first converts laser beam into collimated beam and second concentrates the collimated beam onto the optical fiber. A beam splitter is disposed between the lenses and splits the collimated beam toward a photodiode (PD). The PD, which receives the split collimated beam in a back surface thereof, provides an anti-reflection film in the back surface. The anti-reflection film eliminates multi reflections occurred within the PD.

Optical module having two lens system and monitor photodiode between two lenses

An optical coupling system to couple a collimated beam with a waveguide made of semiconductor materials is disclosed. The waveguide is implemented in an optical modulator and/or an optical hybrid, and has a core with a restricted cross section because of the enhanced refractive index of the semiconductor materials. The collimated beam is focused on the core by the two-lens system including first and second lenses. The first lens, having a focal length shorter than a focal length of the second lens, is first aligned with the core, then, the second lens is aligned with the core as compensating deviations of the first lens induced during the fixation thereof.

Method of coupling optical signal optically with optical waveguide through two lens system

Lens system to enhance optical coupling efficiency of collimated beam to optical waveguide

An embodiment of the invention relates to a GI-MMF with a structure for achieving widening of bandwidth in a wider wavelength range and improving manufacturing easiness of a refractive index profile in a core. In an example of the GI-MMF, a whole region of the core is doped with Ge and a part of the core is doped with P. Namely, the Ge-doped region coincides with the whole region of the core and the Ge-doped region is comprised of a partially P-doped region doped with Ge and P; and a P-undoped region doped with Ge but not intentionally doped with P.

Multimode optical fiber

A quantum cascade laser includes a substrate having a principal surface; a laser body region disposed on the principal surface, the laser body region including a semiconductor laminate structure having an end facet, the laser body region having a waveguide structure extending along a waveguide axis; and a distributed Bragg reflection region disposed on the principal surface, the distributed Bragg reflection region including low and high refractive index portions that are alternately arranged in a direction of the waveguide axis. The end facet of the semiconductor laminate structure is optically coupled to the distributed Bragg reflection region. Each of the high refractive index portions includes a semiconductor wall including upper and lower portions that are arranged in a direction intersecting with the principal surface of the substrate. The principal surface is disposed between the upper and lower portions. The lower portion includes a part of the substrate.

Quantum cascade laser

An LED module according to the present invention is an LED module including a plurality of light-emitting diodes, wherein the plural light-emitting diodes are disposed only on a lateral surface of a right cone, a right pyramid, a truncated right cone, or a truncated right pyramid; the lateral surface has an inclination angle of 55&#xb0; or more and 82&#xb0; or less with respect to a bottom surface; the plural light-emitting diodes have light-emitting surfaces substantially parallel to the lateral surface; and angles formed between projection lines of lines normal to light-emitting surfaces of adjacent light-emitting diodes or adjacent ones of grouped light-emitting diodes, the projection lines being drawn on the bottom surface, are all equal to each other and are 72&#xb0; or less.

LED module including flexible printed circuit board with adhesive layers and LED lighting fixture

A wavelength selective switch includes a dispersion optical system dispersing wavelength multiplexing light obtained by multiplexing the plurality of frequency components to the plurality of frequency components by giving a dispersion angle having nonlinear frequency dependency to each of a plurality of frequency components; a light deflection element deflecting the plurality of frequency components; a condensing element condensing the plurality of frequency components on the light deflection element; and a prism optical system optically coupled to the dispersion optical system and the condensing element, and adapting spatial positions of the frequency components incident on the light deflection element to change linearly for frequencies by linearizing the frequency dependency of the dispersion angles and making incident the plurality of frequency components on the condensing element.

Wavelength selective switch

An apparatus includes a susceptor and a protective pipe. A gas containing 50% or more of argon or nitrogen is used as a gas to be supplied into the susceptor. The protective pipe has a heat insulating region () enclosed with a heat insulator () with a length of Db (mm) at the upper section thereof and a non-heat insulating region () not enclosed with any heat insulators at the lower section thereof. The temperature of the glass fiber at the outlet of the protective pipe becomes 1700&#xb0; C. or less. The outer diameter of the glass fiber at the outlet of the protective pipe is within a range of the target outer diameter of the glass fiber+6 &#x3bc;m or less.

Optical fiber producing method and apparatus and optical fiber

A wavelength selective switch includes a wavelength dispersive element that divides a beam input from an input port, a beam director that deflects a wavelength component, and a free space optical system that optically couple a input/output unit, the wavelength dispersive element, and the beam director. The free space optical system converts a shape of the beam such that a size extending in a second plane is relatively smaller than a size extending in a first plane, and to have a long axis and a short axis in a third plane. The long axis is inclined with respect to the first direction. The beam director includes a beam directing region in which a plurality of beam directing elements are arranged. The beam directing region deflects the respective wavelength components toward the predetermined output port. The beam directing region is provided to correspond to the shape of the beam.

A dispersive device has a beam expanding optical system which includes first and second prisms each having a pair of faces inclined relative to each other, and expands light containing a plurality of wavelength components by passing the light through each of the faces of the first and second prisms; and a dispersive element which emits the light expanded by the beam expanding optical system, at different diffraction angles by the respective wavelength components. A direction of variation of an output angle of the light emitted from the beam expanding optical system due to temperature change is configured to be a direction to suppress variation of the diffraction angles of the respective wavelength components emitted from the dispersive element due to the temperature change.

Dispersive device having beam expanding optical system and dispersive element and wavelength selective switch having dispersive device

A wavelength selective switch includes: a port array that includes an input port for inputting a signal light and an output port for outputting the signal light which are arranged in a first direction; a dispersive element that disperses the signal light in a second direction; a condensing element that condenses signal lights; a light deflection element that deflects the signal lights toward the output port; a first optical system that matches a beam waist position of the signal light incident onto the condensing element with a front focus of the condensing element in the optical axis direction, in a first plane that extends in the first direction; and a second optical system that shifts the beam waist position of the signal light incident onto the condensing element from the front focus in the optical axis direction, in a second plane that extends in the second direction.

Growing community of inventors

Yokohama, Japan

Manabu Shiozaki