Fujitsu Corporation

Akio Sugama

Hiroaki Suzuki

Naomi Kojima

Masayuki Kato

Shinya Sasaki

Masatoshi Ishii

Tsuyoshi Aoki

Shigenori Aoki

Yasuo Yamagishi

Koji Tsukamoto

Shozo Fujita

Motoyuki Nishizawa

Tomoyuki Akahoshi

Kishio Yokouchi

Fumio Takei

Takayoshi Matsumura

Naoaki Nakamura

Takafumi Hashitani

Koji Asano

Teruo Yagishita

Hachiro Yasuda

Naomi Nakane

A wavelength demultiplexer includes a photonic circuit and a control circuit that adjusts wavelength characteristics of the photonic circuit. The photonic circuit converts two orthogonal polarized waves contained in the incident light into two same polarized waves, which are supplied to a first optical demultiplexing circuit and a second optical demultiplexing circuit provided in the photonic circuit and having the same configuration. The photonic circuit supplies a total output power of monitor lights extracted from the same positions in the first optical demultiplexing circuit and the second optical demultiplexing circuit to the control circuit. The control circuit controls a first wavelength characteristic of the first optical demultiplexing circuit and a second wavelength characteristic of the second optical demultiplexing circuit based on the total output power of the monitor lights.

Wavelength demultiplexer, optical transceiver front-end module, photonic circuit, and wavelength demultiplexing control method

An optical module includes a circuit board having, an electronic circuit formed therein and an optical circuit mounted thereon, and coupled to a first end of an inner optical fiber, a connector assembly to which a second end of the inner optical fiber is fixed, and a housing including a first housing including a slid surface on which a sliding surface included in the connector assembly slides so as to position the connector assembly, a second housing including an engaging protrusion engaged with the positioned connector assembly so as to fix the connector assembly, the second housing being bonded to the first housing and the housing being mounted with the circuit board.

Optical module and method of manufacturing the same

An optical branching waveguide disclosed herein includes: a substrate; a first optical waveguide provided on the substrate; a second optical waveguide provided on the substrate and arranged close to the first optical waveguide; and a cladding layer covering either one of a first portion of the first optical waveguide and a second portion of the second optical waveguide and including an opening the other one of the first portion and the second portion. The effective refractive index of the first optical waveguide at the first portion and the effective refractive index of the second optical waveguide at the second portion become equal in either one of a state where resin is present in the opening and a state where the resin is not present in the opening.

Optical branching waveguide and optical module

The invention relates to a grating coupler and an optical waveguide device having a stripe width that can be easily realized where light is transferred by means of a beam of which the form is close to that of a Gaussian beam. A striped member that becomes a grating and that is formed of a material of which the refractive index is different from that of the core layer is divided into a plurality of sections, and at the same time, the distance between the core layer and the surface of the striped member on the side opposite the surface that faces the core layer is different for each section.

Grating coupler and optical waveguide device

A wavelength multiplexer and de-multiplexer includes: a reflection member; a first port provided in the reflection member; a plurality of second ports provided in the reflection member to be spaced apart from the first port; and an optical filter on an optical path between the first port and the plurality of second ports, wherein a plurality of reflection surfaces inclined with respect to the optical filter are formed in the reflection member, a distance of a reflection point from the optical filter in each of the plurality of reflection surfaces becomes smaller as a reflection angle in each of the plurality of reflection surfaces is increased, and each of the plurality of second ports is positioned on a path of light reflected by each of the plurality of reflection surfaces.

Wavelength multiplexer/demultiplexer and optical module

An optically interconnected chip includes a first optical transmitter circuit, a first spot size converter connected by a first optical waveguide to the first optical transmitter circuit, a first optical receiver circuit, a second spot size converter connected by a second optical waveguide to the first optical receiver circuit, a rotator provided between the second spot size converter and the first optical receiver circuit and configured to rotate a direction of polarization of light propagating through the second optical waveguide by 45 degrees, and a splitter provided after the rotator and configured to separate the rotated light into components according to directions of polarization of the light, wherein the first spot size converter and the second spot size converter are coupled directly to each other on a wafer.

Optically interconnected chip, method of testing the same, and optical receiver

Disclosed is an electronic apparatus including a circuit element including a first main surface, a first electrode provided in the first main surface, an optical element including a second main surface and being configured to either transmit or receive an optical signal, a second electrode provided in the second main surface, a window which is provided in the second main surface and through which the optical signal passes, a wiring layer provided on the first main surface and the second main surface, the wiring layer electrically connecting the first electrode and the second electrode, and an optical waveguide, which is provided on the second main surface and optically connected to the window, the optical signal passing through the optical waveguide.

Electronic apparatus, method for manufacturing electronic apparatus, and electronic device

An optical waveguide component includes: an optical fiber mounting substrate provided with optical fiber alignment grooves having either, for alignment of optical fibers, V-grooves or inverted trapezoidal grooves in which inverted top sections of the V-grooves are truncated; an optical waveguide substrate in which optical waveguides are formed; a resin layer that is aligned and fixed in a state in which the optical fiber mounting substrate and the optical waveguide substrate are flush or have a predetermined amount of offset; and a transparent resin that is filled in a gap in which the optical fiber mounting substrate and the optical waveguide substrate face each other.

Optical waveguide component, manufacturing method therefor, and optical waveguide device

An optical module with a first optical waveguide substrate having end faces; a second optical waveguide substrate which includes a first optical waveguide, a second optical waveguide, and end faces, the second optical waveguide substrate having an opening between the first optical waveguide and the second optical waveguide; and a first deflection device which is mounted in the opening, wherein one of the end faces of the first optical waveguide substrate and one of the end faces of the second optical waveguide substrate are coupled to each other.

Optical module method of manufacturing the same

Disclosed is an optical waveguide structure capable of keeping intervals between the structure and optical elements within a certain range. When arranging a surface light emitting element and a surface light receiving element on a positioning plate provided on a substrate, elastic layers are provided between the elements and the plate. When fitting and fixing first projections of the structure in holes of the plate, second projections formed in a predetermined dimension on the structure are brought into contact with the light emitting element and the light receiving element. Therefore, intervals between lenses, and the light emitting element as well as the light receiving element are controlled within a certain range according to the dimension of the second projections. Further, stress occurring due to contact is dispersed by the elastic layers so that breakage of the light emitting element and the light receiving element can be prevented.

Optical waveguide structure, optical module and lens array

An optical module with a plurality of optical waveguide substrates having element mounting openings and end surfaces which are adhered to each other with an optical adhesive; and a plurality of light deflecting element arrays mounted to the respective element mounting openings of the plurality of optical waveguide substrates, the plurality of light deflecting element arrays including a plurality of light deflecting elements.

An optical waveguide and a first lens are formed on an underlying surface. The optical waveguide guides light along a first direction. The first lens is continuous with one end of the waveguide and converges light radiated from the end plane of the optical waveguide and diverging along directions parallel to the underlying surface. A second lens converges light transmitted through the first lens and diverging along directions perpendicular to the underlying surface. A support member supports the first and second lenses. It is possible to prevent a shift of positions of the optical waveguide and lens to be caused by a temperature change and to prevent a light coupling efficiency from being lowered.

Optical transmission device with optical waveguide coupled to optical device

An optical wiring substrate provides a slab optical waveguide having a refractive index different from a refractive index of other surrounding portions and a planar convex lens being provided continuously to a tip portion of an optical path of an optical wave guide including a core and cladding and formed on a substrate. The optical path of light passing through the planar convex lens is converted approximately by 90&#xb0; with a mirror. The light reflected with the mirror is made as parallel light rays by use of a cylindrical lens.

Optical wiring substrate, method of manufacturing optical wiring substrate and multilayer optical wiring

The waveguide-type optical device comprises a optical transmission element, an optical waveguideoptically connected to the optical transmission element, and a slab optical waveguideformed of an electrooptic material and optically connected to the optical waveguide. In the waveguide-type optical device, a mode field width of the optical waveguidehas a value which is between a mode field width of the optical transmission element and a mode field width of the slab optical waveguide, whereby the connection loss between the optical transmission element, such as an optical fiber, etc. and the slab optical waveguidecan be small.

Waveguide-type optical device and optical switch

An optical switch is arranged to have so simple a structure that the switch may be reduced in size. The optical switch includes an input waveguide for accepting an optical signal inputted from the outside, a plurality of output waveguides for outputting the optical signals to the outside, a collimate lens for collimating the optical signal passed through the input waveguide, an optical deflector element for switching the propagating direction of the collimated optical signal, a common waveguide through which the optical signal passed through the optical deflector element is propagated, and a light-condensing portion having a plurality of light-condensing lenses integrally formed therein, each of those lenses serving to image the optical signal inputted from the optical deflector element through the common waveguide onto each output waveguide.

Growing community of inventors

Kawasaki, Japan

Akio Sugama