Nippon Telegraph and Telephone Corporation

Ai Yanagihara

Kenya Suzuki

Keita Yamaguchi

Takashi Go

Kota Shikama

Osamu Moriwaki

Yusuke Muranaka

Hidetaka Nishi

Yuko Kawajiri

Shuichiro Asakawa

Ryoichi Kasahara

Kazunori Seno

A waveguide bend which has low loss while keeping the curvature radius small in a waveguide with a given A is realized. An optical waveguide has a straight waveguide and a waveguide bend connected to each other, and tapered waveguide bends inserted between the straight waveguide and the waveguide bend, a curvature radius of the tapered waveguide bend being equal to a curvature radius of the waveguide bend, a waveguide width of the tapered waveguide bend changing continuously from the waveguide width of the straight waveguide at the connection point to the waveguide width of the waveguide bend. A waveguide width of the waveguide bend is larger than a waveguide width of the straight waveguide at a connection point and the tapered waveguide bend and the straight waveguide are connected with an optical axis of the tapered waveguide bend and an optical axis of the straight waveguide being offset.

Optical waveguide

In a waveguide having a given Δ, a low-loss waveguide bend is realized while the curvature radius is kept small. In an optical waveguide in which a first waveguide and a second waveguide are connected, a clothoid tapered waveguide bend is inserted between the first waveguide and the second waveguide. In the clothoid tapered waveguide bend, the waveguide width continuously changes from a first waveguide width at a connection point of the first waveguide to a second waveguide width at a connection point of the second waveguide, the curvature radius continuously changes from a first curvature radius at the connection point of the first waveguide to a second curvature radius at the connection point of the second waveguide, the first waveguide width and the second waveguide width are different from each other, and the first curvature radius and the second curvature radius are different from each other.

The present invention realizes an optical signal processing device that enables using a thermal oxidation silica film as the under clad of a silica PLC while also increasing the thickness of the under clad and reducing the time required for film growth during manufacturing. The optical signal processing device is formed as a planar optical circuit that includes an optical waveguide formed on a silicon substrate, and has a phase modulation element that employs a thermo-optical effect. A plurality of silica films are provided between a core of the optical waveguide and the silicon substrate, and at least one of the silica films was formed by thermal oxidation.

Optical signal processing apparatus and manufacturing method thereof

In order to reduce the number of power driving elements, an optical signal processing device includes a control unit, a current generation unit, a connection portion, and an optical signal processing unit, the current generation unit includes one or a plurality of power driving elements s, the optical signal processing unit is an optical waveguide on a substrate, and a plurality of driven elements are connected in parallel to an identical one of the plurality of power driving elements and are driven.

Optical signal processing apparatus

To provide an optical signal processing device capable of reducing the crosstalk while narrowing the space between switch elements for downsizing, the optical signal processing device includes a plurality of input optical waveguides, a plurality of output optical waveguides, a plurality of optical waveguide elements arranged between the plurality of input optical waveguides and the plurality of output optical waveguides, and a connection optical waveguide. The connection optical waveguide positioned closely to the optical waveguide element is differentiated in propagation constant from the optical waveguide configuring the closely arranged optical waveguide element. The connection optical waveguide positioned closely to the optical waveguide element is a connection optical waveguide having one end or both ends connected to the optical waveguide element, or a connection optical waveguide having both ends not connected to the optical waveguide elements.

The positions at which electrode pads are arranged can be made more flexible, and electrical interconnects to be installed can be reduced. In addition, the degree of integration of a chip increases, making it possible to realize a large-scale device (optical switch etc.). In an optical module of the present invention, an interposer (an electrical connection intermediary component with electrode pins attached onto upper and lower faces in an array) is laid over a chip that includes a device configured by using a planar lightwave circuit (PLC) fixed onto a fixing metal plate, and a control substrate for driving the device is laid over the interposer. These components are mechanically fixed by a fixing screw or the like, and the electrode pads of the chip and the control substrate are connected to each other via the interposer.

Optical module

Optical alignment between an optical waveguide device and an optical connection part is realized easily and at low cost. An optical circuit in which optical waveguides to be connected to optical fibers are formed includes: an alignment optical waveguide configured to be opposed to, on an optical waveguide edge face to which an optical connection part having guide holes for insertion of core wires of the optical fibers is to be fixed, a guide hole into which an alignment optical fiber is to be inserted; and a light path changing member configured to change a path of light to a vertical direction with respect to the optical axis direction of the core of the alignment optical waveguide.

Optical circuit and optical connection structure

There is provided an optical connection structure in which an optical fiber and an optical semiconductor waveguide are easily connected with low loss. The present invention relates to an optical connection structure configured to connect an optical waveguide device and an optical fiber including cores having different refractive indexes, wherein an optical connection component using a planar lightwave circuit is bonded and fixed on an end surface of an input/output waveguide of the optical waveguide device, a value of a refractive index of a core of the planar lightwave circuit is between a value of the refractive index of the core of the optical waveguide device and a value of the refractive index of the core of the optical fiber, and the optical waveguide device and the optical fiber are optically connected via the planar lightwave circuit.

Optical connection structure

An optical switch is configured by providing a planar lightwave circuit layer on a top surface of a Si substrate. The circuit layer forms, on the top surface of the substrate, an optical waveguide including an underclad layer, an optical waveguide core, and an overclad layer. The optical waveguide is provided to have a structure configuring a Mach-Zehnder interferometer. A heater is provided at a position just above an arm of the core on the top surface of the clad layer, and power supply electric wires are electrically connected to both ends of the heater. In a local portion including an interface between the clad layer and the top surface of the substrate, trench structure portions as concave grooves are provided.

Optical module and manufacturing method thereof

A problem is to provide a planar lightwave circuit optical device capable of facilitating mounting of connection to a printed circuit board and realizing downsizing of a device chip. A planar lightwave circuit optical device of the present invention is characterized by mounting an electrical connector (FPC connector) by means of soldering on an electrode pad of an electrical wire connected to an electrical drive unit (such as a heater) in a device formed by using a planar lightwave circuit (PLC).

Planar-lightwave-type optical device

Provided is an optical fiber connection component in which an optical waveguide of a planar lightwave circuit and an optical fiber can be connected after a process using SMT and reflow mounting technology. The optical fiber connection component includes: a plurality of fiber guide holes into which optical fibers are insertable at intervals equal to intervals of a plurality of optical waveguides of the planar lightwave circuit; and grooves for demarcating an area provided with the plurality of fiber guide holes and an area coated with an adhesive in an end surface to be joined with the planar lightwave circuit. The plurality of optical waveguides and the plurality of fiber guide holes are respectively aligned and fixed to the planar lightwave circuit with the adhesive in advance.

Optical fiber connection component and optical device manufacturing method

An optical fiber guide part fixes optical fibers optically connected to optical waveguides of an optical waveguide device and is adhesively fixed to the optical waveguide device. The optical fiber guide part includes a V-grooved substrate, in a surface of which plural V-grooves are formed in parallel to one another, a lid member fixed to a top of the V-grooved substrate such that the V-grooves are exposed in a neighborhood of at least that end face of the V-grooved substrate which is on a side of the optical waveguide device, and a lid member fixed to an exposed part of the V-grooves of the V-grooved substrate, pressing, from above, the optical fibers inserted in guide holes formed by the V-grooves and the lid member placed on the V-grooves.

Optical fiber guide component, optical connection structure and method for producing same

An optical signal processing device is described herein for reducing electric wirings in an optical switch or an optical filter realized using an optical waveguide. The optical signal processing device includes an optical waveguide formed on a substrate. In the optical signal processing device, the optical waveguide includes at least one input port and at least one output port, a plurality of driven elements are provided including a phase shifter that produces a phase shift to an optical signal from the input port, each of the driven elements includes at least two control terminals, control wirings are provided to have control signals being time-division synchronized applied between the two control terminals, and the control wiring for accessing the driven element is shared by the plurality of driven elements.

Optical signal processing device and method for controlling same

An optical module according to the present invention includes: a first plasmonic waveguide having one end formed of a first metal layer formed over an end portion of a first substrate, and having another end connected to one end of a first optical waveguide; a second metal layer that is formed on a side surface continuous with the end portion of the first substrate and formed to be continuous with the first metal layer; a second substrate provided with a second plasmonic waveguide formed of a third metal layer; and a second optical waveguide that is connected to the second plasmonic waveguide and formed on the second substrate, wherein the second metal layer and a part of the third metal layer are joined together to connect the first substrate to the second substrate.

Provided is a variable wavelength filter having a wide variable wavelength range. In the variable wavelength filter, a slab waveguide that is a component of an arrayed-waveguide grating has a groove into which a resin is inserted. The groove intersects with a plurality of line segments A joining a place of connection between an input light waveguide and the slab waveguide to places of connection between respective array waveguides and the slab waveguide. The groove is formed such that a total length LA of an intersection of the groove and each of the line segments A monotonously increases or decreases between the adjacent line segments A with a difference in the total length LA between the adjacent line segments A being constant.

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Musashino, Japan

Ai Yanagihara