Abstract: An optical buffer device includes plural optical memory elements that are capable of holding light and an optical delay element. The plural optical memory elements are arranged on an optical path through which signal light and control light propagate in mutually opposite directions. Further, the optical delay element is disposed between the optical memory elements that are adjacent to each other. The optical delay element imparts different delays to the signal light and the control light. According to a preferred exemplary embodiment of this optical buffer device, each of the optical memory elements includes an optical waveguide through which the signal light and the control light propagate and an optical resonator that is disposed in proximity to this optical waveguide, and a coupling between the optical waveguide and the optical resonator is generated or cancelled depending on whether or not the control light is inputted.

Abstract: A spot size converter has a first core, a larger second core, and a clad disposed on a substrate. The first core has a rectilinear cross-sectional shape and is embedded in the clad, except at its ends. One of these ends has a sloping surface along which the thickness of the first core tapers gradually to zero. The second core, which has a refractive index intermediate between the refractive indexes of the first core and clad, sits on the clad and covers the sloping end surface of the first core. Light propagates through the first core, then through the second core into an external optical device, or propagates from an external optical device through the second core into the first core. This arrangement provides a spot size converter having an easily manufacturable structure and no polarization dependency.

Abstract: A spot size converter has a first core, a larger second core, and a clad disposed on a substrate. The first core has a rectilinear cross-sectional shape and is embedded in the clad, except at its ends. One of these ends has a sloping surface along which the thickness of the first core tapers gradually to zero. The second core, which has a refractive index intermediate between the refractive indexes of the first core and clad, sits on the clad and covers the sloping end surface of the first core. Light propagates through the first core, then through the second core into an external optical device, or propagates from an external optical device through the second core into the first core. This arrangement provides a spot size converter having an easily manufacturable structure and no polarization dependency.

Abstract: An optical resonator includes an optical waveguide with a core surrounded by a clad of lower refractive index. The optical waveguide includes a non-terminated ring-type optical waveguide for resonant propagation of light and an input-output optical waveguide, unitarily coupled to the ring-type optical waveguide, for output of light from the ring-type optical waveguide, or input of light to and output of light from the optical ring waveguide. The ring-type optical waveguide and input-output optical waveguide can be formed simultaneously as silicon-wire waveguides. The unitary coupling simplifies fabrication of the optical resonator.

Abstract: An optical buffer device includes plural optical memory elements that are capable of holding light and an optical delay element. The plural optical memory elements are arranged on an optical path through which signal light and control light propagate in mutually opposite directions. Further, the optical delay element is disposed between the optical memory elements that are adjacent to each other. The optical delay element imparts different delays to the signal light and the control light. According to a preferred exemplary embodiment of this optical buffer device, each of the optical memory elements includes an optical waveguide through which the signal light and the control light propagate and an optical resonator that is disposed in proximity to this optical waveguide, and a coupling between the optical waveguide and the optical resonator is generated or cancelled depending on whether or not the control light is inputted.

Abstract: An organic compound synthesizer for synthesizing organic compounds contains at least one type of polymerizable repeat unit and includes a substrate for organic compound synthesis. A liquid supply unit is configured to supply a reaction liquid containing compounds necessary for the synthesis of organic compounds and a reaction liquid containing a thermal acid generator for generating protons by heating. A substrate heater is configured to selectively heat a specific portion of said substrate for organic compound synthesis to thereby heat the reaction liquid containing a thermal acid generator.

Abstract: In an optical multiplexing/demultiplexing device are arranged in parallel and disposed on a substrate. The optical multiplexing/demultiplexing device is disposed with three or more Mach-Zehnder interferometers between the first and second optical input/output ports. The optical multiplexing/demultiplexing device divides, by wavelength, multiplexed light comprising first light and second light whose wavelengths are different and which are input to one of the first optical input/output ports and outputs the multiplexed light from each of the second optical input/output ports. The absolute value of an optical path difference ?L of each the Mach-Zehnder interferometers is constant. The optical multiplexing/demultiplexing device includes one or more each of a pair of two successive Mach-Zehnder interferometers where the sum of their optical path differences becomes +2 ?L or ?2 ?L and a pair of two successive Mach-Zehnder interferometers where the sum of their optical path differences becomes 0.

Abstract: A wavelength conversion element with a Quasi-Phase Matching structure which can suppress the ripples of fluctuation pulse waveforms of a change efficiency in a frequency band of the waveform conversion, without controlling the positions and dimensions of the polarization regions at high precision. The wavelength conversion element of the present invention has a plurality of first and second polarization regions, formed so that dielectric polarizations are inverted from each other, and an optical wave guide which is formed so as to pass through the first and second polarization regions, in a nonlinear optical substrate. And an absolute value of the wavelength conversion efficiency is set by adjusting the positional coordinates of the first and second polarization regions in a light traveling direction.

Abstract: An optical deflector made of an electro-optic material has one or more pairs of electrodes on opposite surfaces. Each pair of electrodes defines an interaction region in which an electric field applied from the electrodes produces a linear refractive-index gradient in the direction of the electric field. An incident light beam is refracted in this direction within the interaction region. The interaction region is shaped so that the light beam is also refracted in an orthogonal direction when it enters or leaves the interaction region. The light beam is thereby deflected three-dimensionally.

Abstract: A wavelength conversion element with a Quasi-Phase Matching structure which can suppress the ripples of fluctuation pulse waveforms of a change efficiency in a frequency band of the waveform conversion, without controlling the positions and dimensions of the polarization regions at high precision. The wavelength conversion element of the present invention has a plurality of first and second polarization regions, formed so that dielectric polarizations are inverted from each other, and an optical wave guide which is formed so as to pass through the first and second polarization regions, in a nonlinear optical substrate. And an absolute value of the wavelength conversion efficiency is set by adjusting the positional coordinates of the first and second polarization regions in a light traveling direction.

Abstract: A projector projects an image onto an image projection area by scanning the image projection area with a light beam including both image signal light and communication signal light. The image signal light and communication signal light may have different wavelengths, or the communication signal may be modulated onto one or more of the wavelengths of the image signal light. A terminal receives the communication signal light from the image projection area, processes the communication signal, and when necessary, transmits an answering signal to the projector. An audience equipped with such terminals can interact with the projected image at a high data communication rate without impairing the visibility of the image.

Abstract: An organic compound synthesizing device, a light irradiation device, and a substrate for synthesizing an organic compound are provided that can handle rapid modification of the sequence pattern of an organic compound, and synthesize an organic compound that is outstanding in terms of uniformity. The organic compound synthesizing device according to the invention uses light irradiation to synthesizes a polymerized organic compound that includes one, two or more types of polymerizable repeating units. The organic compound synthesis substrate holds an organic material used for synthesizing the organic compound, and the light irradiation device irradiates light that is required for synthesis onto the organic compound synthesis substrate. The organic compound synthesizing device includes the organic compound synthesis substrate and at least one of the light irradiation device.

Abstract: The present invention provides a data communication network that has a link structure that allows a large traffic-handling performance to be obtained with a small network construction cost. In the data communication network of the present invention, the nodes are assigned with m-dimensional coordinates (J1, J2, J3, J4, J5, . . . , Jm?1, Jm), in which any one of the coordinate values J1 to Jm is zero and the other coordinate values are all natural numbers, and each of said node is connected to other nodes which satisfy both of the following conditions (i) and (ii): (i) the coordinate Jp whose value is zero at said other node differs from a coordinate Jq whose value is zero at said node; and (ii) the value of coordinates other than the Jp and the Jq at said the other node all match the corresponding coordinate values of said node.

Abstract: The present invention provides a data transfer network receiving a higher evaluation overall than conventional ones from various perspectives such as the number of effective nodes, the required number of links, and the required maximum node capacity. The present invention is a data transfer network of a hyper configuration in which each node is an element of m (m is 2 or more) different local networks. Further, at least one of the local networks to which the respective nodes belong is a hub network and, when a node belongs to a local network other than a hub network, the local network is a full mesh network.

Abstract: An optical switch includes an input side switching element having a plurality of optical input ports and an output side switching element having a plurality of optical output ports. The input side switching element is provided with an input side optical deflection element group consisting of two optical deflection elements at each of optical input ports. These optical deflection elements are arranged along the direction of incidence of optical signals that are directed into the optical input ports. Respective optical output ports of the output side switching element are provided with a group of output side optical deflection elements consisting of two optical deflection elements. These optical deflection elements are arranged along the direction of emission of optical signals emitted from the optical output ports. With an optical switch of this construction, setting of the deflection angle of the light beams propagated through the space can be achieved with excellent accuracy.

Abstract: This optical switch element comprises mutually intersecting first and second optical waveguides; a cylindrical-shape optical wave-guiding member near the intersecting part; and a heater to control the refractive index of the optical wave-guiding member. Signal light input to a first input port is selectively output from either a first output port or from a second output port. In this optical switch element, the optical wave-guiding member, optical waveguides and cladding are formed such that, when signal light is output from the first output port, the refractive indices of the optical wave-guiding member and cladding are effectively the same.

Abstract: An optical wavelength filter having an optical coupler, for suppressing the generation of a double peak caused by a difference of propagation constants between intrinsic modes of light in an optical coupler. The optical wavelength filter includes first and second optical couplers for exciting multiple modes of light in each wavelength of WDM light and providing a phase difference of p/2 between different modes of multiple modes of light, and a mode converter provided between the first and second optical couplers. The mode converter performs mode conversion between the modes of light belonging to a specific wavelength, whereby the phase difference of each mode of light constituting the light of a specific wavelength, and the phase difference between the modes of light constituting the light of another wavelength, are independently adjusted so as to output light of a specific wavelength and light of another wavelength from separate output ports.

Abstract: An optical switch (26) comprises an input switching element (12) having a plurality of light input ports (10) and an output switching element (16) having a plurality of light output ports (14). The input switching element (12) comprises a plurality of input optical deflector sets (20), each set consisting of a plurality of optical deflectors (18a, 18b), at each light input port (10). The input optical deflectors in each set are arranged in the incident direction of an optical signal that is input to one of the light input ports. The output switching element (16) comprises a plurality of output optical deflector sets (24), each set consisting of a plurality of optical deflectors (22a, 22b), at each light output port (14). The output optical deflectors in each set are arranged in the emergent direction of an optical signal that is output from one of the light output ports.

Abstract: An optical multiplexing/demultiplexing device has a structure wherein a curved waveguide for input, linear waveguides for output, and a planar waveguide are provided within a substrate. The curved waveguide is discontinuous, and the curved waveguide and planar waveguide are separated from each other with an equal interval interposed therebetween. A light signal that is input to the curved waveguide is reflected by discontinuous surfaces of the curved waveguide. Afterwards, the respective reflected light signals are distributed to corresponding linear waveguides through the planar waveguide for every wavelength and focused thereon. Further, the light signals of the respective wavelengths, which are input into the linear waveguides, are multiplexed by and focused on the discontinuous portions of the curved waveguide.

Abstract: The present invention seeks to increase the number of wavelengths capable of being handled while reducing the sub peak and beat noise. A wave router acording to the invention has three acoustooptical filter elements; two wavelength division multiplicity reduction elements; and two wavelength division multiplexers. The wavelength division multiplicity reduction elements have three output ports and one input port, and the wavelength division multiplexing optical signal input to this input port is de-multiplexed and thereafter output from the three output ports. The acoustooptical filter elements are connected to the output ports of the wavelength division multiplicity reduction element, and the optical signal contained in the output light from thee output ports are selectively output in accordance with the wavelength.