Abstract: A photoelectric composite connector comprises a first connector unit which is connected to optical transmission means and a second connector unit which can be attached to and detached from a first connector unit freely. The first connector unit comprises a photoelectric conversion module and an electrical connector section having a first conductor which is electrically connected to the photoelectric conversion module. The second connector unit is formed as an electrical connector unit corresponding to the electrical connector section of the first connector unit and having a second conductor. The first conductor of the electrical connector section of the first connector unit and the second conductor of the second connector unit are electrically connected to each other when the electrical connector section of the first connector unit and the second connector unit are connected to each other by use of their electrical connector structures.

Abstract: A high-speed optical communication system for transmitting and receiving an optical signal is disclosed. A contents receiver transmits previously given unique identification information by using a light less intensive than the intensity level of a pre-given threshold. When a contents transmitter receives the identification information transmitted from the contents receiver, it transmits contents data to the receiver by using a laser.

Abstract: A board-mounted optical connector is provided which enables high-density wiring of optical fibers on a board. The board-mounted optical connector is a board-mounted optical connector having a housing comprising: a first housing component, and a second housing component. The first housing component has a housing space accessible through an opening formed in at least a portion of a side wall and houses portions of optical fiber members that are partially laid along the top surface of a board and are bent at nearly right angle to the board together with an optical component connected to the optical fiber members in the housing space through the opening. The second housing component is attached to the first housing component and can close the opening of the housing space with the portions of the optical fiber members and the optical component connected to the optical fiber members housed in the first housing component.

Abstract: A method for fabrication of a multilayered optical waveguide structure which includes at least two substrates, and an optical waveguide layer disposed between the substrates and having at least one core region and side cladding regions laterally succeeding from the core region. The method is characterized in that the optical waveguide layer is formed from a polysilane compound containing polysilane, and it comprises stacking a first block including one of the substrates and a second block including the other of the substrates through the optical waveguide layer or a cladding layer located at a surface of either one of the blocks, and heating them while pressed in such arrangement so that the first block and the second block are bonded together by the optical waveguide layer or the cladding layer serving as a bonding layer into the multilayered structure.

Abstract: A photoelectric composite connector comprises a first connector unit which is connected to optical transmission means and a second connector unit which can be attached to and detached from a first connector unit freely. The first connector unit comprises a photoelectric conversion module and an electrical connector section having a first conductor which is electrically connected to the photoelectric conversion module. The second connector unit is formed as an electrical connector unit corresponding to the electrical connector section of the first connector unit and having a second conductor. The first conductor of the electrical connector section of the first connector unit and the second conductor of the second connector unit are electrically connected to each other when the electrical connector section of the first connector unit and the second connector unit are connected to each other by use of their electrical connector structures.

Abstract: An optical backplane includes an optical connector which receives juxtaposed optical signals transmitted in nonparallel to the main surface of a circuit substrate from the circuit substrate or transmits juxtaposed optical signals in nonparallel to the main surface of the circuit substrate to the circuit substrate. The optical connector disposes and accommodates edge portions of a plurality of optical fibers and the disposing direction of the optical fibers in the optical connector is in nonparallel to the main surface of the circuit substrate.

Abstract: An optical fiber sheet comprises optical fibers sandwiched between sheet members and fixed thereto. Distal ends of the optical fibers extend from outer peripheral edges of the sheet members with resin coatings applied to the distal ends to produce extensions. The distal ends of the extensions are inserted into fiber holes of connectors with the resin coatings applied to the distal ends to be connected with the connectors.

Abstract: A board-mounted optical connector is provided which enables high-density wiring of optical fibers on a board. The board-mounted optical connector is a board-mounted optical connector having a housing comprising: a first housing component, and a second housing component. The first housing component has a housing space accessible through an opening formed in at least a portion of a side wall and houses portions of optical fiber members that are partially laid along the top surface of a board and are bent at nearly right angle to the board together with an optical component connected to the optical fiber members in the housing space through the opening. The second housing component is attached to the first housing component and can close the opening of the housing space with the portions of the optical fiber members and the optical component connected to the optical fiber members housed in the first housing component.

Abstract: A clock signal of a master clock of a sender is transmitted to a receiver through a classical channel and is returned from the receiver. The clock signal is transmitted with strong light from a sender-side quantum unit to a receiver-side quantum unit through a quantum channel. A sender-side synchronization section establishes phase synchronization between the clock signal returned from the receiver and the clock signal detected by the sender-side quantum unit, and generates a calibration clock signal. At the receiver as well, a receiver-side synchronization section establishes phase synchronization between the clock signal detected from the classical channel and the clock signal detected by the receiver-side quantum unit, and generates a calibration clock signal.

Abstract: A sender's encrypted communication apparatus and a recipient's encrypted communication apparatus autonomously generate keys for encryption with respective key generators, store the generated encryption keys in respective encryption key memories, and store part of the generated encryption keys in respective authentication memories. The keys stored in the authentication memories are used for mutual authentication when the sender's encrypted communication apparatus and a recipient's encrypted communication apparatus are connected to each other.

Abstract: A non-destructive taste characteristics measuring apparatus comprising trays and a measuring section provided in the course of a transport path and at which light is made incident on a vegetable or fruit to measure its taste characteristics, wherein the trays are each provided with at least two tray-side light passages one opening ends of which are so made as to come in contact with the vegetable or fruit and the other ends of which stand open outward at the bottom of the tray, and the measuring section has at least two measurement-side light passages one opening ends of which are positionally adjustable to the opening ends of the tray-side light passages at its part facing the bottom of said tray, and is provided with i) a means for making light incident on the vegetable or fruit through one of the measurement-side light passages and one of the tray-side light passages and ii) a detector which the light emergent from the vegetable or fruit enters through the other tray-side light passage and the other measur

Abstract: A non-destructive taste characteristics measuring apparatus comprising trays and a measuring section provided in the course of a transport path and at which light is made incident on a vegetable or fruit to measure its taste characteristics, wherein the trays are each provided with at least two tray-side light passages one opening ends of which are so made as to come in contact with the vegetable or fruit and the other ends of which stand open outward at the bottom of the tray, and the measuring section has at least two measurement-side light passages one opening ends of which are positionally adjustable to the opening ends of the tray-side light passages at its part facing the bottom of said tray, and is provided with i) a means for making light incident on the vegetable or fruit through one of the measurement-side light passages and one of the tray-side light passages and ii) a detector which the light emergent from the vegetable or fruit enters through the other tray-side light passage and the other measur

Abstract: In an optical self-muting network, N optical splitters are associated respectively, with N inlet terminals for splitting an optical signal from the associated inlet terminal into M replicas of the optical signal. M optical combiners, associated respectively with M outlet terminals, combines N optical signals incident thereon into a combined optical signal and couples it to the associated outlet terminal. M sets of N optical gates are connected between the N optical splitters and the M optical combiners. Each optical gate allows passage of an optical signal incident thereon when it timely coincides with an electrical signal applied thereto. A controller supplies a gate control electrical signal to the optical gates of each set during M successive intervals. Contention between optical packets simultaneously incident on the optical gates of the same set is resolved by the controller.

Abstract: An optical switch circuit is configured as a matrix array to arbitrarily switch the connections between optical transmission channels. The optical switch circit comprises a plurality of optical splitter coupled to input transmission channels, a plurality of optical switches arranged on the matrix crosspoints, each switch comprising an optoelectronic element and a light modulating element functioning as an electrooptic element, and a plurality of optical combiners coupled to output transmission channels. Thus, a small-sized optical switch circuit suitable for integration is realized. With this circuit, small crosstalk and high speed switching without distortion of broadband signals are expected. Further, this circuit provides a wide adaptability such that light transmitted through multi-mode optical fiber can be switched.

Abstract: A plurality of independent cells having a regular octagonal or circular cross section are arranged in the form of a lattice. Cross-sectionally square independent cells are substituted for two octagonal or circular cells in the central portion of the lattice arrangement. These two square independent cells are so formed that each side of the cells has the largest possible length when the cells are placed among the adjacent cells having a regular octagonal or circular cross section. Spacer support rods serving also as water rods are inserted into the square cells in such a fuel spacer, which consists of a combination of cells having a regular octagonal or circular cross section and cells having a square cross section as mentioned above, to form a fuel assembly.