Abstract: An optical branching/coupling device includes a single first port that has an optical fiber; a plurality of second ports each having an optical fiber and arranged at the periphery of the optical axis of the first port, in locations that are removed from the first port in an optical axis direction; a core layer that transmits light between the first port and the second ports; and a cladding layer that covers the periphery of the core layer, wherein the core includes a plurality of optical waveguides, one end side of the optical waveguides being connected to each core of the plurality of second ports, and another end side of the optical waveguides joining together and being connected to a core of the first port, and the optical waveguides are a cured product of a photocuring resin.

Abstract: Provided is an optical branching/coupling device in which optical transmission quality is improved by preventing a reduction in optical transmission quality, the reduction being due, for example, to an optical waveguide core affecting a light of another optical waveguide core in the vicinity of a joining section of the two optical waveguide cores. This optical branching/coupling device includes: a first optical waveguide that is provided extending from one end side to other end side; a second optical waveguide that is provided extending on a separate route from the one end side to the other end side, the other end side of the second optical waveguide being joined to the other end side of the first optical waveguide; and a cladding layer that covers the periphery of the first optical waveguide and the second optical waveguide, wherein the first and second optical waveguides comprise a cured product of a photocuring resin.

Abstract: Provided is an optical branching/coupling device in which optical transmission quality is improved by preventing a reduction in optical transmission quality, the reduction being due, for example, to an optical waveguide core affecting a light of another optical waveguide core in the vicinity of a joining section of the two optical waveguide cores. This optical branching/coupling device includes: a first optical waveguide that is provided extending from one end side to other end side; a second optical waveguide that is provided extending on a separate route from the one end side to the other end side, the other end side of the second optical waveguide being joined to the other end side of the first optical waveguide; and a cladding layer that covers the periphery of the first optical waveguide and the second optical waveguide, wherein the first and second optical waveguides comprise a cured product of a photocuring resin.

Abstract: An electronic device has: a connector having plural kinds of terminals with respectively different cross section shapes; and a substrate having a plurality of through-holes with lands formed therein. In the electronic device, a width W1 of an insertion portion of the first terminal, a width W2 of an insertion portion of the second terminal, a land-inclusive hole diameter D1 of the first through-hole, and a land-inclusive hole diameter D2 of the second through-hole are configured to fulfill conditions of W1<W2, D1<D2, and W2?W1>D2?D1, for the improvement of connection reliability between the land and the terminal while restraining dropping of reflow solder in a connector mounting process.

Abstract: An electronic device has: a connector having plural kinds of terminals with respectively different cross section shapes; and a substrate having a plurality of through-holes with lands formed therein. In the electronic device, a width W1 of an insertion portion of the first terminal, a width W2 of an insertion portion of the second terminal, a land-inclusive hole diameter D1 of the first through-hole, and a land-inclusive hole diameter D2 of the second through-hole are configured to fulfill conditions of W1<W2, D1<D2, and W2?W1>D2?D1, for the improvement of connection reliability between the land and the terminal while restraining dropping of reflow solder in a connector mounting process.

Abstract: To create a network that connects a plurality of wireless communication systems to create optimal systems for various environments, and that seamlessly integrates the resulting systems together in order to provide more efficient and advanced service in general. A network system that can seamlessly integrate wireless communication systems employs a heterogeneous network architecture with at least four building blocks, including a mobile host 40, a wireless access network 41, a common core network 42, and an external network 43.

Abstract: To create a network that connects a plurality of wireless communication systems to create optimal systems for various environments, and that seamlessly integrates the resulting systems together in order to provide more efficient and advanced service in general. A network system that can seamlessly integrate wireless communication systems employs a heterogeneous network architecture with at least four building blocks, including a mobile host 40, a wireless access network 41, a common core network 42, and an external network 43.

Abstract: To create a network that connects a plurality of radio systems to create optimal systems for various environments, and that seamlessly integrates the resulting systems together in order to provide more efficient and advanced service in general. A basic access network 11 enables communication 13 between a basic access component provided in a mobile host 10 and widely disposed basic access network base stations, and comprises a basic access network channel implemented with a two-way radio interface and a basic access network protocol also used by a common core network of the network system.

Abstract: To create a network that can seamlessly integrate a plurality of wireless communication systems to provide more efficient and advanced service and, in particular, to provide a common platform for various radio communication networks A common core network has a mobility manger 47 that supports roaming mobile hosts and a resource manager 46 that coordinates traffic distribution. The common core network allows roaming within a homogeneous radio communication network and between heterogeneous radio communication networks while ensuring service quality. In one area, the common core network enables Internet 33 access via a gateway router 32. A plurality of common core network structures (31, 31′), each of which is the same as that residing in one area, are each arranged in corresponding areas via the Internet.

Abstract: The present invention is directed to a TDMA communication system which is adapted to different communication environments or prepares different communication environments and allows each mobile station to be set for working in any one of the different communication environments. The communication system commonly uses a TDMA format that has a fixed frame-length and a constant number of bits for each of the slots composing the frame. The communication environments have prepared respective sets of communication conditions, each set including a transmission power, a modulating method, the number of multiplexed signals, error-correction, an antenna gain, a frequency hopping value and a diversity value. At each mobile station and each base station, one of plural sets of communication conditions for respective environments is selected to establish communication with each other under the selected environment.