Patent application number | Description | Published |
20130208348 | PLC-TYPE DELAY DEMODULATION CIRCUIT - A PLC-type delay demodulation circuit includes a planar lightwave circuit that is provided on one PLC chip and demodulates a DQPSK signal. The planar lightwave circuit includes a Y-branch waveguide that branches a DQPSK-modulated optical signal into two optical signals and first and second MZIs that delay the branched optical signals by one bit. The length of a short arm waveguide of the first MZI is different from the length of a short arm waveguide of the second MZI, and the length of an optical path from the Y-branch waveguide to output ports of the first MZI through the short arm waveguide of the first MZI is equal to that of an optical path from the Y-branch waveguide to output ports of the second MZI through the short arm waveguide of the second MZI. | 08-15-2013 |
20130209106 | OPTICAL TRANSMISSION SYSTEM, MULTI-CORE OPTICAL FIBER, AND METHOD OF MANUFACTURING MULTI-CORE OPTICAL FIBER - An optical transmission system includes: a multi-core optical fiber having a plurality of core portions. Signal light beams having wavelengths different from each other are caused to be input to adjacent core portions of the plurality of core portions. The adjacent core portions are the most adjacent to each other in the multi-core optical fiber. | 08-15-2013 |
20130209111 | DEMODULATING DELAY CIRCUIT AND OPTICAL RECEIVER - A demodulating delay circuit with a planar lightwave circuit includes: an optical interferometer including input and output couplers, and a first arm waveguide connecting the couplers, and a shorter second arm waveguide. The interferometer delays each bit of a signal by one bit such that the delayed bit interferes with its adjacent bit, and has a bent form such that propagation directions of light in the couplers are different by 180 degrees. The couplers each include first and second waveguides. The first waveguide is longer and the waveguides are closely arranged in parallel at two positions thereby forming directional couplers. The input and output couplers are each configured as a wavelength insensitive coupler having a coupling ratio of 50 percent in a bandwidth used. The first waveguide of the input coupler is arranged on the same side as that on which the first waveguide of the output coupler is arranged. | 08-15-2013 |
20130213709 | CONNECTING STRUCTURE, CONNECTING DEVICE AND CONNECTING METHOD FOR ELECTRIC WIRE AND TERMINAL, AND WIRE HARNESS - A connecting structure is applied for connecting an electric wire and a terminal. For coating a connecting portion of a conductor of the electric wire and the terminal, which form a wire harness, with a coating resin, a portion of an insulator, which is to be inserted into a terminal insertion hole of a connector housing, is subjected to a diameter reduction process such that an outer diameter of the coating resin coated on the insulator is smaller than the terminal insertion hole. | 08-22-2013 |
20130215922 | ELECTRONIC DEVICE, SURFACE EMITTING LASER, SURFACE EMITTING LASER ARRAY, LIGHT SOURCE, OPTICAL MODULE - An electronic device comprising a multilayer semiconductor structure formed by a periodic structure having a first semiconductor layer and a second semiconductor layer, wherein in at least a portion of the multilayer semiconductor structure, the first semiconductor layer and the second semiconductor layer have different conduction types. The first semiconductor layer and the second semiconductor layer have different refractive indexes, and the multilayer semiconductor structure functions as a multilayer reflective mirror. As a result, an electronic device, a surface emitting laser, a surface emitting laser array, a light source, and an optical module with decreased parasitic capacitance can be realized. | 08-22-2013 |
20130220679 | COPPER FOIL AND MANUFACTURING METHOD THEREFOR, COPPER FOIL WITH CARRIER AND MANUFACTURING METHOD THEREFOR, PRINTED CIRCUIT BOARD, AND MULTILAYER PRINTED CIRCUIT BOARD - Provided is a copper foil with a carrier capable of realizing wiring at line/space=15 μm/15 μm or less on a printed circuit board on which the copper foil is laminated. Further provided is a printed circuit board or a multilayer printed circuit board capable of realizing fine-pattern wiring at line/space=15 μm/15 μm or less using the copper foil. The copper foil is obtained by forming a release layer and a copper foil in this order on a carrier foil having a surface on which a mean spacing Sm as defined in JIS-B-06012-1994 between irregularities of ridges is 25 μm or more, and peeling off the copper foil from the carrier foil. The copper foil with a carrier is obtained by forming a release layer and a copper foil in this order on a carrier foil that is said copper foil, wherein a spacing between irregularities of ridges on a surface of the carrier foil on which the copper foil is formed is 25 μm or more in a mean spacing Sm as defined in JIS-B-06012-1994. A roughening treatment layer as necessary and a surface treatment layer are formed in this order on a surface of the copper foil. | 08-29-2013 |
20130266281 | COLORED COATED OPTICAL FIBER - The present invention provides a colored coated optical fiber which hardly has an increase in transmission loss even when immersed in water. A colored coated optical fiber according to one embodiment of the present invention includes a glass optical fiber, a primary coating layer covering the glass optical fiber, a secondary coating layer covering the primary coating layer, and a colored layer covering the secondary coating layer. A ratio of a thermal expansion coefficient of a laminate including the secondary coating layer and the colored layer covering the secondary coating layer to that of the secondary coating layer is 0.98 or more and 1.03 or less. A ratio of a glass transition temperature based on a dynamic viscoelasticity within a temperature range from −100° C. to 150° C. of the laminate to that of the secondary coating layer is 0.96 or more and 1.03 or less. | 10-10-2013 |
20130286468 | RAMAN AMPLIFIER, OPTICAL REPEATER, AND RAMAN AMPLIFICATION METHOD - A Raman amplifier using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, to output pumping lights having different central wavelengths, an interval between adjacent central wavelengths greater than 6 nm and smaller than 35 nm. An optical repeater is adapted to compensate loss in an optical fibre transmission line by the Raman amplifier. A Raman amplification method wherein the shorter the central wavelength of the pumping light, the higher light power of the pumping light. In the Raman amplifier, a certain pumping 1 wavelength being a first channel, and second to n-th channels are arranged with an interval of about 1 THz toward a longer wavelength side, pumping lights having wavelengths corresponding to the first to n-th channels are multiplexed, and pumping light having a wavelength spaced apart from the n-th channel by 2 THz or more toward the longer wavelength side is combined with the multiplexed light, thereby forming the pumping light source. | 10-31-2013 |
20130316238 | NANOSIZED PARTICLES USED IN ANODE FOR LITHIUM ION SECONDARY BATTERIES, AND METHOD FOR PRODUCING THE SAME - A nanosized particle has a first phase that is a simple substance or a solid solution of element A, which is Si, Sn, Al, Pb, Sb, Bi, Ge, In or Zn, and a second phase that is a compound of element D, which is Fe, Co, Ni, Ca, Sc, Ti, V, Cr, Mn, Sr, Y, Zr, Nb, Mo, Ru, Rh, Ba, lanthanoid elements (not including Ce and Pm), Hf, Ta, W or Ir, and element A, or a compound of element A and element M, which is Cu, Ag, or Au. The first phase and second phase are bound via an interface, and are exposed to the outer surface. The surface of the first phase other than the interface is approximately spherical. Furthermore, a lithium ion secondary battery includes the nanosized particle as an anode active material. | 11-28-2013 |
20130324415 | OXIDE SUPERCONDUCTING THIN FILM - The invention provides an oxide superconducting thin film, including: a base material; a superconducting layer containing a plurality of RE-based superconductor units including a rare earth element, CuO chains, and CuO | 12-05-2013 |
20140116151 | OPTICAL FIBERS - An optical fiber, which is less likely to increase its transmission loss even when it is exposed to a high-humidity environment or immersed in water, is provided. The optical fiber comprises a glass fiber and at least two coating layers (a soft layer and a hard layer) coated at the circumference of the glass fiber, wherein the limit-adhesion strength between the glass fiber and the coating layer under a hot and humid environment is 0.5N/10 nm or more. Preferably, the glass-transition temperature of the hard layer is less than 90° C. | 05-01-2014 |