Matsushita Electric Industrial Co., Ltd.

Hiroyuki Asakura

Masanori Iida

Mikihiro Shimada

Tsuguhiro Korenaga

Hisashi Adachi

Masaki Kobayashi

Yasuhiro Tanaka

Yoshitomi Nagaoka

Ryuichiro Kuga

Yoshiaki Hirao

Tetsuji Miwa

Hideo Kurokawa

Kaoru Ishida

Michihiro Yamagata

Shusuke Ono

Makoto Umetani

Tomohiko Sasano

Minoru Nishioka

Hiromichi Tanaka

Hikaru Ikeda

Naoki Takenaka

Kiyokazu Hagiwara

Eiji Tanaka

Yoshiteru Matsuda

Koichi Murase

Tetuji Miwa

Shinji Hataji

A first substrate on which an optical-waveguide groove is formed and a second substrate. The second substrate is bonded to the plane of the first substrate on which the optical-waveguide groove is formed by a material having a refractive index higher than those of the first substrate and second substrate. The optical-waveguide groove is filled with the material, and the refractive index of the first substrate is different from the refractive index of the second substrate.

Optical waveguide and method of forming the same

An optical lens, has a marking entirely or partially outside an effective area of the lens to distinguish between surfaces of the lens.

Optical lens with marking and manufacturing method thereof

Transmitting circuit apparatus and method

A micro-shape transcription method has preparing a mold having a transcription face on which a concavo-convex pattern is formed, pressing the transcription face against a base material softened by heating, then forcibly separating the mold from the base material to transcribe a reverse pattern of the concavo-convex pattern to the surface of the base material, wherein when assuming a temperature for pressing the mold against the base material as T(&#xb0; C.), a temperature for separating the mold from the base material as T(&#xb0; C.), thermal expansion coefficients of the mold and the base material as &#x3b1;and &#x3b1;, and the maximum distance between the transcription center of the transcription face and the concavo-convex pattern as d (mm), the following relations (1) and (2):T&#x2267;T&#x2003;&#x2003;(1)|&#x3b1;&#x2212;&#x3b1;|&#xb7;()&#xb7;&#x2266;4&#xd7;10&#x2003;&#x2003;(2)are simultaneously satisfied.

Micro-shape transcription method, micro-shape transcription apparatus, and optical-component manufacture method

A transmitting circuit apparatus has a first digital modulator and a second digital modulator for modulating an I signal and a Q signal which are multi-valued digital baseband modulation signals, into a digital I signal and a digital Q signal, respectively, having the number of bits smaller than that of the baseband modulation signals; and a quadrature modulator for outputting a signal synthesized from the signals generated by modulating (two) carrier waves each having a phase perpendicular to each other by using the modulated I and Q signals, respectively.

Wireless quadrature modulator transmitter using E/O and O/E connectives

An optical mount substrate and a manufacturing method of the optical mount substrate. An optical fiber guide section for arranging and fixing an optical transfer section, having an optical waveguide or an optical fiber, is formed. An electrical conductivity member is embedded in the optical mount substrate so that it penetrates a first principal plane of an arrangement section for arranging an optical device optically connected with the optical waveguide or the optical fiber on the first principal plane, and a second principal plane of the arrangement section parallel to the first principal plane. The optical fiber guide section and the arrangement section are formed by pressing a mold member to a heated and softened substrate to transfer inversion geometry of the mold member onto the substrate. The electrical conductivity member, having a predetermined shape, is directly pressed onto the heated and softened substrate to embed it into the substrate.

Optical mount substrate, optical module, optical transmitter-receiver, optical transmitter-receiver system, and manufacturing method of optical mount substrate

A wired transmission path includes first and second differential transmission paths. The first differential transmission path is composed of two strip lines, and the second differential transmission path is composed of two strip lines. Each of the strip lines of the first differential transmission path is disposed at an equal distance from the strip lines of the second differential transmission path. Thus, there is provided a wired transmission path including a plurality of differential transmission paths in such a manner so as to cancel crosstalk.

Wired transmission path with plural equidistant differential conductors

Optical module and manufacturing method thereof

An optical module of the present invention includes a first substrate, a second substrate, a PD, a LD, and an optical fiber. The first substratehas a first optical waveguide coreformed therein. The second substratehas a second optical waveguide coreformed therein. The first optical waveguide coreand the second optical waveguide coreform an optical connecting portion where the first substrateand the second substrateare bonded to each other. The LDis capable of transmitting an optical signal via the second optical waveguide coreand the optical fiber. The PDis capable of receiving an optical signal which enters the second optical waveguide corefrom the optical fiber, and propagates through the first optical waveguide corevia the optical connecting portion formed between the first optical waveguide coreand the second optical waveguide core

Optical waveguide, optical module, and method for producing same module

Optical waveguide, optical module, and method for producing the same module

An optical element has a substrate having or not having a channel for optical waveguide; and a material which has a refractive index higher than that of the substrate and is filled in the channel for optical waveguide or is disposed on the substrate; wherein the refractive index in a part of the material varies substantially periodically or is substantially continuously monotone increasing or decreasing in the direction of light propagation.

Optical element and method of fabrication thereof

The invention provides a radio circuit realizing a desired receiving characteristic even when a strong-level interfering wave is received and operating with small power when no interfering wave is received. The radio circuit comprises a receiving circuit for selecting a signal having a desired frequency from received signals and demodulating the signal, an input-power detector for detecting power P of the receiving circuit, a received-power detector for detecting power P of a signal selected by the receiving circuit, and a reception control circuit for controlling the receiving circuit. The reception control circuit controls the receiving circuit at a low distortion by increasing the power consumption of a circuit included in the receiving circuit and thereby expanding the linear operation range when the power P detected by the input-power detector is larger than a predetermined value t and the power P detected by the input-power detector is smaller than a predetermined value t

Radio circuit and control method of radio circuit

Plural subcarrier-multiplexed AM signals are input and narrow-band-FM-modulated by a voltage controlled oscillator including the fundamental carrier wave and higher-order harmonics as the output, and the FM carrier wave component of the higher-order harmonics of the fundamental carrier wave is selectively taken out by a band-rejection filter shifted to the lower frequency side by a frequency converter converted into an optical signal by an electric/optic converter and transmitted.

Voltage controlled oscillator, FM signal optical transmitter, FM signal optical receiver and FM signal optical transmission system

FM signal converter, FM signal optical transmitter and FM signal optical receiver

An optical waveguide component has a first optical member in which a predetermined first core pattern groove is formed and a second optical member in which a predetermined second core pattern groove is formed, the first and second optical members being combined together so that said first and second core pattern grooves are opposingly overlapped with each other, and the first and second core pattern grooves being filled with a core material.

Growing community of inventors

Osaka, Japan

Hiroyuki Asakura