Mitsubishi Denki Kabushiki Kaisha

Sony Corporation

Mitsubishi Electric Corporation

Other

Independent Administrative Institution, Japan Agency for Marine-earth Science and Technology

Kddi Submarine Cable Systems Inc.

Katsuhiro Shimizu

Takashi Mizuochi

Toshihide Hayashi

Ban Kawamura

Koki Tsumori

Masayuki Tsumura

Tadayoshi Kitayama

Kazuyuki Ishida

Kuniaki Motoshima

Kiwami Matsushita

Yukio Kobayashi

Satoshi Kajiya

Masatoshi Suzuki

Junichi Nakagawa

Shu Yamamoto

Hidenori Taga

Takashi Sugihara

Naoki Suzuki

Toshiyuki Tokura

Tatsuya Kobayashi

Hideo Yoshida

Noboru Edagawa

Itsuro Morita

Aritomo Uemura

Takahiko Itoh

Eiichi Nakagawa

Kenkichi Shimomura

Shunji Umemura

Takeshi Komiya

Nobuyuki Takemura

Yasuo Inoue

Junichi Abe

Tsuyoshi Yoshida

Kazuo Kubo

Ichiro Sato

Koji Goto

Shinichi Nakagawa

Yoshikuni Miyata

Naoki Fujisawa

Kiyoshi Onohara

Hachiro Fujita

Katsuyoshi Kawaguchi

Shunsuke Mitani

Shigeo Yamanaka

Eiichi Shibano

Tadami Yasuda

Ryuichi Okumura

Hiroki Shima

Kazushige Sawada

Hitoshi Mikada

Kenichiro Kawanami

Kazuhide Ouchi

Tasuku Fujieda

Jun'ichi Abe

Ken'ichi Asakawa

Jun′ichi Abe

An AV system composed of an HD recorder and a display unit uses a communication interface of the HDMI. An HDMI source of the HD recorder transmits image data (image signal) in the form of differential signals to an HDMI sink of the display unit through three TMDS channels. The HDMI source inserts content identification information for the identification of the type of a content of image data to be transmitted into an AVI InfoFrame packet placed in a blanking period. A control section of the display unit controls operation of a display processing section which carries out a process for displaying for the image data based on the content identification information received by the HDMI sink and a display section for displaying an image.

Communication system, transmission apparatus, transmission method, reception apparatus and reception method

[Object] To make it possible for the reception side to carry out an optimum process for an image signal (image data) depending upon the type of a content. [Solving Means] An AV systemcomposed of an HD recorderand a display unituses a communication interface of the HDMI. An HDMI sourceof the HD recordertransmits image data (image signal) in the form of differential signals to an HDMI sinkof the display unitthrough three TMDS channels. The HDMI sourceinserts content identification information for the identification of the type of a content of image data to be transmitted into an AVI InfoFrame packet placed in a blanking period. A control sectionof the display unitcontrols operation of a display processing sectionwhich carries out a process for displaying for the image data based on the content identification information (ITC, CTand CT) received by the HDMI sinkand a display sectionfor displaying an image.

A repeater includes a variable optical attenuating unit that collectively attenuates WDM optical signal input, an optical-attenuation adjusting unit that adjusts attenuation in the variable optical attenuating unit, and an optical amplifying unit that collectively amplifies and outputs the WDM optical signal collectively attenuated, to a downstream side. An optical-attenuation adjusting unit includes an input level detector; an output level detector; an output-level transmitting unit that receives information of a signal level of WDM optical signal output by a repeater at an upstream side and transmits information of a signal level of the WDM optical signal detected by the output level detector to a repeater at a downstream side; and an attenuation amount controller that controls the variable optical attenuating unit by calculating an attenuation amount thereof based on information of a signal level detected by the input level detector and a signal level received by the output-level transmitting unit.

Optical transmission system and repeater

A control-target-value setting unit sets a control target value corresponding to the number of multiplexed wavelengths measured by a number-of-multiplexed-wavelengths measuring unit. A controller controls the variable optical attenuator based on the control target value. An optical amplifier performs an optical amplification with a constant gain regardless of power of a wavelength-multiplexed light. The controller performs feedback control of the variable optical attenuator such that a result of measurement of the total power of the wavelength-multiplexed light coincides with the control target value.

Optical relay device and optical relay transmission system

There is provided a display device equipped with a display unit, the display device including a receiving part for receiving a difference signal of a plurality of channels including an image signal and content identification information inserted in a blanking period and outputting the image signal and the content identification information; a light emission amount regulation part for setting a reference duty according to image information of the image signal; an adjustment part for adjusting so that an actual duty is within a predetermined range based on the reference duty and an adjustment signal and adjusting a gain of the image signal so that a light emission amount defined by the actual duty and the gain of the image signal becomes the same as the light emission amount defined by the reference duty; and an adjustment signal generation part for generating the adjustment signal based on the content identification information.

Display device, image signal processing method, and program

An optical reception device realizes stabilization of reception sensitivity inexpensively and highly precisely. The optical reception device includes: a Mach-Zehnder type 1-bit delay unit including a one-terminal input port and two-terminal output ports for decoding an optical difference phase shift keying (DPSK) signal and provided with one or more phase control functions to control the phase state of light; photoelectric conversion means for branching a portion of an optical output signal output from the one-side output port of the Mach-Zehnder type 1-bit delay unit, to convert the branched portion into an electric signal; and a phase control unit for controlling the phase state of the Mach-Zehnder type 1-bit delay device by using as an error signal the output signal of the photoelectric conversion means.

Optical reception device

An optical divider divides an optical input signal into a plurality of paths. A plurality of optical-to-electrical converters respectively converts the divided optical input signals into electrical signals. A plurality of discriminators respectively outputs discrimination results by discriminating the electrical signals output from the optical-to-electrical converters based on predetermined thresholds. An operational circuit performs a predetermined logical operation with the discrimination results output from the discriminators.

Optical receiver

An error correction coding apparatus includes a first coding unit for coding a sequence data to be coded which includes information source data for each frame to generate an error correcting code word sequence including a parity sequences, and a first rearranging unit for rearranging elements of the error correcting code word sequences of a plurality of frames generated by the first coding unit. The first rearranging unit rearranges elements of the parity sequences included in the error correcting code word sequences. The first rearranging unit also rearranges elements of the error correcting code word sequences other than the parity sequences, within the error correcting code word sequences other than the parity sequences.

Apparatuses and method for error correction coding and error correction decoding

An optical transmitter includes an optical modulator, an optical coupler, a crosspoint monitoring unit, a reference-value setting unit, and a bias circuit. The optical coupler splits an optical signal output from the optical modulator into a plurality of optical signals. The crosspoint monitoring unit receives part of the optical signals, and monitors a crosspoint of the optical signal output from the optical modulator. The reference-value setting unit sets a bias reference value to be assigned to the optical modulator based on an output of the crosspoint monitoring unit so that the crosspoint is constant. The bias circuit applies a bias to the optical modulator based on the bias reference value.

Optical transmitter and optical communication system

A Raman amplifier includes a pumping light source, an optical coupler, and a Raman amplifier medium. The pumping light source outputs a pumping light that is intensity-modulated with a frequency equal to or higher than 100 megahertz. The optical coupler couples the pumping light with a carrier light. The Raman amplification medium is pumped by the pumping light to amplify the carrier light. The Raman amplification medium has characteristics of a low dispersion and a small difference between propagation times of the carrier light and the pumping light.

Raman amplifier and optical communication system

A bias circuit that supplies bias voltage or bias current to one end of a transmission line includes an inductor that prohibits a high frequency component of a baseband signal transmitted on the transmission line and passes a frequency component near direct current of the baseband signal, and an impedance-decrease prevention element that prevents impedance from decreasing, when viewed from the transmission line, that is produced due to a resonance between a parasitic capacitance generated due to the inductor and an inductance of the inductor.

Bias circuit

Growing community of inventors

Tokyo, Japan

Katsuhiro Shimizu