Nippon Telegraph and Telephone Corporation

Ntt Advanced Technology Corporation

Ntt Electronics Corporation

Senko Advanced Components, Inc.

Etsu Hashimoto

Yoshitada Katagiri

Koichi Hadama

Kenichi Suzuki

Yuzo Ishii

Mitsuo Usui

Kentaro Uchiyama

Joji Yamaguchi

Tohru Matsuura

Kenta Arai

Shuichiro Asakawa

Yoshio Suzuki

Toru Miura

Norio Sato

Kenya Suzuki

Hidehiko Takara

Yosuke Takeuchi

Nobuaki Matsuura

Keita Yamaguchi

Wataru Imajuku

Mitsumasa Nakajima

Toshiki Nishizawa

Yuichi Higuchi

Kazunori Seno

Fusao Shimokawa

Tomoyoshi Kataoka

Yuji Mitsuhashi

Mitsunori Fukutoku

Shingo Uchiyama

Johji Yamaguchi

Eiichi Yamada

Naru Nemoto

Toshio Morioka

Yoshito Jin

Terumasa Kamouchi

Yoshiaki Haga

Tetsuo Abe

Kazutoshi Ando

Yohei Omodaka

Akio Sahara

Toshifumi Konishi

An optical connector cleaning tool includes a cleaning tool main body, a feed-side bobbin, a cleaning head (cleaning portion), a winding-side bobbin, a moving body that moves at the time of cleaning, a feed mechanism that sends an unused cleaning medium in synchronism with the moving body, and a winding mechanism that drives the winding-side bobbin. The feed mechanism moves a turn-back portion at one point where the cleaning medium is turned back in a direction to separate from the winding-side bobbin. The winding mechanism includes a driving piece that engages with a rotation body of the winding-side bobbin. The driving piece slips with respect to the rotation body when a load to press engaging projections of the rotation body has reached a predetermined load.

Optical connector cleaning tool

An optical connector cleaning tool includes a cleaning portion pressed against a coupling end face of an optical connector, a container storing a cleaning liquid, and an atomizer spraying the cleaning liquid to the cleaning portion.

An optical connector cleaning tool includes a fitting portion () fitted in the first or second hole () of a connection component () into which a compact dual core optical connector is fitted on one end side and a cleaning medium () projecting from the fitting portion (). The fitting portion () is formed to have a shape by which the fitting portion () is fitted in the first or second hole () in each of the first and second postures as postures shifted through 180° with respect to as the center the middle (P) of a virtual straight line connecting the centers of the two ferrules when viewed from an axial direction of the compact dual core optical connector. The fitting portion () contacts one ferrule in a state in which the fitting portion () is set in the first posture. The fitting portion () contacts the other ferrule in a state in which the fitting portion () is set in the second posture. There can be provided an optical connector cleaning tool by which the connection end faces of the compact dual core optical connector having two ferrules in one housing can be cleaned.

Optical connector cleaning tool and optical connector cleaning tool attachment

An optical connector cleaning tool includes a cleaning portion (), a container () configured to store a cleaning liquid (), and an atomizer () configured to atomize the cleaning liquid () stored in the container () by ultrasonic atomization. The atomizer () includes an atomizing separation portion () configured to cover a liquid supply port () and pass not a liquid but mist. In addition, the cleaning tool includes a control circuit () configured to control an operation time of the atomizer () by a set time.

An end face observation device () of this invention includes a first lens () including a missing portion () extending through in an optical axis direction, a light source () configured to generate light that irradiates an end face (A) of an observation target via the first lens, and an image capturing element () configured to receive an image of the end face of the observation target via the first lens. This can implement an end face observation device that integrates a structure configured to operate the end face of the observation target with an observation device configured to observe the end face by inserting the structure configured to operate the end face of the observation target into the missing portion of the first lens.

End face observation device

An optical input/output device includes a phase modulator element and an optical element. The phase modulator element includes a plurality of pixels arranged in a matrix and is configured to change an optical phase of signal light by applying a driving signal corresponding to a phase pattern. The optical element is configured to convert a direction of exit of the signal light so as to irradiate each pixel with the signal light from the input port. A pattern generator unit includes superimposing means for superimposing a periodic phase pattern having a predetermined period in at least one direction in a plane of the phase modulator element, and means for controlling an amplitude of the periodic phase pattern. The signal light is diffracted to a position according to the period of the superimposed periodic phase pattern, so that light intensity of the signal light is dispersed.

Optical input/output device

A wavelength selection switch system includes a wavelength selection switch including an input port and an output port, a nonvolatile memory in which configuration information for controlling an operation of the wavelength selection switch is stored, a high-speed memory in which reading and writing can be performed at a higher speed than in the nonvolatile memory and that stores a copy of the configuration information stored in the nonvolatile memory, and a control unit that controls an operation of the wavelength selection switch based on the configuration information read from the high-speed memory, wherein the control unit periodically reads the configuration information stored in the nonvolatile memory and writes a copy of the read configuration information to the high-speed memory.

Wavelength selection switch system and method for controlling wavelength selection switch

A light-shielding portion () shields the light spot of output light output toward a shunt position &#x3b1; by a projecting portion (). Hence, the output light output toward the shunt position &#x3b1; does not travel to an output port (). This allows to prevent crosstalk.

Optical switch

A movable beam () and a movable beam () each having one end fixed to a frame portion () of a mirror substrate () are provided inside the frame portion (). The movable beam () and the movable beam () each having one end fixed to a corresponding to one of two opposite inner sides of the frame portion () are aligned at a predetermined distance on the same line in the direction in which the two sides face each other. Each of the movable beam () and the movable beam () has the other end displaceable in the normal line direction of the mirror substrate () and therefore has a cantilever structure. A mirror () is arranged between the movable beam () and the movable beam () and connected to them via a pair of connectors ().

Micromirror device and micromirror array

Extremely advanced technology for scrambling an optical signal based on quantum mechanical fluctuation is used to provide a highly reliable optical communication method which can invalidate illicit activities such as wire-tapping, a system, and a laser oscillator which is used in the method and system. A transmitter side generates laser light, simultaneously oscillated at a plurality of wavelengths, the total number of generated photons being constant, and transmits a signal light comprising data which has been added to the light of the plurality of wavelengths; and at a receiving side, light, simultaneously oscillated at the plurality of wavelengths, is selected from the signal light, and the data is demodulated.

Laser oscillator, optical communication method and system

In an ultrahigh-speed clock extraction circuit wherein a local pulse generating light sourcefor generating a local optical pulse stream synchronized in bit phase with an input optical signal pulse stream is placed in a phase-locked loop, when repetition frequencies of the input optical signal pulse stream and the local optical pulse stream bear a particular relationship, a frequency demultiplierand multipliersandare set so that the frequency of a modulation signal for an optical modulatorand a frequency which is a natural-number multiple of the modulation signal frequency, and the frequency of a down-converted version of an optical pulse stream output from a photodetectordiffer from each other.

Ultrahigh-speed clock extraction circuit

A temperature meter for measuring temperature of a measurement target object to which a temperature sensor cannot be fixed directly is formed by a temperature sensor configured to measure an observed temperature in a vicinity of the measurement target object; a timer configured to measure a temperature observation time; and a calculation processor configured to calculate the temperature of the measurement target object according to the observed temperature and the temperature observation time by carrying out a prescribed calculation processing.

Method and apparatus for measuring temperature of movable object

A phase-lock loop is formed by a voltage-controlled oscillator, a local optical pulse source, an optical branching device for branching the locally generated optical pulse stream from the local optical pulse source, a harmonic component local generation part for locally generating a harmonic component electrical signal from the one of two branched locally generated optical pulse streams, and a phase comparison part for comparing the phases of the locally generated harmonic component electrical signal and an incoming signal component electrical signal generated from an incoming optical signal pulse stream and for supplying the voltage-controlled oscillator with a control voltage corresponding to the phase difference between the two input electrical signals. The other branched output from the optical branching device is output as a locally generated optical pulse stream bit-phase synchronized with the incoming optical signal pulse stream.

Bit-phase synchronized optical pulse stream local generator

Growing community of inventors

Tokyo, Japan

Etsu Hashimoto