Sumitomo Electric Industries, Limited

Nippon Telegraph and Telephone Corporation

Fuji Xerox Co., Ltd.

Other

Masayuki Nishimura

Eisuke Sasaoka

Masayuki Shigematsu

Shigeru Tanaka

Toshiaki Okuno

Makoto Katayama

Masashi Onishi

Takatoshi Kato

Takemi Hasegawa

Hitoshi Hatayama

Koji Nakazato

Tomonori Kashiwada

Tomohiko Kanie

Shinji Ishikawa

Kazuhito Saito

Hideo Kobayashi

Masao Tachikura

Toshiaki Katagiri

Tohru Yamanishi

Hiroo Kanamori

Tetsufumi Tsuzaki

Motoki Kakui

Hiroshi Suganuma

Chisai Hirose

Masakazu Shigehara

Takeshi Okoshi

Yoshiyuki Suetsugu

Shigeru Hirai

Yasuji Hattori

Minoru Watanabe

Masayuki Inoue

Takuji Matsumoto

Masaaki Hirano

Daisuke Tanaka

Tomomi Sano

Manabu Shiozaki

Yuichi Ohga

Atsuyuki Kitamura

Yoichi Ishiguro

Masumi Ito

Ikutaroh Nagatsuka

Hidehiko Takara

Yoshifumi Ozaki

Katsuya Nagayama

Nobuhiro Akasaka

Shuzo Suzuki

Masaru Okutsu

Satoki Kawanishi

Shigeki Nishimura

Katsumi Harumoto

Hiromitsu Koizumi

Kei Hirata

Naomasa Okimura

Kaoru Okuno

Satoshi Matsuzaka

Mizuki Sugino

Kunihiko Mori

Toru Iwashima

Yasushi Koyano

Yasunori Murakami

Toshiyuki Miyamoto

Shigeru Tomita

Norio Irie

Kouji Nakazato

Hiromu Ono

Hideo Nagura

Toshio Uchida

Youichi Ishiguro

Yuusaku Hashimoto

Hiroshi Yokoto

Shunichi Tsuchiya

Hiroshi Ishisaki

An image forming apparatus includes an acquiring unit that acquires rendering information including one or both of a text and an illustration; a first image forming unit that forms an image on a sheet material based on the rendering information that has been acquired; and a second image forming unit that forms an electrostatic attraction toner image on the sheet material, the electrostatic attraction toner image being for imparting an electrostatic attraction function to the sheet material, the electrostatic attraction function allowing the sheet material to be attracted to an object surface by using static electricity.

Image forming apparatus and print sheet

Signal wavelengths &#x3bb;, &#x3bb;, &#x3bb;of signal light components multiplexed at signal multiplexing sectionsof multiplexing stationsinstalled on the input end side of an EDFAon an optical transmission lineare set such that the wavelength-dependent noise figure of EDFAsuccessively decreases from the signal wavelength &#x3bb;multiplexed at the signal multiplexing sectionclosest to the input end of EDFAto &#x3bb;and &#x3bb;. On the other hand, the transmission length of individual signal light component before being fed into the EDFAis the shortest in the signal light component at &#x3bb;and successively increases at &#x3bb;and &#x3bb;. Thus, the order of magnitude of input signal light power is the same as the order of highness of noise figure in EDFA, whereby fluctuations in S/N ratio in the resulting amplified light are reduced.

Channel allocation method for multi-channel optical transmission and optical transmission system utilizing the method

In an optical amplifier according to the present invention, a change signal from a change signal source is fed into a light source or a drive circuit. The wavelength of light outputted from the light source is changed based on the change signal. The wavelength-changed output light from the light source is outputted as pumping light from a pumping light generator to be supplied backwardly via an optical multiplexer/demultiplexer into an optical fiber. Signal light is Raman-amplified in the optical fiber with the supply of the pumping light.

Light generator, optical amplifier, and optical communication system

An optical fiber has a section of the first kind having a chromatic dispersion not less than a given positive value x and a negative chromatic dispersion slope at a given wavelength and a section of the second kind has a chromatic dispersion not more than &#x2212;x and a positive chromatic dispersion slope at the same wavelength. Another optical fiber has a chromatic dispersion higher than a positive value x and a negative chromatic dispersion slope at a given wavelength band.

Method of making a microstructured optical fiber

This invention provides an optical transmission system which allows to perform high-quality transmission of each of a plurality of signal channels multiplexed. In the optical transmission system, signal light in which a plurality of signal channels with an optical frequency spacing of 400 GHz or more but 12.5 THz or less is transmitted from an optical transmitter to a Raman amplifier through an optical fiber transmission line. In the Raman amplifier, pumping light from a pumping light source unit is supplied to an optical fiber through an optical coupler. The multiplexed signal light inputted to the Raman amplifier arrives at the optical fiber through an optical isolator and optical coupler, and Raman-amplified by the optical fiber. The Raman-amplified multiplexed signal light is outputted from the Raman amplifier through an optical coupler and optical isolator.

Optical transmission system

An image forming apparatus for forming an image with a developing agent, includes: a collecting-developing-agent occurring part in which the collecting developing agent to be collected in the developing agent occurs; a collection container for accommodating the collecting developing agent; a transporting part provided so as to connect the collection container and the collecting-developing-agent occurring part and for collecting and transporting the collecting developing agent occurring in the collecting-developing-agent occurring part; and a replacement part removably mounted in an apparatus body, wherein the collection container is mounted to be integrated with the replacement part.

Image forming apparatus

The present invention discloses an optical transmission line constructing method comprising the steps of connecting a plurality of optical fibers differing from each other in terms of a transmission characteristic; making inspection light incident on an entrance end of the connected plurality of optical fibers; detecting, on the entrance end side, respective return light components of the inspection light occurring at individual positions of the plurality of optical fibers in its longitudinal direction; evaluating a characteristic information distribution of return light in the longitudinal direction of the plurality of optical fibers; and constructing an optical transmission line according to a result of the evaluation.

Method of constructing an optical transmission line and an optical transmission line

The present invention relates to an optical transmission line enabling Raman amplification of an optical signal when pumping light is supplied thereto, a method of making this optical transmission line, and an optical transmission system using this optical transmission line. This optical transmission line is an optical transmission line enabling Raman amplification of an optical signal when pumping light is supplied thereto, wherein a region yielding the maximum value of Raman gain coefficient is separated from an end portion where the pumping light is supplied by a predetermined distance along a direction in which the pumping light advances. This optical transmission line can restrain the power of optical signal, at any point of the optical transmission line, from increasing to such an extent that optical Kerr effects occurs remarkably and from decreasing to such an extent that the SN ratio deteriorates greatly, and can fully secure the power of optical signal at the end point of the optical transmission line.

Optical transmission line, method of making optical transmission line, and optical transmission system

An optical switch according to this invention has a planar waveguide in which an optical path is formed. A trench is formed in the upper surface of this planar waveguide. A cantilevered movable member is mounted on the planar waveguide. A comb is formed in the end portion of this movable member. A mirror which intercepts light propagating on the optical path is fixed to the end of the movable member. An electrode opposing the movable member is formed on the planar waveguide. A comb is formed in that portion of this electrode, which opposes the comb of the movable member. The movable member and electrode are connected via a voltage source. When this voltage source generates electrostatic force between the movable member and electrode, the movable member bends, and the mirror moves along the bottom surface of the trench accordingly.

Optical switch and optical switch array

A optical filter has a loss spectrum whose gradient dL/d&#x3bb; of a loss L (dB) with respect to the wavelength &#x3bb; (nm) is variable in the wavelength band of multiplexed signal light. A control circuit detects each power of signal light components demultiplexed by an optical coupler and controls the power of optical pumping light to be supplied to an optical amplification section from an optical pumping light sources such that the power of output signal light has a predetermined target value. The control circuit also controls the gradient dL/d&#x3bb; of the optical filter on the basis of powers of the signal light components.

Optical amplifier and optical amplification method

An optical fiber composite that can easily have a desired mean transmission property as a whole even after a length of optical fiber is cut off from one end or both ends, a cable comprising the composites, and methods for producing the composite and cable. An optical fiber compositeis produced by splicing a first optical fiber, a second optical fiber, and a third optical fiberin this order. The first optical fiberand the third optical fibereach have a first chromatic dispersion, D, at the wavelength of a signal-carrying lightwave. The second optical fiberhas a second chromatic dispersion, D, at the wavelength of the signal-carrying lightwave. The third optical fiber has a length, L, shorter than the length, L, of the first optical fiber. It is desirable that the ratio L/Lbe at most 0.1.

Optical fiber composite and optical fiber cable and production method thereof

An optical communication system has a configuration in which an optical transmission line is laid between a repeater (transmitter) and another repeater (receiver). The optical transmission line is formed by fusion-splicing a first optical fiber on the upstream side and a second optical fiber on the downstream side. The first optical fiber has a transmission loss of 0.25 dB or less, and an effective area of 80 &#x3bc;mor above (preferably 100 &#x3bc;mor above), at a wavelength of 1550 nm, which is the wavelength of signal light. The second optical fiber is connected to the downstream end of the first optical fiber and has positive dispersion regions and negative dispersion regions which are alternately arranged along the longitudinal direction and whose chromatic dispersions at a wavelength of 1550 nm are positive and negative, respectively.

Optical transmission line and optical communication system

A small optical device which has low power consumption and which is excellent for integration, and which has a variable optical attenuation function which features proper polarization dependence over the entire wide variable optical attenuation range is provided. In the optical device, an optical circuit including a core and a cladding that covers the core is formed on a substrate. An optical element is movably disposed inside a groove provided in the substrate so as to traverse the core, and includes a plurality of optical attenuation elements having different light attenuation amounts. By moving the optical element by an actuation function portion provided on the optical circuit, the attenuation amount of signal light that propagates through the optical circuit is changed.

Variable optical attenuator

An optical signal, which is to become the subject of dispersion compensation, is split by optical combining/splitting unit, and each frequency component of the optical signal that is split is reflected by the corresponding reflective mirrorincluded in reflective mirror groupto apply a predetermined phase shift to the respective frequency components Each reflected frequency component is then combined using optical combining/splitting unit, to give dispersion compensated optical signal Furthermore, in regards to reflective mirror group, which is used to apply phase shift to each frequency component of an optical signal, each of the respective plurality of reflective mirrorsis made a movable mirror having a movable reflection position that reflects the frequency components. Through this, dispersion that develops in an optical signal may be compensated with favorable controllability and high accuracy. Therefore, the precision and controllability of dispersion compensation will become superior, and realized is a variable dispersion compensator having a miniaturized optical circuit, and an optical transmission system comprising such variable dispersion compensator,

Variable dispersion compensator and optical transmission system

In an optical fiber including a core region and cladding regions of not less than three layers which surrounds the core region in order, each of said cladding regions has a mean refractive index different from those of the adjacents regions,at least one of the cladding regions has a lower mean refractive index than both adjacent regions, and at least one cladding region is provided with a plurality of sub medium regions each having a refractive index lower than a main medium constituting this cladding region.

Microstructured optical fiber

Growing community of inventors

Yokohama, Japan

Masayuki Nishimura