Patents by Inventor Naoki Ooba
Naoki Ooba has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10254625Abstract: An optical signal processing device with a transponder aggregator function by which theoretical loss is not increased even if the number of necessary transponders is increased. Optical signals inputted from input ports are inputted to a PLC. The PLC has SBTs. The input ports are connected to the input-end SBT, and a plane wave is outputted from an output end of the PLC to the space side at an angle different for each input port. Optical signals outputted by the PLC are changed in their optical paths on the x-z plane by a cylindrical lens (Lsp) designed to refract optical signals in the x-axis direction, and are reflected by an LCOS at different regions corresponding to the positions of the input port. The reflected optical signals are incident on the output-end SBTs on the PLC, and are outputted to output ports via demultiplex parts.Type: GrantFiled: April 28, 2016Date of Patent: April 9, 2019Assignee: Nippon Telegraph and Telephone CorporationInventors: Kenya Suzuki, Kei Kuwabara, Yuichi Higuchi, Mitsumasa Nakajima, Yuichiro Ikuma, Osamu Moriwaki, Tetsuo Takahashi, Naoki Ooba, Yuzo Ishii
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Publication number: 20180164656Abstract: The present invention provides an optical signal processing device with a transponder aggregator function by which theoretical loss is not increased even if the number of necessary transponders is increased. Optical signals inputted from input ports are inputted to a PLC. The PLC has SBTs. The input ports are connected to the input-end SBT, and a plane wave is outputted from an output end of the PLC to the space side at an angle different for each input port. Optical signals outputted by the PLC are changed in their optical paths on the x-z plane by a cylindrical lens (Lsp) designed to refract optical signals in the x-axis direction, and are reflected by an LCOS at different regions corresponding to the positions of the input port. The reflected optical signals are incident on the output-end SBTs on the PLC, and are outputted to output ports via demultiplex parts.Type: ApplicationFiled: April 28, 2016Publication date: June 14, 2018Applicant: Nippon Telegraph and Telephone CorporationInventors: Kenya Suzuki, Kei Kuwabara, Yuichi Higuchi, Mitsumasa Nakajima, Yuichiro Ikuma, Osamu Moriwaki, Testsuo Takahashi, Naoki Ooba, Yuzo Ishii
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Patent number: 9723387Abstract: To provide an optical signal processing device that can collect light from an input waveguide to form a beam array having a small diameter. The optical signal processing device includes input waveguides 302a to 302c, an array waveguide 305 and a slab waveguide 304 that is connected to a first arc 304a having the single point C as a center and input waveguides 302a to 302c and that is connected to a second arc 404b having the single point C as a center and an array waveguide 305.Type: GrantFiled: September 27, 2013Date of Patent: August 1, 2017Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kenya Suzuki, Kazunori Seno, Naoki Ooba, Tetsuo Takahashi, Toshio Watanabe, Takeshi Kawai, Mitsunori Fukutoku, Yuzo Ishii, Koichi Hadama, Yuichi Higuchi
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Patent number: 9500811Abstract: Disclosed is an optical circuit including a transparent plate, which is light-transmittable, and a light shielding plate, which is adhered to the transparent plate with an adhesive and has an opening through which incident light passes, and in which the aspect facing to the opening has, on the side opposite to the transparent plate, projections in an overhang shape toward the center of the opening.Type: GrantFiled: September 17, 2013Date of Patent: November 22, 2016Assignees: NTT Electronics Corporation, Nippon Telegraph and Telephone CorporationInventors: Hiroshi Tomita, Kenji Kobayashi, Naoki Ooba, Toru Miura
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Publication number: 20160286288Abstract: An optical switch with a flat transmission property is provided. The optical switch includes an input port, an output port, a diffractive grating configured to perform wavelength demultiplexing on an optical signal from the input port, and LCOS configured to deflect the wavelength-demultiplexed optical signal to the output port. The diffractive grating is pre-arranged such that a shape of the optical signal as entering the LCOS is asymmetric with respect to an axis in the LCOS surface that is orthogonal to a wavelength axis of the diffractive grating.Type: ApplicationFiled: October 28, 2014Publication date: September 29, 2016Inventors: Kenya Suzuki, Kazunori Seno, Yuzo Ishii, Koichi Hadama, Naoki Ooba
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Patent number: 9307301Abstract: The discloser provides a multi-input and multi-output optical switch capable of switching over all WDM wavelengths. An optical switch according to one embodiment includes: an optical demultiplexing element (3) that demultiplexes an optical signal from at least one input port into individual wavelengths; a first optical deflection element (5), which deflects an incident optical signal, that deflects the wavelength-separated optical signal incoming from the optical demultiplexing element to change a traveling direction for each wavelength to a switch axis direction perpendicular to a wavelength dispersion axis direction; a second optical deflection element (8) that deflects the optical signal incoming from the first optical deflection element to change the traveling direction to the switch axis direction for output to at least one of the output ports; and an optical multiplexing element (10) that multiplexes the optical signal with the different wavelengths incoming from the second optical deflection element.Type: GrantFiled: September 14, 2012Date of Patent: April 5, 2016Assignee: Nippon Telegraph and Telephone CorporationInventors: Kenya Suzuki, Kazunori Seno, Naoki Ooba, Toshio Watanabe, Tetsuo Takahashi
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Patent number: 9201194Abstract: Provided is an optical module capable of inhibiting both the displacement of an optical axis caused by thermal changes and property degradation in an optical functional circuit. The optical module includes: a planar lightwave circuit including a waveguide-type optical functional circuit and a waveguide region where only an optical waveguide is formed in contact with a side, wherein an emission end face where output light is emitted from the optical functional circuit, or an entrance end face where input light is entered to the optical functional circuit is formed in contact with the side; a fixing mount employed to hold the planar lightwave circuit only in the portion where the waveguide area is located; and an auxiliary mount employed to hold the planar lightwave circuit in contact with a side that is opposite the side where the emission end face or the entrance end face.Type: GrantFiled: January 7, 2014Date of Patent: December 1, 2015Assignees: NTT Electronics Corporation, Nippon Telegraph and Telephone CorporationInventors: Naoki Ooba, Hiroshi Tomita, Kenji Kobayashi, Yuko Kawajiri, Kenya Suzuki
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Publication number: 20150247970Abstract: Disclosed is an optical circuit including a transparent plate, which is light-transmittable, and a light shielding plate, which is adhered to the transparent plate with an adhesive and has an opening through which incident light passes, and in which the aspect facing to the opening has, on the side opposite to the transparent plate, projections in an overhang shape toward the center of the opening.Type: ApplicationFiled: September 17, 2013Publication date: September 3, 2015Applicants: NTT ELECTRONICS CORPORATION, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hiroshi Tomita, Kenji Kobayashi, Naoki Ooba, Toru Miura
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Publication number: 20150237420Abstract: To provide an optical signal processing device that can collect light from an input waveguide to form a beam array having a small diameter. The optical signal processing device includes input waveguides 302a to 302c, an array waveguide 305 and a slab waveguide 304 that is connected to a first arc 304a having the single point C as a center and input waveguides 302a to 302c and that is connected to a second arc 404b having the single point C as a center and an array waveguide 305.Type: ApplicationFiled: September 27, 2013Publication date: August 20, 2015Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kenya Suzuki, Kazunori Seno, Naoki Ooba, Tetsuo Takahashi, Toshio Watanabe, Takeshi Kawai, Mitsunori Fukutoku, Yuzo Ishii, Koichi Hadama, Yuichi Higuchi
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Patent number: 9036958Abstract: In an optical component, a part of a waveguide type optical device is fixed to a convex portion of a mount. The optical component includes an optical device support base, a pressure member and a pressure support base. The optical device support base is interposed between the mount and the presser member enough to be slidable in a direction parallel to surfaces of the mount and the presser member.Type: GrantFiled: March 9, 2011Date of Patent: May 19, 2015Assignees: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, NTT ELECTRONICS CORPORATIONInventors: Motohaya Ishii, Naoki Ooba, Kazunori Seno, Yoshiyuki Doi, Ken Tsuzuki, Takao Fukumitsu, Atsushi Murasawa, Fumihiro Ebisawa, Hiroshi Terui, Tomoyo Shibazaki, Yuichi Kikuchi
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Patent number: 8983252Abstract: Conventionally, there has been a problem that a structure in which optical signals outputting from a substrate facet in a PLC are optically coupled to a different bulk type optical device is so complicated that its assembly is laborious. There also has been a problem that a structure in which an output facet of a PLC is polished with an angle results in an increase in coupling loss in free space optics. With a lens bonded to an angled facet of a PLC, an optical circuit of the present invention achieves an optical coupling, with low loss, to a bulk-type optical device or another PLC with a simple structure. Moreover, a lens part and an optical fiber part are respectively bonded to different core apertures exposed on a single angled facet. Thereby, optical signals can be inputted to and outputted from the PLC through the single facet.Type: GrantFiled: November 14, 2008Date of Patent: March 17, 2015Assignee: Nippon Telegraph and Telephone CorporationInventors: Motohaya Ishii, Naoki Ooba, Kenya Suzuki, Shinji Mino
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Publication number: 20140205291Abstract: The discloser provides a multi-input and multi-output optical switch capable of switching over all WDM wavelengths. An optical switch according to one embodiment includes: an optical demultiplexing element (3) that demultiplexes an optical signal from at least one input port into individual wavelengths; a first optical deflection element (5), which deflects an incident optical signal, that deflects the wavelength-separated optical signal incoming from the optical demultiplexing element to change a traveling direction for each wavelength to a switch axis direction perpendicular to a wavelength dispersion axis direction; a second optical deflection element (8) that deflects the optical signal incoming from the first optical deflection element to change the traveling direction to the switch axis direction for output to at least one of the output ports; and an optical multiplexing element (10) that multiplexes the optical signal with the different wavelengths incoming from the second optical deflection element.Type: ApplicationFiled: September 14, 2012Publication date: July 24, 2014Inventors: Kenya Suzuki, Kazunori Seno, Naoki Ooba, Toshio Watanabe, Tetsuo Takahashi
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Publication number: 20140193114Abstract: Provided is an optical module capable of inhibiting both the displacement of an optical axis caused by thermal changes and property degradation in an optical functional circuit. The optical module includes: a planar lightwave circuit including a waveguide-type optical functional circuit and a waveguide region where only an optical waveguide is formed in contact with a side, wherein an emission end face where output light is emitted from the optical functional circuit, or an entrance end face where input light is entered to the optical functional circuit is formed in contact with the side; a fixing mount employed to hold the planar lightwave circuit only in the portion where the waveguide area is located; and an auxiliary mount employed to hold the planar lightwave circuit in contact with a side that is opposite the side where the emission end face or the entrance end face.Type: ApplicationFiled: January 7, 2014Publication date: July 10, 2014Inventors: Naoki Ooba, Hiroshi Tomita, Kenji Kobayashi, Yuko Kawajiri, Kenya Suzuki
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Publication number: 20130011095Abstract: In an optical component, a part of a waveguide type optical device is fixed to a convex portion of a mount. The optical component includes an optical support base, a pressure member and a pressure support base. The optical device support base is interposed between the mount and the presser member enough to be slidable in a direction parallel to surfaces of the mount and the presser member.Type: ApplicationFiled: March 9, 2011Publication date: January 10, 2013Applicants: NTT ELECTRONICS CORPORATION, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Motohaya Ishii, Naoki Ooba, Kazunori Seno, Yoshiyuki Doi, Ken Tsuzuki, Takao Fukumitsu, Atsushi Murasawa, Fumihiro Ebisawa, Hiroshi Terui, Tomoyo Shibazaki, Yuichi Kikuchi
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Patent number: 8346086Abstract: A conventional optical signal processing device had a disadvantage where the temperature dependency of the spectroscopic characteristics of a spectroscopic element causes a deteriorated performance. In order to solve the temperature dependency, there has been a method to form a plurality of grooves for dividing a core on the array waveguide of the AWG. However, this method cannot avoid an excess loss and causes a high manufacture cost. By directly controlling the modulation characteristic profile formed by an element device of a spatial light modulator, athermalization can be achieved in a simpler and low-cost manner. This consequently provides a remarkable reduction of the light coupling loss in the spatial optical system of the optical signal processing device. More accurate temperature compensation can be realized that copes with an actual behavior of the device to a temperature fluctuation, including causing factors of a complicated temperature fluctuation of the optical system.Type: GrantFiled: February 20, 2009Date of Patent: January 1, 2013Assignee: Nippon Telegraph and Telephone CorporationInventors: Kenya Suzuki, Naoki Ooba, Motohaya Ishii, Shinji Mino, Kazunori Seno
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Patent number: 8260139Abstract: Conventional dispersion compensators were not sufficient to satisfy a demand to set a different dispersion value for each WDM wavelength in a ring-mesh type network that utilizes wavelength selective switches or the like. The devices were insufficiently reduced in size and power consumption and used with difficulty to change dispersion characteristics for each wavelength flexibly in a simple manner. A dispersion compensator of the present invention uses general-purpose optical components including a spatial light modulator for providing discrete phases to set appropriately the relationship between the focusing beam radius and the spatial light modulator pixel, thereby providing various dispersion compensation characteristics.Type: GrantFiled: June 25, 2008Date of Patent: September 4, 2012Assignee: Nippon Telegraph & Telephone Corp.Inventors: Kenya Suzuki, Kazunori Seno, Naoki Ooba, Shinji Mino, Motohaya Ishii
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Patent number: 8204347Abstract: In a conventional optical signal processing device, a confocal optical system is configured in which a focusing lens is positioned at a substantially-intermediate point of a free space optical path. Thus, the free space optical system had a long length. It has been difficult to reduce the size of the entire device. The optical signal processing device of the present invention uses a lens layout configuration different from the confocal optical system to thereby significantly reduce the length of the system. The optical signal processing device consists of the first focusing lens positioned in the close vicinity of a signal processing device, and the second focusing lens positioned in the vicinity of a dispersing element. A distance between the dispersing element and the signal processing device is approximately a focal length of the first focusing lens. Compared with the conventional technique, the length of the optical path can be halved.Type: GrantFiled: August 21, 2008Date of Patent: June 19, 2012Assignee: Nippon Telegraph and Telephone CorporationInventors: Naoki Ooba, Kenya Suzuki, Motohaya Ishii, Shinji Mino, Atsushi Aratake
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Publication number: 20110228374Abstract: In a conventional optical signal processing device, a confocal optical system is configured in which a focusing lens is positioned at a substantially-intermediate point of a free space optical path. Thus, the free space optical system had a long length. It has been difficult to reduce the size of the entire device. The optical signal processing device of the present invention uses a lens layout configuration different from the confocal optical system to thereby significantly reduce the length of the system. The optical signal processing device consists of the first focusing lens positioned in the close vicinity of a signal processing device, and the second focusing lens positioned in the vicinity of a dispersing element. A distance between the dispersing element and the signal processing device is approximately a focal length of the first focusing lens. Compared with the conventional technique, the length of the optical path can be halved.Type: ApplicationFiled: August 21, 2008Publication date: September 22, 2011Applicant: Nippon Telegraph and Telephone CorporationInventors: Naoki Ooba, Kenya Suzuki, Motohaya Ishii, Shinji Mino, Atsushi Aratake
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Publication number: 20100316385Abstract: A conventional optical signal processing device had a disadvantage where the temperature dependency of the spectroscopic characteristics of a spectroscopic element causes a deteriorated performance. In order to solve the temperature dependency, there has been a method to form a plurality of grooves for dividing a core on the array waveguide of the AWG. However, this method cannot avoid an excess loss and causes a high manufacture cost. By directly controlling the modulation characteristic profile formed by an element device of a spatial light modulator, athermalization can be achieved in a simpler and low-cost manner. This consequently provides a remarkable reduction of the light coupling loss in the spatial optical system of the optical signal processing device. More accurate temperature compensation can be realized that copes with an actual behavior of the device to a temperature fluctuation, including causing factors of a complicated temperature fluctuation of the optical system.Type: ApplicationFiled: February 20, 2009Publication date: December 16, 2010Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kenya Suzuki, Naoki Ooba, Motohaya Ishii, Shinji Mino, Kazunori Seno
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Publication number: 20100296776Abstract: Conventionally, there has been a problem that a structure in which optical signals outputting from a substrate facet in a PLC are optically coupled to a different bulk type optical device is so complicated that its assembly is laborious. There also has been a problem that a structure in which an output facet of a PLC is polished with an angle results in an increase in coupling loss in free space optics. With a lens bonded to an angled facet of a PLC, an optical circuit of the present invention achieves an optical coupling, with low loss, to a bulk-type optical device or another PLC with a simple structure. Moreover, a lens part and an optical fiber part are respectively bonded to different core apertures exposed on a single angled facet. Thereby, optical signals can be inputted to and outputted from the PLC through the single facet.Type: ApplicationFiled: November 14, 2008Publication date: November 25, 2010Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Motohaya Ishii, Naoki Ooba, Kenya Suzuki, Shinji Mino