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| Number | Title | Issue Date |
| 7333261 | Magnetic garnet material, faraday rotator, optical device, bismuth-substituted rare earth-iron-garnet single-crystal film and method for producing the same crucible for producing the same A of producing a magnetic garnet material of which the light absorption characteristics worsen little even though it is produced through LPE. The crucible for LPE is formed of a material containing Au. The amount of Au to be taken in single crystal formed in an Au c... | 02/19/2008 |
| 7242516 | Hard magnetic garnet material, faraday rotator, optical device, optical communication system, method of manufacturing faraday rotator and method of manufacturing bismuth-substituted rare earth iron garnet single crystal A hard magnetic Bi-substituted rare earth iron garnet material with excellent Faraday rotary moment, temperature property, wavelength property and insertion loss is provided. A Bi-substituted rare earth iron garnet material having a chemical composition of (Bi3... | 07/10/2007 |
| 7211455 | Method for manufacturing semiconductor module A method for manufacturing a semiconductor module incorporated with an optical isolator making use of a Faraday rotator formed of a magnetic garnet film in which a magnetically saturated condition is maintained even without any external magnetic field, in which, at ... | 05/01/2007 |
| 7187496 | Manufacturing method of optical device, optical device, manufacturing method of faraday rotator, and optical communication system There are provided a manufacturing method of an optical device excellent in expediency, and a technique for stably manufacturing a high performance optical device. After a single crystal film which constitutes a Faraday rotator and can exhibit a substantially rectan... | 03/06/2007 |
| 7170921 | Magneto-optic variable optical attenuator A magneto-optic variable optical attenuator is provided that is used to control the intensity of a light signal. The optical attenuator includes at least one polarizing element having an optical polarization axis, wherein the polarizing element transmits a portion o... | 01/30/2007 |
| 7133189 | Magnetic garnet material, faraday rotator, optical device, bismuth-substituted rare earth-iron-garnet single-crystal film and method for producing the same and crucible for producing the same Proposed is a technique of producing a magnetic garnet material of which the light absorption characteristics worsen little even though it is produced through LPE. The crucible for LPE is formed of a material containing Au. The amount of Au to be taken in single cry... | 11/07/2006 |
| 7095559 | Variable optical delay circuit In a variable optical delay circuit to be used for compensation for polarization mode dispersion of an optical signal and for other purposes, there are provided a first birefringent member, a second birefringent member and a variable optical rotator interposed betwe... | 08/22/2006 |
| 7050231 | Faraday rotator with metal reflection film A Faraday rotator of multilayer film type is provided which can achieve excellent optical characteristics with a reduced number of layers. In the Faraday rotator, a metal reflection film, a periodic dielectric multilayer film made of silicon dioxide SiO2 ... | 05/23/2006 |
| 7024073 | Reflective variable light attenuator A reflection-type variable optical attenuator comprises: a main attenuator unit including a first birefringent crystal plate, a Faraday rotational angle varying unit, and a second birefringent crystal plate arranged in this order; an input port and an output port th... | 04/04/2006 |
| 7016094 | Nonvolatile solid state electro-optic modulator Perovskite materials having magnetoresistive effect under the influence of an electric field can be employed in the construction of nonvolatile solid state electro-optic modulator. These materials display nonvolatile changes in electrical resistance and reactant whe... | 03/21/2006 |
| 7002732 | Magneto-optical devices The invention provides small-sized, power-saving and easily-producible magneto-optical devices. The magneto-optical device comprises a Faraday rotator having nearly parallel surfaces and a Z-direction magnetic easy axis; a total reflection film formed partly on one ... | 02/21/2006 |
| 6952300 | Magneto-photonic crystal isolators A magneto-optical isolator (20) for an optical circuit. The isolator includes a substrate, and an optical channel (350) disposed next to the substrate. The optical channel and substrate are configured to transmit optical radiation within the optical ch... | 10/04/2005 |
| 6853473 | Faraday rotator and optical device comprising the same, and antireflection film and optical device comprising the same The invention relates to an optical device for polarizing light by changing its Faraday rotation angle, such as optical attenuators, optical switches or polarization controllers; and its object is to provide such an optical device which can be driven even by small-s... | 02/08/2005 |
| 6816300 | Optical apparatus An optical device includes a Faraday rotator made of a bismuth substituted rare earth iron garnet single crystal (BIG) having a Faraday rotation of 45 degrees, and permanent magnets arranged beside the Faraday rotator to define two or more areas of a single domain s... | 11/09/2004 |
| 6785037 | Faraday rotator A Faraday rotator of multilayer film type is provided in which satisfactory optical characteristics are obtained with a small number of layers. In the Faraday rotator, a first periodic dielectric multilayer film made of silicon dioxide SiO2 and tantalum p... | 08/31/2004 |
| 6775052 | HARD MAGNETIC GARNET MATERIAL, FARADAY ROTATOR, OPTICAL DEVICE, OPTICAL COMMUNICATION SYSTEM, METHOD OF MANUFACTURING FARADAY ROTATOR AND METHOD OF MANUFACTURING BISMUTH-SUBSTITUTED RARE EARTH IRON GARNET SINGLE CRYSTAL A hard magnetic Bi-substituted rare earth iron garnet material with excellent Faraday rotary moment, temperature property, wavelength property and insertion loss is provided. A Bi-substituted rare earth iron garnet material having a chemical composition of (Bi3... | 08/10/2004 |
| 6770223 | Article comprising a faraday rotator that does not require a bias magnet Faraday rotator garnet thick films have improved specific Faraday rotations without requiring a bias magnet. Films of nominal composition BiX(EuZHo1-Z)3-XFe5-YGaYO12 are grown lattice match... | 08/03/2004 |
| 6673146 | Method of manufacturing a magnet-free faraday rotator A method of manufacturing is used to manufacture a magnet-free Faraday rotator having a square hysteresis loop, the Faraday rotator being formed of a bismuth-substituted rare earth iron garnet single crystal that has a compensation temperature in the rang... | 01/06/2004 |
| 6661560 | Magneto-optical modulator for superconducting digital interface A magneto-optic modulator modulates signals from a superconducting circuit such as a single-flux-quantum (SFQ) logic system onto a carrier wave light beam. The modulator is formed by depositing a magneto-optic material such as EuSe onto a superconducting ... | 12/09/2003 |
| 6661935 | Optical signal processing apparatus and method An optical signal processing apparatus includes a YIG monocrystal serving as a magnetic body. A microstrip is provided on one main face of the YIG monocrystal, and microwaves are input to the microstrip. In order to input a laser beam into the YIG monocry... | 12/09/2003 |
| 6646783 | Light modulation device and filter device A light modulation device comprises: a magnetic garnet single crystal having a main surface and an easy magnetization axis in parallel with the main surface; an optical source arranged such that light emitted from the optical source is introduced into the... | 11/11/2003 |
| 6646777 | Optical isolator with improved mounting characteristics An optical isolator includes a first magnetic polar source having a first magnet axis, a second magnetic polar source having a second magnet axis parallel to the first magnet axis, and an optical element between the first and second magnetic polar sources... | 11/11/2003 |
| 6594068 | High switching speed digital faraday rotator device and optical switches containing the same In all-optical networks, high speed optical switching and routing becomes one of the most important issues for interconnecting the transport network layers. This invention describes novel polarization-independent high speed optical switches using a digita... | 07/15/2003 |
| 6590694 | Faraday rotator A Faraday rotator is provided which obtains excellent optical characteristics with a small number of layers. In the Faraday rotator, a metal reflective film is formed on a substrate, then a first periodic dielectric multilayer film made of silicon dioxide... | 07/08/2003 |
| 6577430 | Bi-directional optical switch The present invention provides improved optical switches in which no mechanical movement is required to direct optical pathways between plural fiber ports and light transmission is bi-directional. Advantageously, the inventive switches permit bi-direction... | 06/10/2003 |
| 6515789 | Compact optical assembly systems and devices for use in optical communication networks The present invention is directed to an optical assembly with a substrate. A non-latching optical component is attached to the substrate and includes a non-latching garnet and a permanent magnet in magnetic communication with the garnet. Also, a latching ... | 02/04/2003 |
| 6462857 | Optical modulator and optical modulation method An optical modulator includes a magnetic ferrite single crystal, an optical source, a photoreceptor system and an analyzer. The magnetic ferrite single crystal has a transducer mounted and arranged to receive a microwave. The microwave is modulated by a s... | 10/08/2002 |
| 6417952 | Faraday rotation angle varying device There is provided a Faraday rotation angle varying device in which external magnetic fields are applied from at least two directions to a garnet single crystal having a Faraday effect and a synthesized magnetic field is varied so that Faraday rotation ang... | 07/09/2002 |
| 6392784 | Faraday rotator An object of the invention is to provide a small size Faraday rotator which is easy to produce and enables reliable reduction of temperature dependence of the Faraday rotation angle, by defining the crystal orientation and arrangement order of each Farada... | 05/21/2002 |
| 6351331 | Faraday rotator and magneto-optical element using the same A Faraday rotator whose Faraday's rotational angle has low temperature-dependency; a method for efficiently preparing the same; a magneto-optical element which makes use of the Faraday rotator and whose characteristic properties are not susceptive to temp... | 02/26/2002 |
| 6345142 | Optical attenuation device having different type magneto-optical optical attenuation elements cascaded together An optical attenuation device to attenuate the intensity of incident light, comprising an optical attenuation unit including at least two different type magneto-optical optical attenuation elements coupled in a cascade together.... | 02/05/2002 |
| 6333809 | Magneto-optical element A magneto-optical device using a rare earth iron garnet material, wherein the rare earth garnet material is expressed in the following formula: (Bix Gdy Rz Y3-x-y-z)(Fe5-w Gaw)O12, wherein... | 12/25/2001 |
| 6333806 | Variable optical attenuator which applies a magnetic field to a Faraday element to rotate the polarization of a light signal An apparatus which attenuates a light signal polarized in a first direction. The apparatus includes a polarization rotation unit and an output unit. The polarization rotation unit rotates the polarization of the light signal to produce a polarization rota... | 12/25/2001 |
| 6317250 | Optical isolator using multiple core fibers A method and apparatus for optically isolating multiple core optical fibers while at the same time substantially reducing polarization mode dispersion, is disclosed. A multiple core fiber is optically coupled to optical birefringent elements, reciprocal a... | 11/13/2001 |
| 6226116 | Magnetic micro-shutters A spatial light modulation device is formed by creating at least one movable element, fixedly attached to the substrate at a first end, from a soft magnetic material with an anisotropic stress created within the movable element such that the element exist... | 05/01/2001 |
| 6198567 | Faraday rotation variable attenuator A variable optical attenuator comprises a Faraday rotator including a ferromagnetic garnet film disposed input/output single mode optical signal paths. A collimating/lensing arrangement is used to focus the optical signal between the input/output signal p... | 03/06/2001 |
| 6094293 | Optical switching apparatus for use in an optical communication system An optical switch includes a light emitter for emitting light and light receivers. A reflector is used for changing a path of light emitted from the light emitter. The reflector is held by a permanent magnet having first and second magnetic poles of oppos... | 07/25/2000 |
| 6031654 | Low magnet-saturation bismuth-substituted rare-earth iron garnet single crystal film A low magnetic saturation type bismuth-substituted rare-earth iron garnet crystal film of the invention is grown on a substrate of (111) garnet single crystal (GdCa)3(GaMgZr)5O12 by using a liquid phase epitaxial method. This single crystal has a lattice ... | 02/29/2000 |
| 5978135 | Article comprising a variable optical attenuator In an arrangement substantially like an optical isolator, appropriate choice of the composition of the magneto-optic element can result in a variable optical attenuator. The composition is selected to vary in the direction of light propagation, and also i... | 11/02/1999 |
| 5973821 | Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of light signal An apparatus which attenuates a light signal polarized in a first direction. The apparatus includes a polarization rotation unit and an output unit. The polarization rotation unit rotates the polarization of the light signal to produce a polarization rota... | 10/26/1999 |
