Patent application number | Description | Published |
20100002989 | POLARIZATION ROTATOR AND METHOD FOR MANUFACTURING THE SAME - An optical circuit comprises a first waveguide; a second waveguide; and a third waveguide that converts mode field and direction of polarization of light of said first waveguide at the same time to perform wave guiding to said second waveguide; wherein large aspect ratio directions of corresponding ends of a core of said first waveguide and a core of said second waveguide differ from each other. | 01-07-2010 |
20100014821 | OPTICAL CONTROL DEVICE - There is provided an optical control device including a plurality of line-defect waveguides provided in a photonic crystal; each line-defect waveguide including a multiplicity of dielectric pillars with a finite height arranged at lattice points of a two-dimensional Bravais lattice. The optical control device comprises: a first line-defect waveguide; a second line-defect waveguide provided with the dielectric pillars having a thickness different from that of the dielectric pillars of the first line-defect waveguide; and a third line-defect waveguide arranged between the first and second line-defect waveguides and provided with the dielectric pillars whose thicknesses are gradually varied from those of the dielectric pillars of the first line-defect waveguide to those of the dielectric pillars of the second line-defect waveguide along a wave guiding direction. | 01-21-2010 |
20100067846 | OPTICAL CONVERTER AND METHOD FOR MANUFACTURING THE SAME - An optical converter comprises: a first waveguide, a second waveguide, and a tapered waveguide arranged between both the waveguides, wherein heights of a core of the first waveguide and a core of the second waveguide are different; both ends in a direction of wave guiding of a core of the tapered waveguide are respectively connected to the core of the first waveguide and the core of the second waveguide; cross-sectional shapes and refractive indexes of cores of two waveguides that are connected change continuously or in a stepwise manner at each connection part; and a cross-sectional shape and refractive index of the core of the tapered waveguide change continuously or in a stepwise manner along a direction of wave guiding. | 03-18-2010 |
20100226609 | WAVEGUIDE COUPLING STRUCTURE - A coupling structure of waveguide including a line defect (LD) waveguide portion having an LD waveguide, an electromagnetic field distribution matching portion (EFDMP) connected between the LD waveguide portion and a first tapered portion, the first tapered portion connected with the EFDMP, and a thin line waveguide portion connected with the first tapered portion and having a thin line waveguide. The EFDMP has a matching portion LD as the LD of a columnar photonic crystal, and the matching portion LD is connected with the LD waveguide. The first tapered portion consists of a first thin wire core, and the first LD of a columnar photonic crystal arranged along at least one side of first thin line core. At least one of the first thin line core and the first LD is connected with the matching portion line defect. The thin line waveguide is connected with the first thin line core. | 09-09-2010 |
20100278487 | PHOTONIC CRYSTAL ELEMENT - A waveguide stub is connected to a pillar-type square-lattice photonic crystal waveguide. Within the waveguide stub, the diameter of a defect is made larger than that of the original photonic crystal waveguide thereby reducing the group velocity of a guided light. The original waveguide and the waveguide stub are smoothly connected via a taper waveguide. Because of low group velocity of light in the waveguide stub, free spectral range (FSR) decreases thereby allowing the size of the waveguide stub to be reduced. | 11-04-2010 |
20110002581 | OPTICAL SWITCH AND METHOD OF MANUFACTURING THE SAME - Provided is an optical switch that can be operated efficiently and a method of manufacturing the same. The optical switch according to the present invention is an optical switch of Mach-Zehnder interferometer type formed by a line-defect waveguide of a photonic crystal. Further, the optical switch includes a branch | 01-06-2011 |
20110008000 | OPTICAL SWITCH AND MANUFACTURING METHOD THEREOF - The object is to provide an optical switch capable of efficient operation and a manufacturing method thereof. The optical switch according to the present invention is a Mach-Zehnder interferometer type optical switch composed of a line defect waveguide of a photonic crystal. Further, the optical switch according to the present invention includes two directional couplers | 01-13-2011 |
20110008009 | OPTICAL WAVEGUIDE - In an exemplary embodiment, an optical waveguide ( | 01-13-2011 |
20110255826 | OPTICAL SWITCH - An optical switch is constituted of a wavelength filter and a control device. The wavelength filter includes a first waveguide exhibiting a transmission band of a predetermined basic mode and a second waveguide, arranged in at least one location of the first waveguide, exhibiting a transmission band with a cutoff frequency corresponding to a finite value included in the transmission band of the basic mode. A pair of optical couplers constituting a Mach-Zehnder interferometer is connected to opposite ends of a filter unit including the first waveguide and the second waveguide. When a plurality of wavelength filters is cascaded, these wavelength filters differ from each other in terms of the cutoff frequency of the second waveguide. The control device changes the cutoff frequency of the second waveguide within the transmission band of the first waveguide, thus adjusting the filtering band of the wavelength filter. | 10-20-2011 |
20110293217 | WAVELENGTH FILTER - A wavelength filter includes a first waveguide with a transmission band of a predetermined basic mode and a second waveguide, arranged in at least one location of the first waveguide, with a transmission band whose cutoff frequency corresponds to a finite value included in the transmission band of the basic mode. A pair of optical couplers constituting a Mach-Zehnder interferometer is connected to the opposite ends of a filter unit including the first waveguide and the second waveguide. When a plurality of wavelength filters is cascaded, the wavelength filters can be each varied in terms of the cutoff frequency of the second waveguide. | 12-01-2011 |
20120195565 | OPTICAL CONTROL DEVICE - Disclosed is an optical delay element that makes use of a line-defect waveguide of a photonic crystal, in which long optical delay time and small group speed dispersion are rendered compatible with each other and in which waveform distortion that might otherwise be produced in processing an ultra-high speed signal is eliminated. Two line-defect waveguides 5 and 11, having different pillar diameters and group velocity dispersions of opposite signs, are interconnected by a line-defect waveguide 8, the pillar diameters of which are gradually varied from one 5 of the line-defect waveguides to the other line-defect waveguide 11, such as to compensate for group speed dispersion as well as to maintain an optical delay effect. | 08-02-2012 |