| Patent Number |
Title Of Patent |
Date Issued |
| 6879745 |
Optical switch |
April 12, 2005 |
| An optical switch includes an input side switching element having a plurality of optical input ports and an output side switching element having a plurality of optical output ports. The input side switching element is provided with an input side optical deflection element group consi |
| 6701033 |
Optical switch element and wavelength router |
March 2, 2004 |
| This optical switch element comprises mutually intersecting first and second optical waveguides; a cylindrical-shape optical wave-guiding member near the intersecting part; and a heater to control the refractive index of the optical wave-guiding member. Signal light input to a first inpu |
| 6665467 |
Optical wavelength filter |
December 16, 2003 |
| An optical wavelength filter having an optical coupler, for suppressing the generation of a double peak caused by a difference of propagation constants between intrinsic modes of light in an optical coupler. The optical wavelength filter includes first and second optical couplers for |
| 6657771 |
Optical switch having optical deflector |
December 2, 2003 |
| An optical switch (26) comprises an input switching element (12) having a plurality of light input ports (10) and an output switching element (16) having a plurality of light output ports (14). The input switching element (12) comprises a plurality of input optical deflector sets (20), e |
| 6591036 |
Optical multiplexing/demultiplexing device |
July 8, 2003 |
| An optical multiplexing/demultiplexing device has a structure wherein a curved waveguide for input, linear waveguides for output, and a planar waveguide are provided within a substrate. The curved waveguide is discontinuous, and the curved waveguide and planar waveguide are separated |
| 6574392 |
Wavelength router |
June 3, 2003 |
| The present invention seeks to increase the number of wavelengths capable of being handled while reducing the sub peak and beat noise. A wave router acording to the invention has three acoustooptical filter elements; two wavelength division multiplicity reduction elements; and two wavele |
| 6553164 |
Y-branch waveguide |
April 22, 2003 |
| A Y-branch waveguide includes a single merging side waveguide, two branching waveguides, and a junction area waveguide provided between the merging side waveguide and the branching waveguides and formed in a tapered shape being thicker at the branching than at the merging side. The j |
| 6553162 |
Optical multiplexer-demultiplexer with mutually intersecting sub-gratings |
April 22, 2003 |
| An optical multiplexer-demultiplexer has a diffraction grating formed from a plurality of mutually intersecting sub-gratings. Each sub-grating has a grating vector. The diffraction grating as a whole has a combined high-order grating vector equal to a sum of integer multiples of the |
| 6507690 |
Optical device |
January 14, 2003 |
| A disclosed optical device comprises: at least one input waveguide path; a multi-mode waveguide path; a core layer having a plurality of output waveguide paths; and a clad layer having therein the core layer. The multi-mode waveguide path is formed in an island. In a region including |
| 6496614 |
Light multiplexing wave division device |
December 17, 2002 |
| A curved waveguide and a linear waveguide are formed in a planar waveguide, and the curved waveguide has a discontinuous structure broken by the planar waveguide. A light signal input to the curved waveguide is reflected at a discontinuous surface of the curved waveguide thereof, and |
| 6496613 |
Wavelength router |
December 17, 2002 |
| The wavelength router comprises two flat waveguides, and these flat waveguides are connected by connecting waveguides. In each flat waveguide, optical path converters are created at connecting sections with the connecting waveguides. The optical path converters convert the light prop |
| 6493481 |
Optical switch unit |
December 10, 2002 |
| K.times.K optical switch unit according to the present invention is comprised of input ports 1-1, . . . 1-36, 1.times.M optical matrix switches 5-1-1, . . . 5-4-9 connected with the input ports 1-1, . . . 1-36, N.times.N optical matrix switches 7-1-1, . . . 7-4-2, and 10-1-1, . . . 1 |
| 6470112 |
Lightwave system |
October 22, 2002 |
| A lightwave system comprises an optical signal bus; an input/output interface including a first, a second and a third port, an optical signal inputted to the first port being outputted from the second port, an optical signal inputted to the third port being outputted from the first p |
| 6456764 |
Optical directional coupler |
September 24, 2002 |
| An optical directional coupler includes a first waveguide, a second waveguide and a plurality of bridge waveguides connecting the first waveguide and the second waveguide. |
| 6427037 |
Two-stage optical switch circuit network |
July 30, 2002 |
| An optical switch circuit network includes r input optical switches 102a each having n input ports, m 1.times.r optical switches 125a, and an n.times.m optical switch for switching a path connecting the input ports and the 1.times.r optical switches, and r output optical switches 125 eac |
| 6374018 |
Optical switch, method of operating optical switch, and method of designing optical switch |
April 16, 2002 |
| An optical switch in which operational ranges of both a bar state and a cross state are wide is provided. By applying voltages of +V, -V, -V and+V independently to a first electrode 20A, a second electrode 20B, a third electrode 20C and a fourth electrode 20D, switching control to the ba |
| 6320998 |
Optical switch for selectively connecting an optical input terminal with an optical output termi |
November 20, 2001 |
| An optical switch includes an optical input terminal, a first deflector disposed to receive light from the optical input terminal, controlled to change its deflection angle, second deflectors arranged in a substrate, the first deflector transmits light from the optical input terminal to |
| 6272270 |
Optical wave combining/splitting device |
August 7, 2001 |
| The present invention expands a selective wavelength band and flattens light intensity in the selective wavelength band as good as or better than prior art, and makes power loss less than prior art. The invention as a period characteristic wavelength splitter and an arrayed waveguide |
| 6229943 |
Optical circuit device and wavelength router |
May 8, 2001 |
| A wavelength router has a structure capable of preventing a wavelength shift from occurring and an optical circuit device capable of reducing a phase error. The wavelength router includes three input ports; three input waveguides each having one end connected to the corresponding input p |
| 6215922 |
Lightwave filter and lightwave selective router |
April 10, 2001 |
| A lightwave filter which allows optical signals of a plurality of wavelength channels to be extracted even in the case of high-density multiplexing. It is provided with two rows of gratings, each with two fixed gratings, wherein the reflection wavelength is fixed, and two variable gr |
| 6154587 |
Optical cross connector apparatus |
November 28, 2000 |
| The optical communications system is capable of increasing its scale with the use of a fewer number of wavelengths and is flexible in allowing the topology to be altered. The optical cross connector minimizes optical loss and crosstalk. The optical communications system includes a plural |
| 6097517 |
Wavelength router |
August 1, 2000 |
| A wavelength router has first ports each receiving or providing a first multiwavelength optical signal having wavelengths, and second ports each providing or receiving second multiwavelength optical signals having multiplexed wavelengths. The number of multiplexed wavelengths of the |
| 5973809 |
Multiwavelength optical switch with its multiplicity reduced |
October 26, 1999 |
| A multiwavelength optical switch capable of reducing an amount of internal circuit components to be connected to a plurality of multiwavelength circuit, and thus saving the occupied area of the switch. A wavelength router (11) receives, at M (M=3) input ports (a3, a6 and a9), multiwa |
| 5946129 |
Wavelength conversion apparatus with improved efficiency, easy adjustability, and polarization i |
August 31, 1999 |
| A wavelength conversion apparatus has an optical amplifier, a wavelength converter, and an optical coupler coupled to form an optical ring resonator. The optical amplifier supplies pump light. The wavelength converter generates converted light, either from the pump light alone or by |
| 5786916 |
Optical-wavelength interchanger element and optical-wavelength interchanger device |
July 28, 1998 |
| An optical-wavelength interchanger element includes a branching section for bifurcating a wavelength-multiplexed input light signal having a multiplicity of an even number into first and second light signals. The interchanger element further includes a wavelength converting element for |
| 5734494 |
Wavelength conversion device and wavelength conversion method |
March 31, 1998 |
| A wavelength conversion device includes a wavelength conversion element. The wavelength conversion element includes a ridge waveguide layer made of nonlinear optical crystals as being a zinc-blend material. The waveguide layer is provided on a GaAs substrate made of the zinc-blend materi |
| 5677971 |
Optical wavelength filter with reduced sidelobes and simple design |
October 14, 1997 |
| An optical wavelength filter has a polarizer, an analyzer, and an optical waveguide, formed in a substrate displaying an acousto-optic effect, that guides light from the polarizer to the analyzer. A transducer formed on the substrate excites a surface acoustic wave, thus creating an acou |
| 5636045 |
Photonic switching method and photonic switch utilizing same |
June 3, 1997 |
| A photonic switching method and a photonic switch utilizing the method are disclosed. Input electrical signals Ea.about.Ed are input through plural input ports 21a.about.21d are converted into optical signals with the pulse intervals of these input electrical signals being preserved |
| 5388001 |
Polarization-independent optical wavelength filter with simplified structure |
February 7, 1995 |
| A polarization-independent optical wavelength filter uses a polarization splitter to divide an optical input signal into first and second signals with mutually perpendicular planes of polarization. The first signal propagates via a first optical path to a first end of an optical device, |
| 5189714 |
Optical wavelength filter device |
February 23, 1993 |
| An optical wavelength filter device capable of increasing the number of channels by narrowing a line width and widening a tuning width and comprising a first optical wavelength filter of a mode conversion type and a second optical wavelength filter of an interferometer type optically |
| 5163106 |
Waveguide-type optical switch |
November 10, 1992 |
| A waveguide-type optical switch having a Y-branch structure composed of a Y-waveguide and branched waveguides provided with electrodes for electrically controlling the guide asynchronism thereof characterized in that the branched waveguides arranged at a converging angle of .theta..s |
| 5153934 |
Waveguide-type optical device |
October 6, 1992 |
| A waveguide-type optical device of the invention has a dielectric substrate, wave-guiding paths formed in the dielectric substrate, and electrodes for forming an operation-controlling electric field for the wave-guiding paths. A carrier capture layer is provided in a region into whic |
| 5133028 |
Optical wave-length filter and a driving method thereof |
July 21, 1992 |
| There is provided an optical wave-length filter which is constituted by a wave-guide route formed on a surface of a substrate; a front stage polarizer disposed in the wave-guide route for transmitting as an input light either TM mode light or TE mode light; a plurality of mode-conver |
| 5123069 |
Waveguide-type optical switch |
June 16, 1992 |
| Waveguide-type optical switch comprising a substrate, branched first and second waveguide routes provided thereon, and an electrode(s) provided on the substrate for controlling the propagation-constant difference or refractive index difference between the first and second waveguide route |
| 5086349 |
Optical switching system which employs reference beams with different wavelengths |
February 4, 1992 |
| An optical switching system has an optical transmission path for propagating signal beams, and a plurality of optical nodes for transmitting and receiving the signal beams. A reference beam source generates reference beams each having a particular wavelength. Each optical node genera |
| 5048906 |
Waveguide type photoswitch with a short coupling region |
September 17, 1991 |
| A waveguide type photoswitch has a substrate on which a plurality of waveguide paths are provided in close proximity to each other. Electrodes are arranged along the waveguide paths in a coupling region of the paths. The distance between the waveguide paths is greater at the center of th |
| 4884858 |
Distributed coupler switch |
December 5, 1989 |
| In an electro-optic distributed coupler switch having a parallel rib geometry, a coupling enhancement region formed of the same material as the upper cladding layers but of lower step height is located between the ribs. By increasing the electric field strength, the coupling enhancement |
| 4846542 |
Optical switch matrix |
July 11, 1989 |
| An optical switch matrix for selecting an optical propagation route between input ports and output ports by electric control. A first directional coupler is disposed on the input port side of a crosspoint of the matrix. A second directional coupler is disposed on the output port side of |
